Method for displaying a vascular wall shear index and an ultrasound imaging system

Abstract

The application provides a method for displaying a vascular wall shear index, comprising: emitting ultrasonic waves to a measured tissue containing a blood vessel through a probe, and generating ultrasonic echo data after receiving ultrasonic echoes returned by the measured tissue; obtaining an ultrasonic image containing the blood vessel based on the ultrasonic echo data, determining a blood vessel wall of the blood vessel, and determining one or more to-be-measured positions on the blood vessel wall in the ultrasonic image; obtaining a shear index at each to-be-measured position within a preset time based on the ultrasonic echo data; and displaying corresponding mark information at the to-be-measured position according to the relationship between the shear index at the to-be-measured position and a preset index standard. The application also provides an ultrasonic imaging system and a computer readable storage medium. The application can intuitively indicate normal, abnormal and other states of the shear index.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ultrasound, and in particular to a blood vessel wall shear index display method and an ultrasound imaging system. BACKGROUND

[0002] The blood vessel wall shear index, such as the WSS (Wall Shear Stress), is a widely recognized hemodynamic parameter related to blood vessel lesions in the medical field, such as a clinical parameter related to arteriosclerosis. Generally speaking, a lower WSS is considered to have a tendency to thicken the intima, and a too high WSS also has a risk of causing endothelial tearing or plaque rupture, so that a too high or too low WSS is abnormal. However, in the existing ultrasound instrument, the normal or abnormal WSS measurement value cannot be directly prompted to the user, which may cause the user to miss or fail to timely find the abnormal WSS measurement value. SUMMARY

[0003] Therefore, the present application provides a blood vessel wall shear index display method and an ultrasound imaging system, which can directly prompt the blood vessel wall shear index.

[0004] The blood vessel wall shear index display method disclosed by the present application comprises the following steps: transmitting, by a probe, ultrasonic waves to a measured tissue containing a blood vessel, and generating ultrasonic echo data after receiving ultrasonic echoes returned by the measured tissue; obtaining an ultrasonic image containing the blood vessel based on the ultrasonic echo data, determining a blood vessel wall of the blood vessel, and determining one or more to-be-measured positions on the blood vessel wall in the ultrasonic image; obtaining a shear index at each to-be-measured position within a preset time based on the ultrasonic echo data; and displaying corresponding mark information at the to-be-measured position according to the relationship between the shear index at the to-be-measured position and a preset index standard.

[0005] The ultrasound imaging system disclosed by the present application comprises a probe and a processor. The probe is configured to transmit ultrasonic waves to a measured tissue containing a blood vessel, and generate ultrasonic echo data after receiving ultrasonic echoes returned by the measured tissue; and the processor is connected to the probe and is configured to execute a program stored in a memory to implement a blood vessel wall shear index display method. The blood vessel wall shear index display method comprises the following steps: transmitting, by a probe, ultrasonic waves to a measured tissue containing a blood vessel, and generating ultrasonic echo data after receiving ultrasonic echoes returned by the measured tissue; obtaining an ultrasonic image containing the blood vessel based on the ultrasonic echo data, determining a blood vessel wall of the blood vessel, and determining one or more to-be-measured positions on the blood vessel wall in the ultrasonic image; obtaining a shear index at each to-be-measured position within a preset time based on the ultrasonic echo data; and displaying corresponding mark information at the to-be-measured position according to the relationship between the shear index at the to-be-measured position and a preset index standard.

[0006] A computer readable storage medium, in which computer program instructions are stored, the computer program instructions are used to execute a blood vessel wall shear index display method when called by a processor. The blood vessel wall shear index display method comprises: emitting ultrasonic waves to a measured tissue containing a blood vessel through a probe, and generating ultrasonic echo data after receiving ultrasonic echoes returned by the measured tissue; obtaining an ultrasonic image containing the blood vessel based on the ultrasonic echo data, determining a blood vessel wall of the blood vessel, and determining one or more to-be-measured positions on the blood vessel wall in the ultrasonic image; obtaining a shear index at each to-be-measured position within a preset time based on the ultrasonic echo data; and displaying corresponding mark information at the to-be-measured position according to a relationship between the shear index at the to-be-measured position and a preset index standard.

[0007] In the present application, by displaying mark information for indicating whether the shear index meets the preset index standard at one or more to-be-measured positions, very intuitive indication can be provided to the user, and it is convenient to quickly determine which positions are abnormal or which positions are normal. BRIEF DESCRIPTION OF DRAWINGS

[0008] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0009] Figure 1 It is a schematic diagram of the hardware structure of the ultrasonic imaging system in an embodiment of the present application.

[0010] Figure 2 It is a step flow chart of the blood vessel wall shear index display method in an embodiment of the present application.

[0011] Figure 3 It is a schematic diagram of the measured tissue containing a blood vessel in an embodiment.

[0012] Figure 4 It is a schematic diagram of the step 207 in the method 200 in an embodiment. Figure 2

[0013] Figure 5 It is a schematic diagram of displaying mark information at a to-be-measured position in an embodiment of the present application.

[0014] Figure 6 It is a schematic diagram of displaying mark information at a to-be-measured position in another embodiment of the present application.

[0015] Figure 7 ​A diagram of displaying marker information at a location to be measured in another embodiment of the present application.

[0016] Figure 8 A flowchart of a method of displaying a vessel wall shear index in another embodiment of the present application.

[0017] Figure 9 A diagram of an ultrasound image of a tissue under measurement including a blood vessel in an embodiment of the present application.

[0018] Figure 10 A diagram of an ultrasound image of a tissue under measurement including a blood vessel in another embodiment of the present application.

[0019] Figure 11 A flowchart of a method of displaying a vessel wall shear index in another embodiment of the present application.

[0020] Figure 12 A diagram of an ultrasound image of a tissue under measurement including a blood vessel in another embodiment of the present application.

[0021] Figure 13 A diagram of an ultrasound image of a tissue under measurement including a blood vessel in some embodiments of the present application.

[0022] Figure 14 A block diagram of an ultrasound imaging system in an embodiment of the present application. DETAILED DESCRIPTION

[0023] The description herein makes reference to various exemplary embodiments. However, a person of ordinary skill in the art will recognize that changes and modifications can be made to the exemplary embodiments without departing from the scope of the present application. For example, various operational steps and components for carrying out the operational steps can be implemented in different sequences and / or configurations, and / or implemented using different components and / or means, without departing from the scope of the present application (e.g., one or more steps can be deleted, modified, or combined with other steps).

[0024] The terms "first", "second", and the like, herein do not denote any ordinal, chronological or related meaning, but are used to distinguish a different object. Also, the terms "comprises", "comprising", "includes", "including" and the like, are inclusive of the stated steps or elements but not exclusive of other steps or elements that can be added. For example, a process, method, article, or apparatus that comprises a list of steps or elements is not necessarily limited to the listed steps or elements, but can include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

[0025] Reference will now be made to Figure 1, as shown in the hardware structure schematic diagram of the ultrasound imaging system 100 in an embodiment of the present application. The ultrasound imaging system 100 includes a probe 10, a transmitting circuit 20, a receiving circuit 30, a processor 40, and a display device 50. The receiving circuit 30, the processor 40, and the display device 50 are electrically connected in sequence. The transmitting circuit 20 can excite the probe 10 to emit ultrasonic waves to a target to be measured. The receiving circuit 30 can receive ultrasonic echo returned from the target to be measured through the probe 10, thereby obtaining ultrasonic echo data. The ultrasonic echo data is subjected to beam synthesis processing, signal processing, and imaging processing by the processor 40, so as to obtain an ultrasonic image of the target tissue. The processor 40 is configured to store the ultrasonic image and control the display device 50 to display the ultrasonic image.

[0026] The probe 10 is configured to emit ultrasonic waves to a target to be measured, such as a target tissue containing a blood vessel, and generate ultrasonic echo data after receiving ultrasonic echo returned from the target tissue. The processor 40 is configured to obtain an ultrasonic image containing the blood vessel based on the ultrasonic echo data, determine a blood vessel wall of the blood vessel, and determine one or more to-be-measured positions on the blood vessel wall in the ultrasonic image. The processor 40 is further configured to obtain a shear index at each to-be-measured position within a preset time based on the ultrasonic echo data, and control the display device 50 to display corresponding mark information at the to-be-measured position in the ultrasonic image according to a relationship between the shear index at the to-be-measured position and a preset index standard.

[0027] The processor 40 can be integrated with a beam synthesis module, a signal processing module, and an imaging processing module, so as to realize functions including beam synthesis, signal processing, and imaging processing. In some embodiments, the probe 10 can also be integrated with the transmitting circuit 20 and the receiving circuit 30.

[0028] Please refer to Figure 2 , as shown in the hardware structure schematic diagram of the ultrasound imaging system 100 in an embodiment of the present application. The ultrasound imaging system 100 includes a probe 10, a transmitting circuit 20, a receiving circuit 30, a processor 40, and a display device 50. The receiving circuit 30, the processor 40, and the display device 50 are electrically connected in sequence. The transmitting circuit 20 can excite the probe 10 to emit ultrasonic waves to a target to be measured. The receiving circuit 30 can receive ultrasonic echo returned from the target to be measured through the probe 10, thereby obtaining ultrasonic echo data. The ultrasonic echo data is subjected to beam synthesis processing, signal processing, and imaging processing by the processor 40, so as to obtain an ultrasonic image of the target tissue. The processor 40 is configured to store the ultrasonic image and control the display device 50 to display the ultrasonic image.

[0029] Step 201: Emit ultrasonic waves to a target tissue containing a blood vessel through a probe, and generate ultrasonic echo data after receiving ultrasonic echo returned from the target tissue.

[0030] In this embodiment, the transmitting circuit 20 can transmit ultrasonic waves to the subject tissue containing the blood vessel of the subject through the probe 10 to obtain the ultrasonic echo signals of the subject tissue. After a certain delay, the probe 10 can receive the ultrasonic echo reflected from the subject tissue with the information of the detection object. The probe 10 can include a linear array transducer or a matrix array transducer, the probe 10 with the linear array transducer can obtain two-dimensional ultrasonic echo data, such as a linear array probe; the probe 10 with the linear array transducer can also obtain three-dimensional ultrasonic echo data, such as a convex array probe with a motor; and the probe 10 with the matrix array transducer can obtain three-dimensional ultrasonic echo data (or three-dimensional volume data), such as a two-dimensional array probe.

[0031] After the probe 10 obtains the two-dimensional or three-dimensional ultrasonic echo signals of the subject tissue of the subject, the probe 10 can convert the ultrasonic echo into an electrical signal. The receiving circuit 30 receives the electrical signal converted and generated by the probe 10 to obtain the ultrasonic echo data.

[0032] Step 203: obtaining an ultrasonic image containing the blood vessel based on the ultrasonic echo data, determining the blood vessel wall of the blood vessel, and determining one or more to-be-measured positions on the blood vessel wall of the blood vessel in the ultrasonic image.

[0033] In this embodiment, after the receiving circuit 30 obtains the ultrasonic echo data, the receiving circuit 30 sends the ultrasonic echo data to the beamforming module in the processor 40. The beamforming module performs focusing delay, weighting, and channel summation on the ultrasonic echo data, and then sends the ultrasonic echo data after beamforming to the signal processing module for relevant signal processing. The ultrasonic echo data processed by the signal processing module is sent to the imaging processing module, which performs different processing on the ultrasonic echo data according to different imaging modes required by the user to obtain tissue image data in different modes. Then, the processor 40 performs logarithmic compression, dynamic range adjustment, digital scan conversion, and other processing on the tissue image data in different modes to form ultrasonic tissue images in different modes, and controls the display of the ultrasonic tissue images in different modes on the display device 50. The ultrasonic tissue images in different modes can include M images, B images, C images, and the like.

[0034] Please refer to Figure 3 for a schematic diagram of the subject tissue containing the blood vessel in an embodiment. In some embodiments, the above-mentioned "determining the blood vessel wall of the blood vessel" can include: finding a region with a brightness higher than a preset brightness threshold in the ultrasonic image, and determining the region with the brightness higher than the preset brightness threshold as the blood vessel wall.

[0035] As Figure 3As shown, in the ultrasound image, the brightness of the blood vessel wall B1 is obviously higher than the brightness of the blood flow L1 in the blood vessel and the tissue Z1 around the blood vessel, so that the region with brightness higher than a preset brightness threshold in the ultrasound image can be determined as the blood vessel wall. The preset brightness threshold can be a brightness value higher than the brightness of the blood flow L1 in the blood vessel and the tissue Z1 around the blood vessel and lower than the brightness of the blood vessel wall B1.

[0036] In some embodiments, the method for determining the blood vessel wall of the blood vessel can further include: calculating the blood flow energy of the measured tissue position; finding the edge of the blood flow energy; and determining the region with brightness higher than the preset brightness threshold and at the edge of the blood flow energy in the ultrasound image as the blood vessel wall.

[0037] In some embodiments, the method for determining the blood vessel wall of the blood vessel can further include: calculating the blood flow energy of the measured tissue position; finding the edge of the blood flow energy; and determining the region with brightness higher than the preset brightness threshold and at the edge of the blood flow energy in the ultrasound image as the blood vessel wall.

[0038] In some embodiments, the method for determining the blood vessel wall of the blood vessel can further include: calculating the blood flow energy of the measured tissue position; finding the edge of the blood flow energy; and determining the region with brightness higher than the preset brightness threshold and at the edge of the blood flow energy in the ultrasound image as the blood vessel wall.

[0039] For example, in some embodiments, the user can add marks at one or more positions on the blood vessel wall, and the method for determining the one or more measured positions on the blood vessel wall of the blood vessel in the ultrasound image in response to the selection operation of the user on the measured position can include: determining the one or more measured positions according to the marks added by the user.

[0040] In some embodiments, a region of interest frame can also be displayed on the blood vessel wall of the blood vessel, and the method for determining the one or more measured positions on the blood vessel wall of the blood vessel in the ultrasound image in response to the selection operation of the user on the measured position can further include: determining the positions in the blood vessel wall region included in the moved region of interest frame as the one or more measured positions in response to the operation of the user moving the region of interest frame.

[0041] Step 205: obtaining the shear index of each measured position within a preset time based on the ultrasound echo data.

[0042] In some embodiments, the shear index comprises a wall shear stress (WSS), and the step 205 can comprise calculating the wall shear stress based on the pulsed Doppler velocity measurements or based on the vector velocity calculated from the vector flow imaging.

[0043] In some embodiments, the wall shear stress can be a wall shear stress calculated by multiplying a blood viscosity coefficient by a velocity gradient on the vessel wall. The wall shear stress can be a value that varies over time, and thus when the wall shear stress is displayed, the wall shear stress displayed on the interface can vary over time, so that the user can understand the change in the wall shear stress over the entire observation period.

[0044] Specifically, the wall shear stress is calculated according to the formula: where τ represents the WSS value, μ is the liquid viscosity coefficient, v T represents the tangential component of the velocity along the vessel wall, and r represents the position information of the velocity v T , and wall represents the calculation position of the WSS on the vessel wall.

[0045] In the present application, the aforementioned μ particularly refers to the blood viscosity of the human body. Human blood is a non-Newtonian fluid, and thus theoretically the blood viscosity should be a variable (non-constant) value. This value is related to parameters such as the hematocrit of red blood cells and the plasma viscosity, and changes with the velocity gradient, but sometimes the influence is small. If only an approximate calculation is performed, a specific constant can also be directly used as the blood viscosity for WSS calculation. For example, when calculating the WSS of the carotid artery, an average blood viscosity value can be used, for example, 0.0035 Pa s, or expressed in centipoise (cP), 0.0035 Pa s = 3.5 cP. Of course, this value varies from person to person and has some fluctuations with factors such as age and gender, and even for the same person, this value also has fluctuations when the blood flow velocity changes. This value can also be measured by the falling ball method. In actual application, the default value given by the system can be used, and if the default value is considered to be inaccurate, a new value can be manually input for adjustment, for example, the user inputs a new blood viscosity value of the human body through the input device 50.

[0046] wherein the in the aforementioned formula for calculating the WSS may be represented as a velocity gradient, and represents the velocity gradient on the vessel wall, wherein v Trepresents a velocity component, i.e. a component of the velocity tangential to the vessel wall, and the velocity gradient on the aforementioned vessel wall is obtained by taking the partial derivative of the velocity component with respect to r on the vessel wall.

[0047] In some embodiments, the aforementioned velocity gradient on the vessel wall is calculated according to a formula: In some embodiments, the aforementioned velocity gradient on the vessel wall is calculated according to a formula:

[0048] In some embodiments, the shear index further comprises a wall shear rate (WSR), which is the aforementioned velocity gradient on the vessel wall. The calculation of the wall shear rate is understood with reference to the above description of the velocity gradient, which will not be repeated here.

[0049] In some embodiments, the shear index further comprises an oscillatory shear index (OSI), and the step 205 further comprises: calculating the aforementioned oscillatory shear index according to an integral of the wall shear stress over a preset time period.

[0050] The oscillatory shear index can measure the condition of the wall shear stress over the preset time period, and thus the oscillatory shear index can change with the cardiac cycle. When the oscillatory shear index is displayed, the oscillatory shear index displayed on the interface can change with the cardiac cycle, so that the user can understand the change of the oscillatory shear index over the entire observation time period. Further, the aforementioned processor 40 calculates the aforementioned oscillatory shear index according to an absolute value of an integral of the wall shear stress over the preset time period T and an integral of the absolute value of the aforementioned wall shear stress over the preset time period T.

[0051] Specifically, the calculation of the aforementioned oscillatory shear index according to an integral of the wall shear stress over a preset time period can comprise: calculating the aforementioned oscillatory shear index OSI according to a formula: ​

[0052] Step 207: Displaying corresponding mark information at the to-be-tested position according to the relationship between the shear index at the to-be-tested position and the preset index standard.

[0053] Therefore, in the present application, by displaying mark information for indicating whether the shear index meets the preset index standard at one or more to-be-tested positions, very intuitive indication can be provided to the user, facilitating quick determination of which positions are abnormal or which positions are normal.

[0054] The preset index standard at least includes an index standard for defining whether the shear index is normal or abnormal. Specifically, in some embodiments, the preset index standard includes a preset threshold range for indicating normality. When the shear index is within the preset threshold range, the shear index is a normal value, and when the shear index is outside the preset threshold range, the shear index is an abnormal value. Wherein, when the shear index is within the preset threshold range, it means that the relationship between the shear index at the to-be-tested position and the preset index standard is that the shear index at the to-be-tested position meets the preset index standard, and when the shear index is outside the preset threshold range, it means that the relationship between the shear index at the to-be-tested position and the preset index standard is that the shear index at the to-be-tested position does not meet the preset index standard.

[0055] The "controlling to display corresponding mark information at the to-be-tested position according to the relationship between the shear index at the to-be-tested position and the preset threshold range" includes: displaying mark information with corresponding color at the to-be-tested position according to whether the shear index at the to-be-tested position is within the preset threshold range.

[0056] Please refer to Figure 4 , a sub-flowchart of step 207 in an embodiment. Wherein, the shear index includes at least one type of index, and step 207 can specifically include:

[0057] Step 2071: Displaying mark information for indicating the corresponding type at the to-be-tested position according to the type of the shear index at the to-be-tested position.

[0058] Step 2072: Controlling corresponding mark information to present corresponding color according to whether each type of shear index is within the preset threshold range, wherein according to whether each type of shear index is within or outside the preset threshold range, the color of the corresponding mark information presented is different.

[0059] Wherein, Figure 4 The steps in the sub-flowchart of step 207 shown are also further steps of the aforementioned "displaying mark information with corresponding color at the to-be-tested position according to whether the shear index at the to-be-tested position is within the preset threshold range".

[0060] Among them, the shear index includes at least one of the wall shear stress, wall shear rate, and oscillatory shear index. The wall shear stress includes at least one of the maximum value and the average value of the wall shear stress within a preset time. The wall shear rate includes at least one of the maximum value and the average value of the wall shear rate within a preset time.

[0061] Therefore, in this application, the types of the shear index include at least one of the maximum value of the wall shear stress within a preset time, the average value of the wall shear stress within a preset time, and the oscillatory shear index.

[0062] Among them, the maximum value of the wall shear stress within the preset time refers to: the maximum wall shear stress among the multiple wall shear stresses measured within the preset time. The average value of the wall shear stress within the preset time refers to: the average value obtained by averaging the multiple wall shear stresses measured within the preset time. Among them, the average value can be the arithmetic average or geometric average of the multiple wall shear stresses measured within the preset time, and so on.

[0063] Among them, the maximum value of the wall shear rate within the preset time refers to: the maximum wall shear rate among the multiple wall shear rates measured within the preset time. The average value of the wall shear rate within the preset time refers to: the average value obtained by averaging the multiple wall shear rates measured within the preset time. Among them, the average value can be the arithmetic average or geometric average of the multiple wall shear rates measured within the preset time, and so on.

[0064] Among them, the multiple wall shear stresses measured within the preset time are multiple wall shear stresses obtained by intermittently acquiring based on the ultrasonic echo data within the preset time. The multiple wall shear rates measured within the preset time are multiple wall shear rates obtained by intermittently acquiring based on the ultrasonic echo data within the preset time.

[0065] Among them, the preset time can be one or more cardiac cycles.

[0066] In some embodiments, the above "displaying marker information for indicating the corresponding type at the position to be measured according to the type of the shear index at the position to be measured" includes: displaying marker information with corresponding shapes and / or sizes at the position to be measured according to the type of the shear index at the position to be measured, and the marker information indicates different types of the shear index according to different shapes and / or sizes.

[0067] That is, in some embodiments, the marker information has a specific shape and / or size, and according to different types of the shear index, the shape and / or size of the marker information are different, so that the type of the shear index can be indicated by the shape and / or size of the marker information.

[0068] For example, in some embodiments, when the type of the shear index at a certain to-be-measured position is the maximum value of the wall shear stress in a preset time, the marker information displayed at the to-be-measured position can be a triangle, when the type of the shear index at another to-be-measured position is the average value of the wall shear stress in a preset time, the marker information displayed at the another to-be-measured position can be a rectangle, when the type of the shear index at a further to-be-measured position is an oscillatory shear index, the marker information displayed at the further to-be-measured position can be an oval, and so on.

[0069] For example, in some embodiments, when the type of the shear index at a certain to-be-measured position is the maximum value of the wall shear stress in a preset time, the marker information displayed at the to-be-measured position can be a triangle, when the type of the shear index at another to-be-measured position is the average value of the wall shear stress in a preset time, the marker information displayed at the another to-be-measured position can also be a triangle, but the size is smaller or larger than the maximum value of the wall shear stress in the preset time, thereby constituting an indication of different types.

[0070] In some embodiments, the shear index includes an average value of the acquired wall shear stress in a preset time, and the preset threshold range further includes a shear stress average value preset threshold range; the above-mentioned "according to the type of the shear index at the to-be-measured position, displaying marker information for indicating the corresponding type at the to-be-measured position" further includes: displaying first marker information for indicating the average value of the wall shear stress at the to-be-measured position.

[0071] The above-mentioned "according to whether each type of the shear index is within the preset threshold range, controlling the corresponding marker information to present a corresponding color" includes: when the average value of the wall shear stress at the to-be-measured position is within the shear stress average value preset threshold range, controlling the first marker information to present a first color; and when the average value of the wall shear stress at the to-be-measured position is outside the shear stress average value preset threshold range, controlling the first marker information to present a second color. Wherein, the first color and the second color are different.

[0072] In some embodiments, the shear index further comprises a maximum value of the wall shear stress within a preset time, the preset threshold range comprises a preset threshold range of the maximum value of the wall shear stress; and the "displaying, at the to-be-tested position, the mark information for indicating the corresponding type according to the type of the shear index at the to-be-tested position" comprises: displaying, at the to-be-tested position, second mark information for indicating the maximum value of the wall shear stress.

[0073] The "controlling the mark information to present a corresponding color according to whether each type of the shear index is within the preset threshold range" comprises: when the maximum value of the wall shear stress at the to-be-tested position is within the preset threshold range of the maximum value of the wall shear stress, controlling the second mark information to present a third color; and when the maximum value of the wall shear stress at the to-be-tested position is outside the preset threshold range of the maximum value of the wall shear stress, controlling the second mark information to present a fourth color. The third color and the fourth color are different.

[0074] The first mark information and the second mark information are different in shape and / or size, thereby distinguishing the indication of the maximum value of the wall shear stress and the average value.

[0075] In some embodiments, the shear index further comprises an oscillatory shear index within a preset time, the preset threshold range further comprises a preset threshold range of the oscillatory shear index; and the "displaying, at the to-be-tested position, the mark information for indicating the corresponding type according to the type of the shear index at the to-be-tested position" further comprises: displaying, at the to-be-tested position, third mark information for indicating the oscillatory shear index.

[0076] The "controlling the mark information to present a corresponding color according to whether each type of the shear index is within the preset threshold range" comprises: when the oscillatory shear index at the to-be-tested position is within the preset threshold range of the oscillatory shear index, controlling the third mark information to present a fifth color; and when the oscillatory shear index at the to-be-tested position is outside the preset threshold range of the oscillatory shear index, controlling the third mark information to present a sixth color. The fifth color and the sixth color are different.

[0077] The first mark information, the second mark information, and the third mark information are different in shape and / or size, thereby distinguishing the indication of the maximum value of the wall shear stress, the average value, and the oscillatory shear index.

[0078] Among them, in the same to-be-measured position, only one type of one marker information for indicating the maximum value of the vascular wall shear stress in a preset time, the average value of the vascular wall shear stress in a preset time and the oscillatory shear index can be displayed, any two types of marker information for indicating the maximum value of the vascular wall shear stress in a preset time, the average value of the vascular wall shear stress in a preset time and the oscillatory shear index can be displayed at the same time, or all the marker information for indicating the three types can be displayed.

[0079] In some embodiments, the shear index includes an average value of the acquired vascular wall shear rate in a preset time, and the preset threshold range further includes a shear rate average value preset threshold range; and the "displaying, at the to-be-measured position, the marker information for indicating the corresponding type according to the type of the shear index at the to-be-measured position" further includes: displaying, at the to-be-measured position, fourth marker information for indicating the average value of the vascular wall shear rate.

[0080] The "controlling the corresponding marker information to present the corresponding color according to whether each type of shear index is within the preset threshold range" includes: when the average value of the vascular wall shear rate at the to-be-measured position is within the shear rate average value preset threshold range, controlling the fourth marker information to present a seventh color; and when the average value of the vascular wall shear rate at the to-be-measured position is outside the shear rate average value preset threshold range, controlling the fourth marker information to present an eighth color, wherein the eighth color is different from the seventh color.

[0081] In some embodiments, the shear index further includes a maximum value of the vascular wall shear rate in a preset time, and the preset threshold range includes a shear rate maximum value preset threshold range; and the "displaying, at the to-be-measured position, the marker information for indicating the corresponding type according to the type of the shear index at the to-be-measured position" includes: displaying, at the to-be-measured position, fifth marker information for indicating the maximum value of the vascular wall shear rate, wherein the fourth marker information and the fifth marker information are different in shape and / or size, so as to distinguish the maximum value of the vascular wall shear rate from the average value.

[0082] The "controlling the corresponding marker information to present the corresponding color according to whether each type of shear index is within the preset threshold range" includes: when the maximum value of the vascular wall shear rate at the to-be-measured position is within the shear rate maximum value preset threshold range, controlling the fifth marker information to present a ninth color; and when the maximum value of the vascular wall shear rate at the to-be-measured position is outside the shear rate maximum value preset threshold range, controlling the fifth marker information to present a tenth color, wherein the tenth color is different from the ninth color.

[0083] The first, second, third, fourth, and fifth mark information are different in shape and / or size, thereby distinguishing the maximum and average of the wall shear stress, the oscillatory shear index, and the maximum and average of the wall shear rate.

[0084] The first, second, third, fourth, and fifth mark information are different in shape and / or size, thereby distinguishing the maximum and average of the wall shear stress, the oscillatory shear index, and the maximum and average of the wall shear rate.

[0085] In some embodiments, since the wall shear stress is the product of the wall shear rate and the liquid viscosity μ, the wall shear stress and the wall shear rate are consistent in terms of whether they are normal, i.e., when the wall shear stress is normal, the wall shear rate must also be normal. Therefore, the corresponding indication information of the wall shear stress and the wall shear rate can not need to be displayed simultaneously, for example, when the first mark information or the second mark information indicating the maximum or average of the wall shear stress is displayed, the fourth mark information or the fifth mark information indicating the maximum or average of the wall shear rate does not need to be displayed.

[0086] In some embodiments, since the indication information corresponding to the wall shear stress and the wall shear rate does not need to be displayed simultaneously, the shape and / or size of the first mark information can be the same as that of the fourth mark information, and the shape and / or size of the second mark information can be the same as that of the fifth mark information.

[0087] Please refer to Figure 5 , which is a schematic diagram of displaying mark information at a to-be-measured position in an embodiment of the present application. As shown in Figure 5 , the first mark information J1 indicating the average of the wall shear stress in a preset time and the second mark information J2 indicating the maximum of the wall shear stress in a preset time are displayed at the same to-be-measured position.

[0088] For example, as shown in Figure 5As shown, for a certain to-be-measured position, the first marking information J1 is an ellipse pattern filling the to-be-measured position, and the second marking information J2 can be a contour line of the ellipse pattern of the first marking information J1.

[0089] Further, as shown in Figure 5 , when the average value of the wall shear stress in the preset time at the to-be-measured position P1 is within the preset threshold range of the shear stress average value, it is Figure 5 “normal average WSS” as shown in the Chinese text, the first marking information J1 at the to-be-measured position presents a first color, for example, green. When the maximum value of the wall shear stress at the to-be-measured position is also within the preset threshold range of the shear stress maximum value, it is Figure 5 “normal maximum WSS” as shown in the Chinese text, the second marking information J2 at the to-be-measured position presents a third color, for example, also green.

[0090] As shown in Figure 5 , for another to-be-measured position P2, if the average value of the wall shear stress in the preset time at the to-be-measured position P2 is outside the preset threshold range of the shear stress average value, it is Figure 5 “abnormal average WSS” as shown in the Chinese text, the first marking information J1 at the to-be-measured position presents a second color, for example, red. When the maximum value of the wall shear stress at the to-be-measured position is within the preset threshold range of the shear stress maximum value, it is Figure 5 “normal maximum WSS” as shown in the Chinese text, the second marking information J2 at the to-be-measured position presents a third color, for example, green.

[0091] Therefore, at the to-be-measured position, different shape patterns are used to distinguish the corresponding shear index types, and different colors are used to indicate whether the shear index type is normal, which can provide very intuitive indication to the user and facilitate quick determination of which positions of the blood vessel are abnormal.

[0092] Please refer to Figure 6 , which is a schematic diagram of displaying marking information at a to-be-measured position in another embodiment of the present application. As shown in Figure 6 , the first marking information J1 for indicating the average value of the wall shear stress in the preset time, the second marking information J2 for indicating the maximum value of the wall shear stress in the preset time, and the third marking information J3 for indicating the oscillatory shear index are displayed at the same to-be-measured position.

[0093] In one embodiment, when the above three types of shear index marking information are displayed simultaneously at a certain test location, the first marking information J1 is an elliptical pattern filling the test location P1, the second marking information J2 can be the outline of the elliptical pattern of the first marking information J1, and the third marking information J3 can be the outline of the second marking information with a shape approximately the same as the second marking information but a larger size.

[0094] Furthermore, such as Figure 6 As shown, when the average value of the shear stress in the blood vessel wall at the test location P3 within a preset time is outside the preset threshold range of the average shear stress, it is considered to be... Figure 6 When the Chinese characters indicate "Abnormal Average WSS", the first marker information J1 at the test location is displayed in a second color, for example, red. When the maximum value of the vessel wall shear stress at the test location is also within the preset threshold range of the maximum shear stress, it is considered... Figure 6 When the Chinese characters "Normal Maximum WSS" are displayed, the second marker information J2 at the test location will display a third color, for example, it could also be green. When the oscillation shear index at the test location is outside the preset threshold range of the oscillation, it is... Figure 6 When the Chinese characters indicate "abnormal OSI", the third marker information J3 at the test location will be displayed in a sixth color, for example, red.

[0095] like Figure 6 As shown, for another test location P4, if the average value of the blood vessel wall shear stress within a preset time at the test location P4 is within the preset threshold range of the average shear stress, then it is considered a satisfactory result. Figure 6 When the Chinese characters indicate "Normal Average WSS", the first marker information J1 at the test location is displayed in a first color, such as green. When the maximum value of the vessel wall shear stress at the test location is within the preset threshold range of the maximum shear stress, it is considered normal. Figure 6 When the Chinese characters "Normal Maximum WSS" are displayed, the second marker information at the test location is displayed in a third color, for example, it could also be green. When the oscillation shear index at the test location is within the preset threshold range of the oscillation, it is... Figure 6 When the Chinese characters indicate "Normal OSI", the third marker information J3 at the location to be tested will be displayed in the fifth color, for example, it can also be green.

[0096] Please see Figure 7 This is a schematic diagram illustrating the display of marking information at the location to be measured in another embodiment of this application. Wherein, as... Figure 7 As shown, at the same test location, a fourth marker J4 is displayed to indicate the average value of the vessel wall shear rate over a preset time period, and a fifth marker J5 is displayed to indicate the maximum value of the vessel wall shear rate over a preset time period.

[0097] For example, as shown in FIG. 4, for a certain to-be-tested position, the fourth mark information J4 can also be an ellipse pattern filling the to-be-tested position, and the fifth mark information J5 can be a contour line of the ellipse pattern of the fourth mark information J4. Figure 7

[0098] Further, as shown in FIG. 5, when the average value of the wall shear stress in the preset time at the to-be-tested position P5 is within the preset threshold range of the average shear stress, i.e., the "normal average WSR" as shown in the Chinese characters, the fourth mark information J4 at the to-be-tested position presents a seventh color, for example, green. Figure 7 Figure 7 When the maximum value of the wall shear rate at the to-be-tested position is also within the preset threshold range of the maximum shear rate, i.e., the "normal maximum WSR" as shown in the Chinese characters, the fifth mark information J5 at the to-be-tested position presents a ninth color, for example, also green. Figure 7

[0099] As shown in FIG. 6, for another to-be-tested position P6, if the average value of the wall shear rate in the preset time at the to-be-tested position P6 is outside the preset threshold range of the average shear rate, i.e., the "abnormal average WSR" as shown in the Chinese characters, the fourth mark information J4 at the to-be-tested position presents an eighth color, for example, red. Figure 7 Figure 7 When the maximum value of the wall shear rate at the to-be-tested position is within the preset threshold range of the maximum shear rate, i.e., the "normal maximum WSR" as shown in the Chinese characters, the fifth mark information J5 at the to-be-tested position presents a tenth color, for example, green. Figure 7

[0100] As shown in FIG. 7, the first mark information J1, the second mark information J2, the fourth mark information J4, and the fifth mark information J5 are displayed in the same to-be-tested position P5. Among them, as shown in FIG. 7, since the corresponding indication information of the wall shear stress and the wall shear rate does not need to be displayed at the same time, the shape and / or size of the first mark information can be the same as that of the fourth mark information, and the shape and / or size of the second mark information can be the same as that of the fifth mark information. In other embodiments, the shape and / or size of the first mark information is different from that of the fourth mark information, and the shape and / or size of the second mark information is also different from that of the fifth mark information. For example, the shape of the fourth mark information can be a triangular pattern filling the to-be-tested position, i.e., a solid pattern of a triangle, and the fifth mark information can be a contour line of the triangular pattern, and the like. Figure 7 Among them, since the relevant provisions of the Patent Law and the Guidelines for Patent Examination, the drawings cannot be used in color pictures,

[0101] , Figure 5 , Figure 6 ,​​​​​Figure 7 The representative of the deep color is red, and the representative of the light color is green.

[0102] Therefore, at the to-be-tested position, the corresponding shear index type is distinguished by different shape patterns, and whether the shear index type is normal is indicated by different colors, which can provide a very intuitive indication to the user, facilitating the quick determination of which positions of the blood vessel are abnormal.

[0103] In some embodiments, at different to-be-tested positions in the same ultrasound image, some to-be-tested positions can only display one type of shear index, and some positions can simultaneously display two or more types of shear index.

[0104] In some embodiments, the second color, the fourth color, and the sixth color are all the same, the first color, the third color, and the fifth color are all the same, or at least two of the first color, the third color, and the fifth color are different.

[0105] For example, the second color, the fourth color, and the sixth color are red, and the first color, the third color, and the fifth color are green.

[0106] Obviously, in other embodiments, the second color, the fourth color, and the sixth color can also be different colors respectively, and the first color, the third color, and the fifth color can also be different colors.

[0107] For example, the second color is red, the fourth color is brown, and the sixth color is orange; the first color is green, the third color is blue, and the fifth color is cyan, and the like.

[0108] The eighth color can also be the same as the second color, the fourth color, and the sixth color, for example, all red, and the eighth color can also be the same as one of the first color, the third color, and the fifth color, for example, green.

[0109] In some embodiments, the second color, the fourth color, the sixth color, and the eighth color can also be different colors respectively, and the first color, the third color, the fifth color, and the seventh color can also be different colors. For example, the second color is red, the fourth color is brown, the sixth color is orange, and the eighth color is purple; the first color is green, the third color is blue, the fifth color is cyan, and the seventh color is goose yellow, and the like.

[0110] In some embodiments, the preset index standard further includes an index standard for defining whether the shear index is between normal and abnormal. The preset index standard further includes a critical preset threshold range for indicating a critical state between normal and abnormal.

[0111] In the embodiment, the critical preset threshold range is formed by dividing the aforementioned preset threshold range.

[0112] That is, in the embodiment, the preset threshold range includes a first preset sub-threshold range and a second preset sub-threshold range, and the "displaying the mark information with the corresponding color at the to-be-tested position according to whether the shear index at the to-be-tested position is within the preset threshold range" includes:

[0113] displaying the mark information with the corresponding color at the to-be-tested position according to whether the shear index at the to-be-tested position is within the preset threshold range, the first preset sub-threshold range, or the second preset sub-threshold range, wherein the color of the mark information is different according to different cases that the shear index at the to-be-tested position is located outside the preset threshold range, within the first preset sub-threshold range, or within the second preset sub-threshold range.

[0114] The first preset sub-threshold range and the second preset sub-threshold range are adjacent threshold ranges, i.e., have a common boundary value. In some embodiments, the values in the first preset sub-threshold range are all less than the values in the second preset sub-threshold range except for the boundary value.

[0115] When the shear index is located within the first preset sub-threshold range, it indicates that the shear index is a completely normal value, and the mark information with a certain color, e.g., green, is displayed at the to-be-tested position for indication. When the shear index is located within the second preset sub-threshold range, it indicates that the shear index is between normal and abnormal, and the mark information with another color, e.g., yellow, is displayed at the to-be-tested position for indication. When the shear index at the to-be-tested position is outside the preset threshold range, it indicates that the shear index is an abnormal value, and the mark information with other color, e.g., red, is displayed at the to-be-tested position for indication.

[0116] Further taking the oscillation shear index in a preset time as an example, the corresponding oscillation preset threshold range can be a value between 0 and 0.1, the first preset sub-threshold range can be 0-0.08, and the second preset sub-threshold range can be 0.08-0.1. Thus, when the oscillation shear index is located within 0-0.08, it indicates that the oscillation shear index is completely normal, and the mark information with a certain color, e.g., green, is displayed at the to-be-tested position for indication. When the oscillation shear index is located within 0.08-0.1, it indicates that the oscillation shear index is between normal and abnormal, and the mark information with another color, e.g., yellow, is displayed at the to-be-tested position for indication. When the oscillation shear index exceeds 0.1, it indicates that the oscillation shear index is abnormal, and the mark information with other color, e.g., red, is displayed at the to-be-tested position for indication.

[0117] Therefore, in the present application, the content that can be indicated is enriched by presenting the marking information corresponding to the oscillatory shear index of a certain type in multiple colors to indicate at least three states of normal, abnormal, and between abnormal and normal.

[0118] In the present application, the shear index being within the preset threshold range or the preset sub-threshold range means being greater than or equal to the minimum value of the preset threshold range and being less than or equal to the maximum value of the preset threshold range or the preset sub-threshold range; the shear index being outside the preset threshold range or the preset sub-threshold range means being greater than the maximum value of the preset threshold range and being less than the minimum value of the preset threshold range or the preset sub-threshold range.

[0119] In other embodiments, the second preset sub-threshold range for indicating between abnormal and normal can also not be within the preset threshold range, for example, three threshold ranges can be defined separately to correspond to normal shear index, shear index between normal and abnormal, and abnormal shear index, respectively.

[0120] Please refer to Figure 8 The flowchart of the method for displaying the shear index of the blood vessel wall in another embodiment of the present application is shown in FIG. 8. In another embodiment, the method comprises the following steps:

[0121] Step 801: Determine whether the shear index at each to-be-measured position in the preset region of interest is within the preset threshold range.

[0122] Step 803: Calculate the proportion of the shear index within and outside the preset threshold range in all shear indices.

[0123] In some embodiments, each to-be-measured position can be a unit, each unit can obtain a corresponding shear index, then the number of shear indices within the preset threshold range and the number of shear indices outside the preset threshold range are found out, and then the total number of units in the region of interest is divided by the number of shear indices within the preset threshold range and the number of shear indices outside the preset threshold range, respectively, to obtain the proportion of the shear index within and outside the preset threshold range in all shear indices.

[0124] Step 805: Display the proportion. That is, display the proportion of the shear index within and outside the preset threshold range in all shear indices.

[0125] In the step 805, the proportion of the shear index within the preset threshold range in all shear indices can be marked with the color of the marking information for indicating that the shear index is within the preset threshold range, and the proportion of the shear index outside the preset threshold range in all shear indices can be marked with another color of the marking information for indicating that the shear index is outside the preset threshold range.

[0126] For example, when the proportions of the shear indices within and outside the preset threshold range in all the shear indices are 88% and 12% respectively, the 88% proportion is marked with the color indicating that the shear index is within the preset threshold range as mentioned above, and the 12% proportion is marked with another color indicating that the shear index is outside the preset threshold range as mentioned above.

[0127] In some embodiments, the step 805 can further include displaying columnar proportion patterns of different lengths and proportion values according to the proportions of the shear indices within and outside the preset threshold range, wherein each columnar proportion pattern presents the same color as the corresponding marking information.

[0128] For example, when the proportions of the shear indices within and outside the preset threshold range in all the shear indices are 88% and 12% respectively, the 88% proportion and the 12% proportion are respectively indicated by columnar patterns of corresponding proportion lengths, and the colors of the columnar patterns are the same as the colors of the corresponding marking information indicating that the shear index is within or outside the preset threshold range.

[0129] The steps 801-805 can be performed before or after each of the steps shown in Figure 2 .

[0130] Thus, for an ultrasound image, the marking information can be displayed at the to-be-tested positions to indicate the types of the shear indices and whether the shear indices are normal or not, and the proportions of the shear indices of the corresponding types being normal, abnormal, etc. at all the to-be-tested positions in a region of interest can also be displayed at a position in the ultrasound image.

[0131] Please refer to Figure 9 for an ultrasound image of a to-be-tested tissue containing blood vessels in an embodiment of the present application. As shown in Figure 8 , when the preset threshold range further includes a first sub-preset threshold range and a second sub-preset threshold range, the step 803 can further include counting the proportions of the shear indices within the first sub-preset threshold range, within the second sub-preset threshold range, and outside the preset threshold range in all the shear indices. The step 805 can include simultaneously displaying the proportion of the shear indices within the first sub-preset threshold range, the proportion of the shear indices within the second sub-preset threshold range, and the proportion of the shear indices outside the preset threshold range in all the shear indices.

[0132] For example, as shown in Figure 9As shown, when the shear index includes the average of the wall shear stress (i.e., average WSS) in the preset time, the ultrasound image shows the proportion of normal values, abnormal values, and values between normal and abnormal values of the average of the wall shear stress in the preset time. For example, as shown in Figure 9 As shown, the green in the column corresponding to "average WSS" represents normal values, accounting for 86.6%, the yellow represents values between normal and abnormal, accounting for 5.1%, and the red represents abnormal values, accounting for 8.3%.

[0133] According to the type of the shear index included, the ultrasound image can display the proportion of the shear index within and outside the preset threshold range corresponding to the type of the shear index. Obviously, when the preset threshold range further includes the first sub-preset threshold range and the second sub-preset threshold range, according to the type of the shear index included, the ultrasound image can display the proportion of the shear index within the first sub-preset threshold range, within the second sub-preset threshold range, and outside the preset threshold range in all shear indexes.

[0134] For example, as shown in Figure 9 The shear index can further include the maximum of the wall shear stress in the preset time (i.e., maximum WSS). As shown in Figure 9 As shown, the proportion corresponding to the column of "maximum WSS" is also displayed, for example, the green in the column of "maximum WSS" represents normal values, accounting for 90.9%, the yellow represents values between normal and abnormal, accounting for 3.9%, and the red represents abnormal values, accounting for 5.2%.

[0135] As shown in Figure 9 The shear index can further include the oscillatory shear index (i.e., OSI). As shown in Figure 9 As shown, the proportion corresponding to the column of "OSI" is also displayed, for example, the green in the column of "OSI" represents normal values, accounting for 89.5%, the yellow represents values between normal and abnormal, accounting for 4.8%, and the red represents abnormal values, accounting for 5.7%.

[0136] Please refer to Figure 10 for the ultrasound image of the measured tissue containing blood vessels in another embodiment of the present application. Wherein, Figure 10 and Figure 9 The difference between them is that the wall shear stress (WSS) in Figure 9 is replaced by the wall shear rate (WSR).

[0137] For example, as shown in Figure 10As shown, when the shear index comprises the average of the wall shear rate in the preset time (i.e., average WSR), the ultrasound image shows the proportion of normal values, abnormal values and values between normal and abnormal of the average of the wall shear stress in the preset time. As shown in Figure 10 As shown, the green in the column corresponding to "average WSR" represents normal values, accounting for 86.6%, the yellow represents values between normal and abnormal, accounting for 5.1%, and the red represents abnormal values, accounting for 8.3%.

[0138] As shown in Figure 10 The shear index can further comprise the maximum of the wall shear rate in the preset time (i.e., maximum WSR). As shown in Figure 10 As shown, the proportion corresponding to the column of "maximum WSR" is also displayed, for example, the green in the column of "maximum WSR" represents normal values, accounting for 90.9%, the yellow represents values between normal and abnormal, accounting for 3.9%, and the red represents abnormal values, accounting for 5.2%.

[0139] As shown in Figure 10 The shear index can further comprise the oscillatory shear index (i.e., OSI). As shown in Figure 10 As shown, the proportion corresponding to the column of "OSI" is also displayed, for example, the green in the column of "OSI" represents normal values, accounting for 89.5%, the yellow represents values between normal and abnormal, accounting for 4.8%, and the red represents abnormal values, accounting for 5.7%.

[0140] Wherein, due to the relevant provisions of the Patent Law and the Guidelines for Examination, the deepest color in the color picture, Figure 9 ,represents red, the second deepest color represents green, and the lightest color represents yellow. Figure 10

[0141] Wherein, the region of interest is the region where the aforementioned one or more to-be-measured positions are located.

[0142] Please refer to Figure 11 for the flowchart of the blood vessel wall shear index display method in another embodiment of the present application. As shown in Figure 11 The method comprises:

[0143] Step 111: control the display of a region of interest frame corresponding to the region of interest.

[0144] Please refer to Figure 12 for the schematic diagram of the ultrasound image of the measured tissue containing blood vessels in another embodiment of the present application. As shown in Figure 12As shown, the ultrasound image can display a region of interest frame K1, and each position included in the region of interest frame K1 can be one of the aforementioned one or more to-be-measured positions. The to-be-measured positions in the region of interest frame K1 are displayed with corresponding marking information B0.

[0145] Step 113: moving the region of interest frame and / or adjusting the size or shape of the region of interest in response to the user's adjustment operation.

[0146] Step 115: determining at least one or more updated to-be-measured positions included in the region of interest frame after being moved and / or adjusted in size or shape, and acquiring a shear index at each updated to-be-measured position within a preset time based on the ultrasound echo data.

[0147] Step 117: displaying corresponding marking information at the updated to-be-measured position according to the relationship between the shear index at the updated to-be-measured position and the preset index standard.

[0148] Step 115 corresponds to step 205 in Figure 2 , and step 117 corresponds to step 207 in Figure 2 . For more specific content, please refer to the foregoing description related to steps 205 and 207.

[0149] Thus, in the present application, the user can drag the region of interest frame K1 to obtain the normal, abnormal, etc. state of the shear index at the to-be-measured position in different regions.

[0150] In the flowchart shown, each step can be executed after step 207 shown in Figure 11 , or before step 201 shown in Figure 2 . Figure 2

[0151] In the method shown, the shear index at each to-be-measured position in the region of interest frame after being moved and / or adjusted in size or shape can be determined. Figure 11 In the method shown, the method can further include: respectively determining whether the shear index at each to-be-measured position in the region of interest frame after being moved and / or adjusted in size or shape is within the preset threshold range; counting the proportion of the shear indices within and outside the preset threshold range in all shear indices; and displaying the proportion.

[0152] Figure 8 The above "respectively determining whether the shear index at each to-be-measured position in the region of interest frame after being moved and / or adjusted in size or shape is within the preset threshold range" corresponds to step 801 in Figure 8 , the above "counting the proportion of the shear indices within and outside the preset threshold range in all shear indices" corresponds to step 803 in Figure 8 ​​The step 805 in the method corresponds to the step 805, and more details can be found in the foregoing description of the steps 801, 803 and 805 respectively.

[0153] When the ultrasound image is first displayed, the region of interest frame K1 can be displayed by default in a preset region in the ultrasound image, for example, in the center region of the ultrasound image, and can be moved or resized in response to a user's setting operation, such as dragging the edge of the region of interest frame K1. Alternatively, the shape of the region of interest frame K1 can also be adjusted in response to the user's operation, for example, the user can drag the edge of the region of interest frame K1 to adjust the rectangular region of interest frame K1 to an oval or any irregular shape.

[0154] The region of interest frame K1 can be a rectangular frame, a circular frame, an oval frame, an irregularly shaped frame, or any other shape frame visible to the user.

[0155] In some embodiments, the method for displaying the vascular wall shear index can further include the following steps:

[0156] When two or more types of shear indices are acquired and displayed simultaneously at the same to-be-measured position, if it is determined that at least two types of shear indices at the same to-be-measured position are both outside the preset threshold range, i.e., are abnormal, a specific marker is controlled to be displayed to indicate the to-be-measured position, or the corresponding marker information of the at least two types of shear indices that are abnormal at the to-be-measured position are both presented in a specific color.

[0157] For example, please refer to Figure 13 The ultrasound image of the measured tissue containing blood vessels in some embodiments of the present application is shown in the figure. The specific marker T1 can be an arrow marker, and the area pointed by the arrow is the to-be-measured position where at least two types of shear indices are both outside the preset threshold range.

[0158] The specific color can be a color different from the color used to indicate the abnormality of any type of shear index described above. For example, the specific color can be purple, etc.

[0159] Further, for example, for the same to-be-measured position, if the average value of the vascular wall shear stress in the preset time (i.e., the average WSS) and the maximum value of the vascular wall shear stress in the preset time (i.e., the maximum WSS) are both abnormal, a specific color or an additional specific marker T1 can also be displayed at the to-be-measured position to indicate the to-be-measured position.

[0160] Similarly, for the same test location, if both the average WSS and OSI measurements are abnormal, a specific color or an additional specific marker T1 can be displayed at that test location to indicate the location.

[0161] For the same test location, if the average WSS, maximum WSS, and OSI measurements are all abnormal, a specific color or an additional specific marker T1 can be displayed at the test location to indicate the test location.

[0162] Please see Figure 14 The diagram shown is a block diagram of an ultrasound imaging system according to another embodiment of this application. Figure 12 As shown, the ultrasound imaging system 200 can be applied to the above embodiments. The ultrasound imaging system 200 provided in this application will be described below. The ultrasound imaging system 200 may include a processor 21, a storage device 22, a probe 23 and a display 24, as well as a computer program (instructions) stored in the storage device 22 and available for call by the processor 21 to run on the processor 21. The ultrasound imaging system 200 may also include other hardware components, such as communication devices, buttons, keyboards, etc., which will not be described in detail here.

[0163] The processor 21 can exchange data with the probe 23, storage device 22 and display 24 via signal line 25.

[0164] The processor 21 is also used to obtain an ultrasound image of the target tissue and store the ultrasound image of the target tissue in the storage device 22.

[0165] The processor 21 can be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or any conventional processor. This processor is the control center of the ultrasound imaging system 200, connecting all parts of the ultrasound imaging system 200 via various interfaces and lines.

[0166] The storage device 22 can be configured to store the computer programs and / or modules, and the processor 21 can implement some or all of the steps of the blood vessel wall shear index display method by running or executing the computer programs and / or modules stored in the storage device 22 and calling the data stored in the storage device 22.

[0167] For example, the processor 21 can execute the following steps by running or executing the computer programs and / or modules stored in the storage device 22:

[0168] controlling the probe to emit ultrasound waves to a measured tissue containing a blood vessel, and generating ultrasound echo data after receiving ultrasound echoes returned by the measured tissue;

[0169] obtaining an ultrasound image containing the blood vessel based on the ultrasound echo data, determining a blood vessel wall of the blood vessel, and determining one or more to-be-measured positions on the blood vessel wall in the ultrasound image;

[0170] acquiring a shear index at each to-be-measured position within a preset time based on the ultrasound echo data;

[0171] displaying corresponding mark information at the to-be-measured position according to the relationship between the shear index at the to-be-measured position and a preset index standard.

[0172] The storage device 22 can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, application programs required by at least one function, and the like. In addition, the storage device 802 can include a high-speed random access storage device, and can further include a non-volatile storage device, such as a hard disk, a memory, a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, at least one disk storage device, a flash memory device, or other volatile solid-state storage devices.

[0173] The display 24 can display a user interface (UI), a graphical user interface (GUI), and a corresponding ultrasound image of the measured tissue. The ultrasound imaging system 200 can also be used as an input device and an output device. The display 24 can include at least one of a liquid crystal display (LCD), a thin-film transistor LCD (TFT-LCD), an organic light-emitting diode (OLED) touch display, a flexible touch display, a three-dimensional (3D) touch display, and the like.

[0174] As described above, the processor 21 can run a program corresponding to the executable program code stored in the storage device 22 by reading the executable program code, so as to execute the blood vessel wall shear index display method in any one of the preceding embodiments.

[0175] In the present application, the ultrasound imaging system 100, 200 can be an ultrasound imaging device integrated with a display, or a display and an ultrasound imaging device connected together through wired or wireless means.

[0176] In the above embodiments, the description of each embodiment is focused on one aspect, and the part not described in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0177] Various exemplary embodiments are described herein. However, those skilled in the art will recognize that changes and modifications can be made to the exemplary embodiments without departing from the scope hereof. For example, various operational steps and components for carrying out the operational steps can be implemented in different sequences and / or omitted, combined, or combined in various ways than presented in the figures and / or descriptions without departing from the scope hereof.

[0178] The present application also provides a computer readable storage medium, which stores computer program instructions, and the computer program instructions are executed by a processor to implement the blood vessel wall shear index display method in any one of the preceding embodiments.

[0179] In addition, as understood by those skilled in the art, the principles herein can be reflected in a computer program product on a computer readable storage medium preloaded with computer readable program code. Any tangible, non-transitory computer readable storage medium can be used, including magnetic storage devices (hard disk, floppy disk, etc.), optical storage devices (CD-ROM, DVD, Blu Ray disc, etc.), flash memory, and / or the like. These computer program instructions can be loaded onto a general-purpose computer, a special-purpose computer, or other programmable data processing apparatus to form a machine, so that these instructions executed on the computer or other programmable data processing apparatus can generate a device that implements the specified function. These computer program instructions can also be stored in a computer readable storage medium, which can instruct the computer or other programmable data processing apparatus to operate in a specific way, so that the instructions stored in the computer readable storage medium can form a piece of manufacturing product, including an implementation device that implements the specified function. Computer program instructions can also be loaded onto a computer or other programmable data processing apparatus, so as to execute a series of operational steps on the computer or other programmable data processing apparatus to generate a computer-implemented process, so that the instructions executed on the computer or other programmable data processing apparatus can provide steps for implementing the specified function.

[0180] While the principles of the present disclosure have been illustrated in various embodiments, many modifications of structure, arrangement, proportions, elements, materials, and components which are specifically adapted to specific environments and operational requirements can be employed without departing from the principles and scope of the disclosure. Such modifications and other changes or modifications are intended to be included within the scope of the present disclosure.

[0181] The foregoing detailed description has been described with reference to various embodiments. However, one of ordinary skill in the art will recognize that modifications can be made to the described embodiments, and other implementations could be derived without departing from the scope of the present disclosure. Accordingly, the disclosure of this patent is meant to be illustrative and not limiting of the scope or spirit of the application. All these modifications are included within the scope of the present disclosure. Likewise, the benefits, advantages, solutions to problems, and any element(s) that can cause any benefit, advantage or solution to occur or become more pronounced are not to be construed as critical, required, or essential features of the application. The terms "include" and variations thereof do not have a limiting meaning and open up the possibility that "comprising", "comprises" and / or "comprised of" may be used in addition to "including", "includes" and / or "included of".

[0182] The above detailed description of the application has been described with reference to specific examples. The description of the principles and embodiments of the application are described herein using specific examples. The above description of the embodiments is intended to assist understanding of the method of the present application and its core idea; at the same time, for those skilled in the art, according to the idea of the present application, the specific embodiments and application scope will be changed. In summary, the content of the specification should not be understood as a limitation of the present application.

Claims

1. A method of displaying a vascular wall shear index, characterized by, The blood vessel wall shear index display method comprises: emitting ultrasonic waves to a measured tissue containing a blood vessel through a probe, and generating ultrasonic echo data after receiving ultrasonic echoes returned by the measured tissue; obtaining an ultrasonic image containing the blood vessel based on the ultrasonic echo data, determining a blood vessel wall of the blood vessel, and determining one or more to-be-measured positions on the blood vessel wall in the ultrasonic image; acquiring a shear index at each to-be-measured position within a preset time based on the ultrasonic echo data; displaying corresponding mark information at the to-be-measured position according to a relationship between the shear index at the to-be-measured position and a preset index standard, wherein the mark information comprises a shape and / or a size, and the shape and / or the size of the mark information correspond to a type of the shear index at the to-be-measured position, so as to indicate the type of the shear index; the preset index standard comprises a preset threshold range for indicating normality, and the shear index comprises at least two of a maximum value of a blood vessel wall shear stress, an average value of the blood vessel wall shear stress, a maximum value of a blood vessel wall shear rate, an average value of the blood vessel wall shear rate, and an oscillatory shear index; wherein the shape and / or the size of the mark information for indicating the maximum value of the blood vessel wall shear stress, the average value of the blood vessel wall shear stress, the maximum value of the blood vessel wall shear rate, the average value of the blood vessel wall shear rate, and the oscillatory shear index are different, and the color of the mark information for indicating whether the maximum value of the blood vessel wall shear stress, the average value of the blood vessel wall shear stress, the maximum value of the blood vessel wall shear rate, the average value of the blood vessel wall shear rate, and the oscillatory shear index are within or outside the preset threshold range is different.

2. The blood vessel wall shear index display method of claim 1, wherein, the displaying of the mark information for indicating the corresponding type at the to-be-measured position according to the type of the shear index at the to-be-measured position comprises: the displaying of the mark information with a corresponding shape and / or size at the to-be-measured position according to the type of the shear index at the to-be-measured position, wherein the shape and / or the size of the mark information are used to indicate the type of the shear index.

3. The blood vessel wall shear index display method of claim 1, wherein, the shear index comprises an average value of the blood vessel wall shear stress acquired within a preset time, and the preset threshold range further comprises a shear stress average value preset threshold range; the displaying of the mark information for indicating the corresponding type at the to-be-measured position according to the type of the shear index at the to-be-measured position further comprises: displaying first mark information for indicating the average value of the blood vessel wall shear stress at the to-be-measured position; controlling the corresponding mark information to present a corresponding color according to whether each type of the shear index is within the preset threshold range, comprising: controlling the first mark information to present a first color when the average value of the blood vessel wall shear stress at the to-be-measured position is within the shear stress average value preset threshold range; and controlling the first mark information to present a second color when the average value of the blood vessel wall shear stress at the to-be-measured position is outside the shear stress average value preset threshold range.

4. The blood vessel wall shear index display method of claim 3, wherein, when the shear index further comprises a maximum value of the blood vessel wall shear stress within a preset time, the preset threshold range comprises a shear stress maximum value preset threshold range; the first marker information and the second marker information are different in shape and / or size, so as to distinguish the maximum value and the average value of the wall shear stress; the first marker information and the second marker information are different in shape and / or size, so as to distinguish the maximum value and the average value of the wall shear stress; the first marker information and the second marker information are different in shape and / or size, so as to distinguish the maximum value and the average value of the wall shear stress; the first marker information and the second marker information are different in shape and / or size, so as to distinguish the maximum value and the average value of the wall shear stress; the first marker information and the second marker information are different in shape and / or size, so as to distinguish the maximum value and the average value of the wall shear stress.

5. The blood vessel wall shear index display method of claim 4, wherein, the first marker information and the second marker information are different in shape and / or size, so as to distinguish the maximum value and the average value of the wall shear stress. the first marker information and the second marker information are different in shape and / or size, so as to distinguish the maximum value and the average value of the wall shear stress. the first marker information and the second marker information are different in shape and / or size, so as to distinguish the maximum value and the average value of the wall shear stress. the first marker information and the second marker information are different in shape and / or size, so as to distinguish the maximum value and the average value of the wall shear stress. the first marker information and the second marker information are different in shape and / or size, so as to distinguish the maximum value and the average value of the wall shear stress. the first marker information and the second marker information are different in shape and / or size, so as to distinguish the maximum value and the average value of the wall shear stress.

6. The blood vessel wall shear index display method of claim 5, wherein, the first marker information and the second marker information are different in shape and / or size, so as to distinguish the maximum value and the average value of the wall shear stress.

7. The blood vessel wall shear index display method of claim 5, wherein, the first marker information and the second marker information are different in shape and / or size, so as to distinguish the maximum value and the average value of the wall shear stress.

8. The blood vessel wall shear index display method of claim 7, wherein, the first marker information and the second marker information are different in shape and / or size, so as to distinguish the maximum value and the average value of the wall shear stress.

9. The blood vessel wall shear index display method of claim 1, wherein, the first marker information and the second marker information are different in shape and / or size, so as to distinguish the maximum value and the average value of the wall shear stress. the first marker information and the second marker information are different in shape and / or size, so as to distinguish the maximum value and the average value of the wall shear stress. the first marker information and the second marker information are different in shape and / or size, so as to distinguish the maximum value and the average value of the wall shear stress. the first marker information and the second marker information are different in shape and / or size, so as to distinguish the maximum value and the average value of the wall shear stress. the first marker information and the second marker information are different in shape and / or size, so as to distinguish the maximum value and the average value of the wall shear stress. the first marker information and the second marker information are different in shape and / or size, so as to distinguish the maximum value and the average value of the wall shear stress. the first marker information and the second marker information are different in shape and / or size, so as to distinguish the maximum value and the average value of the wall shear stress. the first marker information and the second marker information are different in shape and / or size, so as to distinguish the maximum value and the average value of the wall shear stress. the first marker information and the second marker information are different in shape and / or size, so as to distinguish the maximum value and the average value of the wall shear stress. the first marker information and the second marker information are different in shape and / or size, so as to distinguish the maximum value and the average value of the wall shear stress. the first marker information and the second marker information are different in shape and / or size, so as to distinguish the maximum value and the average value of the wall shear stress. the first marker information and the second marker information are different in shape and / or size, so as to distinguish the maximum value and the average value of the wall shear stress. the first marker information and the second marker information are different in shape and / or size, so as to distinguish the maximum value and the average value of the wall shear stress. the first marker information and the second marker information are different in shape and / or size, so as to distinguish the maximum value and the average value of the wall shear stress. the first marker information and the second marker information are different in shape and / or size, so as to distinguish the maximum value and the average value of the wall shear stress. the first marker information and the second marker information are different in shape and / or size, so as to distinguish the maximum value and the average value of the wall shear stress. the first marker information and the second marker information are different in shape and / or size, so as to distinguish the maximum value and the average value of the wall shear stress. the first marker information and the second marker information are different in shape and / or size, so as to distinguish the maximum value and the average value of the wall shear stress. the first marker information and the second marker information are different in shape and / or size, so as to distinguish the maximum value and the average value of the wall shear stress. the first marker information and the second marker information are different in shape and / or size, so as to distinguish the maximum value and the average value of the wall shear stress. the first marker information and the second marker information are different in shape and / or size, so as to distinguish the maximum value and the average value of the wall shear stress. the first marker information and the second marker information are different in shape and / or size, so as to distinguish the maximum value and the average value of the wall shear stress. the first marker information and the second marker information are different in shape and / or size, so as to distinguish the maximum value and the average value of the wall shear stress. the first marker information and the second marker information are different in shape and / or size, so as to distinguish the maximum value and the average value of the wall shear stress. the first marker information and the second marker information are different in shape and / or size, so as to distinguish the maximum value and the average value of the wall shear stress. the first marker information and the second marker information are different in shape and / or size, so as to distinguish the maximum value and the average value of the wall shear stress. the first marker information and the second marker information are different in shape and / or size, so as to distinguish the maximum value and the average value of the wall shear stress. the first marker information and the second marker information are different in shape and / or size, so as to distinguish the maximum value and the average value of the wall shear stress. the first marker information and the second marker information are different in shape and / or size, so as to distinguish the maximum value and the average value of the wall shear stress. the first marker information and the second marker information are different in shape and / or size, so as to distinguish the maximum value and the average value of the wall shear stress. the first marker information and the second marker information are different in shape and / or size, so as to distinguish the maximum value and the average value of the wall shear stress. the first marker information and the second marker information are different in shape and / or size, so as to distinguish the maximum value and the average value of the wall shear stress. the first marker information and the second marker information are different in shape and / or size, so as to distinguish the maximum value and the average value of the wall shear stress. the first marker information and the second marker information are different in shape and / or size, so as to distinguish the maximum value and the average value of the wall shear stress. the first marker information and the second marker information are different in shape and / or size, so as to distinguish the maximum value and the average value of the wall shear stress. the first marker information and the second marker information are different in shape and / or size, so as to distinguish the maximum value and the average value of the wall shear stress. the first marker information and the second marker information are different in shape and / or size, so as to distinguish the maximum value and the average value of the wall shear stress. the first marker information and the second marker information are different in shape and / or size, so as to distinguish the maximum value and the average value of the wall shear stress. the first marker information and the second marker information are different in shape and / or size, so as to distinguish the maximum value and the average value of the wall shear stress. the first marker information and the second marker information are different in shape and / or size, so as to distinguish the maximum value and the average value of the wall shear stress. the first marker information and the second marker information are different in shape and / or size, so as to distinguish the maximum value and the average value of the wall shear stress. the first marker information and the second marker information are different in shape and / or size, so as to distinguish the maximum value and the average value of the wall shear stress. the first marker information and the second marker information are different in shape and / or size, so as to distinguish the maximum value and the average value of the wall shear stress. the first marker information and the second marker information are different in shape and / or size, so as to distinguish the maximum value and the average value of the wall shear stress. the first marker information and the second marker information are different in shape and / or size, so as to distinguish the maximum value and the average value of the wall shear stress. the first marker information and the second marker information are different in shape and / or size, so as to distinguish the maximum value and the average value of the wall shear stress. the first marker information and the second marker when the average value of the wall shear rate at the to-be-tested position is within the preset threshold range of the average value of the wall shear rate, controlling the fourth mark information to present a seventh color; and when the average value of the wall shear rate at the to-be-tested position is outside the preset threshold range of the average value of the wall shear rate, controlling the fourth mark information to present an eighth color, wherein the eighth color is different from the seventh color.

10. The blood vessel wall shear index display method of claim 9, wherein, when the shear index further comprises a maximum value of the wall shear rate within a preset time, the preset threshold range comprises a preset threshold range of the maximum value of the wall shear rate; the displaying of the mark information corresponding to each type of the shear index at the to-be-tested position comprises: displaying fifth mark information for indicating the maximum value of the wall shear rate at the to-be-tested position, wherein the fourth mark information and the fifth mark information are different in shape and / or size, so as to distinguish the maximum value of the wall shear rate from the average value of the wall shear rate; the controlling of the corresponding mark information to present a corresponding color according to whether each type of the shear index is within the preset threshold range comprises: when the maximum value of the wall shear rate at the to-be-tested position is within the preset threshold range of the maximum value of the wall shear rate, controlling the fifth mark information to present a ninth color; and when the maximum value of the wall shear rate at the to-be-tested position is outside the preset threshold range of the maximum value of the wall shear rate, controlling the fifth mark information to present a tenth color, wherein the tenth color is different from the ninth color.

11. The blood vessel wall shear index display method according to any one of claims 1 to 10, wherein, the preset threshold range comprises a first preset sub-threshold range and a second preset sub-threshold range, and the displaying of the mark information with a corresponding color at the to-be-tested position according to whether the shear index at the to-be-tested position is within the preset threshold range comprises: displaying the mark information with a corresponding color at the to-be-tested position according to whether the shear index at the to-be-tested position is outside the preset threshold range, within the first preset sub-threshold range, or within the second preset sub-threshold range, wherein the color of the mark information is different according to different cases that the shear index at the to-be-tested position is outside the preset threshold range, within the first preset sub-threshold range, or within the second preset sub-threshold range.

12. The blood vessel wall shear index display method according to any one of claims 1 to 10, wherein, a plurality of to-be-tested positions are located in a preset region of interest, and the method further comprises: respectively determining whether the shear index at each to-be-tested position is within the preset threshold range; counting the proportion of the shear indices within and outside the preset threshold range in all the shear indices; displaying the proportion.

13. The blood vessel wall shear index display method of claim 12, wherein, the displaying of the proportion comprises: displaying columnar proportion patterns of different lengths and proportion values according to the size of the proportion of the shear indices within and outside the preset threshold range, wherein each columnar proportion pattern presents the same color as the corresponding mark information.

14. The blood vessel wall shear index display method according to any one of claims 1 to 10, wherein, at least one or more to-be-tested positions are located in a preset region of interest, and the method further comprises: controlling a region-of-interest frame corresponding to the region of interest to be displayed; moving the region-of-interest frame and / or adjusting the size or shape of the region of interest in response to a user's adjustment operation; determining at least one or more updated positions of interest included in the region of interest frame after the movement and / or the resizing or the reshaping, and obtaining a shear index at each updated position of interest based on the ultrasound echo data within a preset time; displaying corresponding marker information at the updated position of interest according to a relationship between the shear index at the updated position of interest and a preset index standard.

15. The blood vessel wall shear index display method of claim 1, wherein, The determination of the blood vessel wall includes: finding a region with a brightness higher than a preset brightness threshold in the ultrasound image, and determining the region with the brightness higher than the preset brightness threshold as the blood vessel wall.

16. The blood vessel wall shear index display method of claim 1, wherein, The method further includes: when two or more types of shear indices are simultaneously obtained and displayed at the same position of interest, and when it is determined that at least two types of shear indices at the same position of interest are both outside a preset threshold range, controlling a specific marker to be displayed to indicate the position of interest, or controlling the marker information of the corresponding at least two types of shear indices at the position of interest to be presented in a specific color.

17. The blood vessel wall shear index display method of claim 1, wherein, The shear index includes a blood vessel wall shear stress, and the obtaining of the shear index at each position of interest based on the ultrasound echo data within a preset time includes: calculating the blood vessel wall shear stress based on a pulsed Doppler velocity measurement, or calculating the blood vessel wall shear stress based on a vector blood flow imaging method according to a vector velocity.

18. The blood vessel wall shear index display method of claim 17, wherein, The shear index further includes an oscillatory shear index, and the obtaining of the shear index at each position of interest based on the ultrasound echo data within a preset time further includes: calculating the oscillatory shear index according to an integral of the blood vessel wall shear stress within a cardiac cycle.

19. The blood vessel wall shear index display method of claim 1, wherein, The shear index further includes a blood vessel wall shear rate, and the obtaining of the shear index at each position of interest based on the ultrasound echo data within a preset time includes: obtaining a corresponding velocity component along a tangential direction of the blood vessel wall at each position of interest among one or more positions of interest on the blood vessel wall; obtaining a corresponding blood vessel wall shear rate at each position of interest within a preset time by taking a partial derivative of the velocity component along the tangential direction of the blood vessel wall at the respective position of interest with respect to a normal direction of the blood vessel wall pointing into the blood vessel at the respective position of interest.

20. An ultrasound imaging system, characterized by The ultrasound imaging system includes: a probe configured to emit ultrasound waves to a measured tissue containing a blood vessel, and to generate ultrasound echo data after receiving ultrasound echoes returned by the measured tissue; a processor connected to the probe, the processor being configured to execute a program stored in a memory to implement the blood vessel wall shear index display method according to any one of claims 1 to 19.

21. A computer-readable storage medium storing computer program instructions, wherein, The computer program instructions, when executed by a processor, implement the blood vessel wall shear index display method according to any one of claims 1 to 19.

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