Ultrasonic pulse wave imaging method, device, ultrasonic equipment and storage medium

Abstract

The present application discloses an ultrasonic pulse wave imaging method, device, ultrasonic equipment and storage medium, which are used to overcome the defect in the related art that the blood vessel cannot be evaluated in real time and locally at the same time. The present application scans the blood vessel scanning point by alternating between the M mode and the PW mode to obtain an ultrasonic echo signal, and determines the change information of the vessel wall position of the blood vessel scanning point corresponding to different time points by collecting the ultrasonic echo signal fed back by the M mode scanning, and determines the blood flow velocity information in the blood vessel scanning point corresponding to different time points by collecting the ultrasonic echo signal fed back by the PW mode scanning. Finally, according to the change information of the vessel wall position and the blood flow velocity information in the blood vessel, a pulse wave velocity image of the blood vessel is obtained, which can evaluate the pulse wave velocity in real time and locally, thereby making the estimation of the vessel wall elasticity more accurate.

Description

Technical Field

[0001] The present application relates to the field of ultrasonic imaging technology, and in particular to an ultrasonic pulse wave imaging method, device, ultrasonic equipment and storage medium. Background Art

[0002] Atherosclerosis is closely related to a variety of cardiovascular diseases. Atherosclerosis generally has an insidious onset and progresses slowly. In severe cases, it can lead to cardiovascular diseases such as heart disease, stroke, and cerebral thrombosis. Cardiovascular disease has now become the leading cause of death in the world, so the ability to accurately and reliably diagnose arterial elasticity early has important clinical significance for the detection, diagnosis, and treatment of cardiovascular disease. The arterial pulse wave originates in the left ventricle and propagates in the arterial tree as a pressure wave, causing the contraction and expansion of the vessel wall. The pulse wave velocity is recognized as one of the most reliable indicators for evaluating changes in vascular hardness, and has been relatively widely used in research and clinical practice.

[0003] In the related art, the pulse wave velocity measurement method generally records the distance between two arterial sites on the body surface and the propagation time of the pulse, and calculates the pulse wave velocity by the distance and time difference. This method has errors in distance measurement, and only estimates the rough average pulse wave velocity between the two recording points, and cannot evaluate the changes in the hardness of local blood vessels.

[0004] Moreover, the current ultrasonic pulse wave imaging method is based on ultra-fast imaging. It tracks the movement of the carotid artery through the Doppler imaging algorithm and directly calculates the pulse wave velocity at two time points: the beginning of the systolic phase and the beginning of the diastolic phase. However, this technology has very high requirements on the system and needs to collect a large amount of data. The large amount of calculation makes it impossible to obtain results in real time.

[0005] Therefore, in view of the fact that the related technologies cannot simultaneously take into account real-time and local assessment of blood vessels, providing a method that can overcome the shortcomings of the related technologies has become a concern of the industry. Summary of the invention

[0006] The purpose of the present application is to provide an ultrasonic pulse wave imaging method, apparatus, ultrasonic equipment and storage medium to overcome the defect in the related art that it is not possible to simultaneously evaluate blood vessels in real time and locally.

[0007] In a first aspect, the present application provides an ultrasonic pulse wave imaging method, the method comprising:

[0008] In response to a scan refresh instruction, the blood vessel scanning point is scanned in an alternating manner using the M mode and the PW mode according to the blood vessel position determined by the B mode scanning;

[0009] Collect the ultrasonic echo signal fed back by M-mode scanning to determine the change information of the vessel wall position corresponding to the vascular scanning point at different time points;

[0010] Collect the ultrasonic echo signal fed back by the PW mode scanning to determine the blood flow velocity information in the blood vessel corresponding to the vascular scanning point at different time points;

[0011] A pulse wave velocity image of the blood vessel is obtained according to the change information of the vessel wall position and the blood flow velocity information in the blood vessel.

[0012] In a possible implementation, according to the blood vessel position determined by B-mode scanning, the blood vessel scanning point is scanned by alternating M-mode and PW-mode, including:

[0013] In response to the scan refresh instruction, in a first scan cycle, the B mode is collected to perform a scan once, and the blood vessel position is determined according to the ultrasonic echo signal fed back from the scan;

[0014] In response to the scan refresh instruction, in a second scan cycle, an alternating scan of the M mode and the PW mode is performed by alternately transmitting an M mode ultrasonic signal to scan the first blood vessel scan point and a PW mode ultrasonic signal to scan the second blood vessel scan point at different time points;

[0015] The first scanning period and the second scanning period are scanning periods that do not overlap in time.

[0016] In a possible implementation, according to the blood vessel position determined by B-mode scanning, the blood vessel scanning point is scanned by alternating M-mode and PW-mode, including:

[0017] In the same scanning cycle, by alternately transmitting B-mode ultrasound to scan the blood vessel position, transmitting M-mode ultrasound signals to scan the first blood vessel scanning point, and transmitting PW-mode ultrasound signals to scan the second blood vessel scanning point at different time points, an alternating scan of B-mode, M-mode and PW-mode is performed.

[0018] In a possible implementation, the M-mode ultrasonic signal emitted at the same time point is a single-ray ultrasonic signal, the PW-mode ultrasonic signal emitted at the same time point is a single-ray ultrasonic signal, and there is an interval of at least one PW-mode ultrasonic signal emitted at a time point between two adjacent emitted M-mode ultrasonic signals; or

[0019] The M-mode ultrasonic signal emitted at the same time point is a multi-ray ultrasonic signal, and the PW-mode ultrasonic signal emitted at the same time point is a multi-ray ultrasonic signal, and there is an interval of at least one PW-mode ultrasonic signal emitted at a time point between two adjacent M-mode ultrasonic signals emitted.

[0020] In a possible implementation, transmitting an M-mode ultrasonic signal to scan the first blood vessel scanning point includes:

[0021] Based on the angle information between the blood vessel scanning point and the transmitted M-mode ultrasonic signal, determine to use the ultrasonic signal in the transmitted deflection mode or the non-deflection mode to scan the first blood vessel scanning point;

[0022] Transmitting a PW mode ultrasonic signal to scan the second blood vessel scanning point, including:

[0023] Based on the angle information between the blood vessel scanning point and the ultrasonic signal transmitted in the PW mode, it is determined whether to transmit the ultrasonic signal in the deflection mode or the non-deflection mode to scan the second blood vessel scanning point.

[0024] In a possible implementation manner, between two adjacent transmitted M-mode ultrasonic signals, there is an interval of at least one time point between transmitted PW-mode ultrasonic signals, including:

[0025] According to the first interval time PRF1 of the M mode and the second interval time PRF2 of the PW mode, the number of time points of transmitting the PW mode ultrasonic signal between two adjacent transmitted M mode ultrasonic signals is determined to be: floor(PRF2 / PRF1+1).

[0026] In a possible implementation, obtaining a pulse wave velocity image of a blood vessel according to the change information of the vessel wall position and the blood flow velocity information in the blood vessel specifically includes:

[0027] Determine a first change curve of the difference between the front wall and the back wall of the blood vessel over time according to the change information of the blood vessel wall, and take the logarithm of the first change curve to obtain a second change curve;

[0028] Determine a third variation curve of the blood flow velocity in the blood vessel over time within any cardiac cycle range according to the blood flow velocity information in the blood vessel;

[0029] Performing linear fitting processing on the second change curve and the third change curve within any cardiac cycle range to obtain the pulse wave velocity within the said any cardiac cycle range;

[0030] The pulse wave velocity of each cardiac cycle range is integrated to obtain a pulse wave velocity image of the blood vessels.

[0031] In a second aspect, the present application provides an ultrasonic pulse wave imaging device, the device comprising:

[0032] The ultrasound scanning module is configured to scan the blood vessel scanning point in an alternating manner of M mode and PW mode according to the blood vessel position determined by B mode scanning in response to the scan refresh instruction;

[0033] A first ultrasonic echo signal acquisition module is configured to acquire ultrasonic echo signals fed back by M-mode scanning to determine change information of the vessel wall position of the blood vessel scanning point corresponding to different time points;

[0034] The second ultrasonic echo signal acquisition module is configured to acquire ultrasonic echo signals fed back by the PW mode scanning, and determine the blood flow velocity information in the blood vessel corresponding to the blood vessel scanning points at different time points;

[0035] The pulse wave velocity imaging module is configured to obtain a pulse wave velocity image of the blood vessel according to the change information of the vessel wall position and the blood flow velocity information in the blood vessel.

[0036] In a possible implementation, according to the blood vessel position determined by B-mode scanning, the blood vessel scanning point is scanned in an alternating manner of M-mode and PW-mode, and the ultrasound scanning module is configured as follows:

[0037] In response to the scan refresh instruction, in a first scan cycle, the B mode is collected to perform a scan once, and the blood vessel position is determined according to the ultrasonic echo signal fed back from the scan;

[0038] In response to the scan refresh instruction, in a second scan cycle, an alternating scan of the M mode and the PW mode is performed by alternately transmitting an M mode ultrasonic signal to scan the first blood vessel scan point and a PW mode ultrasonic signal to scan the second blood vessel scan point at different time points;

[0039] The first scanning period and the second scanning period are scanning periods that do not overlap in time.

[0040] In a possible implementation, according to the blood vessel position determined by B-mode scanning, the blood vessel scanning point is scanned in an alternating manner of M-mode and PW-mode, and the ultrasound scanning module is configured as follows:

[0041] In the same scanning cycle, by alternately transmitting B-mode ultrasound to scan the blood vessel position, transmitting M-mode ultrasound signals to scan the first blood vessel scanning point, and transmitting PW-mode ultrasound signals to scan the second blood vessel scanning point at different time points, an alternating scan of B-mode, M-mode and PW-mode is performed.

[0042] In a possible implementation, the M-mode ultrasonic signal emitted at the same time point is a single-ray ultrasonic signal, the PW-mode ultrasonic signal emitted at the same time point is a single-ray ultrasonic signal, and there is an interval of at least one PW-mode ultrasonic signal emitted at a time point between two adjacent emitted M-mode ultrasonic signals; or

[0043] The M-mode ultrasonic signal emitted at the same time point is a multi-ray ultrasonic signal, and the PW-mode ultrasonic signal emitted at the same time point is a multi-ray ultrasonic signal, and there is an interval of at least one PW-mode ultrasonic signal emitted at a time point between two adjacent M-mode ultrasonic signals emitted.

[0044] In a possible implementation, an M-mode ultrasonic signal is transmitted to scan the first blood vessel scanning point, and the ultrasonic scanning module is configured as follows:

[0045] Based on the angle information between the blood vessel scanning point and the transmitted M-mode ultrasonic signal, determine to use the ultrasonic signal in the transmitted deflection mode or the non-deflection mode to scan the first blood vessel scanning point;

[0046] Transmitting a PW mode ultrasonic signal to scan the second blood vessel scanning point, including:

[0047] Based on the angle information between the blood vessel scanning point and the ultrasonic signal transmitted in the PW mode, it is determined whether to transmit the ultrasonic signal in the deflection mode or the non-deflection mode to scan the second blood vessel scanning point.

[0048] In a possible implementation, between two adjacent transmitted M-mode ultrasonic signals, there is an interval of at least one PW-mode ultrasonic signal transmitted at a time point, and the ultrasonic scanning module is configured as follows:

[0049] According to the first interval time PRF1 of the M mode and the second interval time PRF2 of the PW mode, the number of time points of transmitting the PW mode ultrasonic signal between two adjacent transmitted M mode ultrasonic signals is determined to be: floor(PRF2 / PRF1+1).

[0050] In a possible implementation, a pulse wave velocity image of a blood vessel is obtained according to the change information of the vessel wall position and the blood flow velocity information in the blood vessel, and the pulse wave imaging module is configured as follows:

[0051] A first change curve of the difference between the front wall and the back wall of the blood vessel changing with time is determined according to the change information of the blood vessel wall, and the logarithm of the first change curve is taken to obtain a second change curve.

[0052] A third variation curve of the blood flow velocity in the blood vessel varying with time within any cardiac cycle range is determined according to the blood flow velocity information in the blood vessel.

[0053] Performing linear fitting processing on the second change curve and the third change curve within any cardiac cycle range to obtain the pulse wave velocity within the said any cardiac cycle range;

[0054] The pulse wave velocity of each cardiac cycle range is integrated to obtain a pulse wave velocity image of the blood vessels.

[0055] In a third aspect, the present application provides an ultrasound device, comprising: a processor, a memory, a display unit, and a probe;

[0056] A probe, used for transmitting an ultrasonic signal;

[0057] A display unit, used for displaying ultrasound images;

[0058] The processor is connected to the probe and the display unit respectively, and is configured to implement the ultrasonic pulse wave imaging method as described in any one of the first aspects above.

[0059] In a fourth aspect, the present application provides a computer-readable storage medium. When instructions in the computer-readable storage medium are executed by a terminal device, the terminal device is enabled to execute the ultrasonic pulse wave imaging method as described in any one of the above-mentioned first aspects.

[0060] In a fifth aspect, the present application provides a computer program product, including a computer program:

[0061] When the computer program is executed by a processor, the ultrasonic pulse wave imaging method described in any one of the first aspects above is implemented.

[0062] The technical solution provided by the embodiments of the present application brings at least the following beneficial effects:

[0063] In the embodiment of the present application, the blood vessel scanning points are scanned alternately by adopting the M mode and the PW mode to obtain ultrasonic echo signals, and the ultrasonic echo signals fed back by the M mode scanning are collected to determine the change information of the vessel wall position of the blood vessel scanning points corresponding to different time points, and the ultrasonic echo signals fed back by the PW mode scanning are collected to determine the blood flow velocity information in the blood vessel scanning points corresponding to different time points. Finally, based on the change information of the vessel wall position and the blood flow velocity information in the blood vessel, a pulse wave velocity image of the blood vessel is obtained, which can evaluate the pulse wave velocity in real time and locally, thereby making the estimation of the vessel wall elasticity more accurate.

[0064] Other features and advantages of the present application will be described in the following description, and partly become apparent from the description, or be understood by practicing the present application. The purpose and other advantages of the present application can be realized and obtained by the structures specifically pointed out in the written description, claims, and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0065] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. Obviously, the drawings introduced below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0066] Figure 1 A schematic diagram of the framework of an ultrasound device provided in an embodiment of the present application;

[0067] Figure 2 A schematic diagram of the principle of realizing ultrasonic imaging by the ultrasonic device provided in an embodiment of the present application;

[0068] Figure 3 A schematic diagram of the overall process of ultrasonic pulse wave imaging provided in an embodiment of the present application;

[0069] Figure 4 A schematic diagram of a flow chart of a first scanning method in step 301 provided in an embodiment of the present application;

[0070] Figure 5 A schematic diagram of scanning using a B-mode scanning line in a first scanning cycle provided by an embodiment of the present application;

[0071] Figure 6 A schematic diagram of alternately scanning using M-mode scanning lines and PW-mode scanning lines in a second scanning cycle provided by an embodiment of the present application;

[0072] Figure 7 A schematic diagram of a second scanning method in step 301 provided in an embodiment of the present application;

[0073] Figure 8 A schematic diagram of an ultrasonic probe transmitting multiple scanning lines provided in an embodiment of the present application;

[0074] Fig. 9 A schematic diagram of an ultrasonic signal in a deflection mode provided in an embodiment of the present application;

[0075] Fig.10 A schematic diagram of an ultrasonic signal in a non-deflection mode provided in an embodiment of the present application;

[0076] Fig.11 A schematic diagram of an ultrasonic signal in a deflection mode provided in an embodiment of the present application;

[0077] Fig.12 A flowchart of step 304 provided in an embodiment of the present application;

[0078] Fig.13 A schematic diagram of the vertical arrangement of B images, M images and PW images provided in an embodiment of the present application;

[0079] Fig.14 A schematic diagram of the left-right arrangement of B images, M images, and PW images provided in an embodiment of the present application;

[0080] Fig.15 A schematic diagram of the envelope of the M image provided in an embodiment of the present application;

[0081] Fig.16 A schematic diagram of the envelope of a PW image provided in an embodiment of the present application;

[0082] Fig.17 A schematic diagram of segmenting a PW scan line provided in an embodiment of the present application;

[0083] Fig.18 A schematic diagram of the second step of the process of converting a PW signal into a PW graph provided in an embodiment of the present application;

[0084] Fig.19 A schematic diagram of the third step of the process of converting a PW signal into a PW graph provided in an embodiment of the present application;

[0085] Fig. 20 A schematic diagram of the structure of a video image motion estimation device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0086] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Among them, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0087] Furthermore, in the description of the embodiments of the present application, unless otherwise specified, “ / ” means or. For example, A / B can mean A or B. The “and / or” in the text is merely a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, “multiple” refers to two or more than two.

[0088] In the following, the terms "first" and "second" are used for descriptive purposes only and should not be understood as suggesting or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, unless otherwise specified, "multiple" means two or more.

[0089] In the related technology, in the measurement of pulse wave velocity, there is mainly a surface measurement method, which cannot obtain local pulse wave velocity results, and a pulse wave velocity measurement method based on ultrasonic rapid imaging, which requires the collection of a large amount of data and has a large amount of calculation, so it is impossible to evaluate the pulse wave in real time.

[0090] In view of this, the present application provides an ultrasonic pulse wave imaging method, apparatus, ultrasonic equipment and storage medium to solve and overcome the defects of the related art.

[0091] The inventive concept of the present application can be summarized as follows: the present application obtains ultrasonic echo signals by scanning blood vessel scanning points in an alternating manner of M mode and PW mode, and determines the change information of the vessel wall position of the blood vessel scanning points corresponding to different time points by collecting ultrasonic echo signals fed back by M mode scanning, and determines the blood flow velocity information in the blood vessel scanning points corresponding to different time points by collecting ultrasonic echo signals fed back by PW mode scanning. Finally, according to the change information of the vessel wall position and the blood flow velocity information in the blood vessel, a pulse wave velocity image of the blood vessel is obtained, which can evaluate the pulse wave velocity in real time and locally, thereby making the estimation of the vessel wall elasticity more accurate.

[0092] After introducing the main inventive ideas of the embodiments of the present application, the following briefly introduces the application scenarios to which the technical solutions of the embodiments of the present application can be applied. It should be noted that the application scenarios introduced below are only used to illustrate the embodiments of the present application and are not limited. In specific implementation, the technical solutions provided by the embodiments of the present application can be flexibly applied according to actual needs.

[0093] See also Figure 1 , which is a structural block diagram of the ultrasonic device provided in an embodiment of the present application.

[0094] It should be understood that Figure 1 The ultrasound device 100 shown is only one example, and the ultrasound device 100 may have more Figure 1 The more or less components shown in the figure can be combined with two or more components, or can have different component configurations. The various components shown in the figure can be implemented in hardware, software, or a combination of hardware and software including one or more signal processing and / or application specific integrated circuits.

[0095] Figure 1 Schematically shows a hardware configuration block diagram of the ultrasound apparatus 100 according to an exemplary embodiment.

[0096] like Figure 1 As shown, the ultrasound device 100 may include, for example: a processor 110, a memory 120, a display unit 130 and a probe 140; wherein,

[0097] A probe 140, used for transmitting an ultrasonic signal;

[0098] A display unit 130, configured to display the pulse wave velocity image;

[0099] The memory 120 is configured to store data required for ultrasound imaging, which may include software programs, application interface data, etc.;

[0100] The processor 110 is connected to the probe 140 , the display unit 130 and the memory 120 respectively, and is configured to execute the ultrasonic pulse wave imaging method provided in the present application.

[0101] Figure 2 Schematic diagram of the application principle according to an embodiment of the present application. Figure 1 The partial modules or functional components of the ultrasonic device shown are implemented, and only the main components will be described below, while other components, such as memory, controller, control circuit, etc., will not be described here in detail.

[0102] like Figure 2 As shown, the application environment may include a user interface 210 , a display unit 220 for displaying the user interface, and a processor 230 .

[0103] The display unit 220 may include a display panel 221 and a backlight assembly 222. The display panel 221 is configured to display an ultrasound image, the backlight assembly 222 is located behind the display panel 221, and the backlight assembly 222 may include a plurality of backlight partitions (not shown in the figure), each of which may emit light to illuminate the display panel 221.

[0104] The processor 230 may be configured to control the brightness of the backlight source of each backlight partition in the backlight assembly 222 , and to control the probe to transmit an ultrasonic signal and receive an ultrasonic echo signal.

[0105] The processor 230 may process the ultrasonic echo signal to determine an ultrasonic image. To facilitate understanding of the ultrasonic pulse wave imaging method provided in the embodiment of the present application, the method is further described below in conjunction with the accompanying drawings.

[0106] In a possible implementation, the present application provides an ultrasonic pulse wave imaging method, the overall flow chart of which is as follows: Figure 3 As shown, including the following:

[0107] In step 301, in response to a scan refresh instruction, the blood vessel scanning point is scanned in an alternating manner using the M mode and the PW mode according to the blood vessel position determined by the B mode scanning.

[0108] In step 302, ultrasonic echo signals fed back by M-mode scanning are collected to determine the change information of the vessel wall position of the blood vessel scanning points corresponding to different time points.

[0109] In step 303, the ultrasonic echo signal fed back by the PW mode scanning is collected to determine the blood flow velocity information in the blood vessel corresponding to the blood vessel scanning points at different time points.

[0110] In step 304, a pulse wave velocity image of the blood vessel is obtained based on the change information of the vessel wall position and the blood flow velocity information in the blood vessel.

[0111] In a possible implementation, in step 301, according to the blood vessel position determined by the B-mode scanning, the blood vessel scanning point is scanned by alternating the M-mode and the PW-mode. The present application provides two scanning modes. The first scanning mode is: the user selects to scan the target area, firstly the blood vessel position is determined by the B-mode scanning, and then the blood vessel scanning point is scanned by alternating the M-mode and the PW-mode. The two scans are performed in different scanning cycles. The specific flow chart is as follows: Figure 4 As shown, including the following:

[0112] In step 401, in response to a scan refresh instruction, a scan is performed once in the B mode within a first scan cycle, and the location of the blood vessel is determined based on the ultrasonic echo signal fed back from the scan.

[0113] In step 402, in response to the scan refresh instruction, within the second scan cycle, an alternating scan of the M mode and the PW mode is performed by alternately transmitting an M mode ultrasonic signal to scan the first blood vessel scanning point and a PW mode ultrasonic signal to scan the second blood vessel scanning point at different time points.

[0114] It should be noted that the first scanning period and the second scanning period are scanning periods that do not overlap in time.

[0115] For example, Figure 5 and Figure 6 As shown in the figure, the ultrasound probe transmits ultrasound signals to the target area. The first solid line is the B-mode scanning line, the first dotted line is the M-mode scanning line, and the second dotted line is the PW-mode scanning line. The area where the two oblique lines are located is the blood vessel. In the first scanning cycle, the B-mode scanning line is used to scan once, as shown in the figure. Figure 5 The solid line emitted by the ultrasound probe in the image is used to determine the location of the blood vessel based on the ultrasound echo signal fed back from the scan. Figure 5After the blood vessel position is determined in the area where the two oblique lines are located, in the second scanning cycle, the ultrasonic signal of the M mode scanning line is alternately emitted to scan the first blood vessel scanning point and the ultrasonic signal of the PW mode scanning line is alternately emitted to scan the second blood vessel scanning point at different time points, and an alternating scan of the M mode scanning line and the PW mode scanning line is performed, such as Figure 6 The two dotted lines emitted by the ultrasound probe in the image are as follows: the first vascular scanning point and the second vascular scanning point are the positions where the two dotted lines intersect the oblique line. The alternating order can be performed in the manner of M1->PW1->M2->PW2..., that is, the M mode scanning line and the PW mode scanning line are scanned alternately, and the order of the M mode scanning line and the PW mode scanning line can be adjusted according to needs.

[0116] In another possible implementation, in step 301, according to the blood vessel position determined by the B-mode scanning, the blood vessel scanning point is scanned in an alternating manner using the M-mode and the PW-mode. The present application provides a second scanning method in which the user selects to scan the target area, and in the same scanning cycle, the blood vessel scanning point is scanned in an alternating manner using the B-mode, the M-mode and the PW-mode. The specific process includes the following contents:

[0117] In the same scanning cycle, by alternately transmitting B-mode ultrasound to scan the blood vessel position, transmitting M-mode ultrasound signals to scan the first blood vessel scanning point, and transmitting PW-mode ultrasound signals to scan the second blood vessel scanning point at different time points, an alternating scan of B-mode, M-mode and PW-mode is performed.

[0118] For example, Figure 7 As shown, the ultrasonic probe transmits ultrasonic signals to the target area, the first solid line is the B-mode scanning line, the first dotted line is the M-mode scanning line, the second dotted line is the PW-mode scanning line, and the area where the two oblique lines are located is the blood vessel. In the same scanning cycle, at different time points, the B-mode ultrasonic wave is alternately emitted to scan the blood vessel position, the M-mode ultrasonic wave signal is emitted to scan the first blood vessel scanning point, and the PW-mode ultrasonic wave signal is emitted to scan the second blood vessel scanning point. The alternating order of the above three scanning lines can be performed in the manner of B1->B2->B3...Bk->M1->M2...->Mm->B1->B2->B3...Bk->PW1->PW2...->PWn..., that is, the scanning is alternately performed in the order of B-mode scanning line, M-mode scanning line, B-mode scanning line, and PW-mode scanning line.

[0119] For the above two scanning methods, this application is also divided into single-ray and multi-ray cases, that is, single scanning line and multi-scanning line. Among them, if the ultrasonic probe emits a single scanning line:

[0120] The M-mode ultrasonic signal emitted at the same time point is a single-ray ultrasonic signal, and the PW-mode ultrasonic signal emitted at the same time point is a single-ray ultrasonic signal. There is an interval of at least one PW-mode ultrasonic signal emitted at a time point between two adjacent M-mode ultrasonic signals emitted.

[0121] As above Figure 7 As shown, corresponding to the case where the ultrasonic probe transmits a single scanning line, the M mode scanning line and the PW mode scanning line are both one, which will not be described in detail in this application.

[0122] If the ultrasound probe transmits multiple scan lines:

[0123] The M-mode ultrasonic signal emitted at the same time point is a multi-ray ultrasonic signal, and the PW-mode ultrasonic signal emitted at the same time point is a multi-ray ultrasonic signal, and there is an interval of at least one PW-mode ultrasonic signal emitted at a time point between two adjacent M-mode ultrasonic signals emitted.

[0124] like Figure 8 As shown, the ultrasound probe transmits ultrasound signals to the target area, the first solid line is the B-mode scanning line, the first dotted line is the M-mode scanning line, the second dotted line is the PW-mode scanning line, and the area where the two oblique lines are located is the blood vessel. The alternating order of the M-mode scanning line and the PW-mode scanning line can be performed in the manner of M1->PW1->PW2...->PWn->M2->PWn+1->PWn+2->PWn+3..., that is, multiple PW-mode scanning lines are inserted between two adjacent M-mode scanning lines.

[0125] In a possible implementation manner, the PW mode ultrasonic signal transmitted at least one time point between two adjacent transmitted M mode ultrasonic signals includes the following contents:

[0126] According to the first interval time PRF1 of the M mode and the second interval time PRF2 of the PW mode, the number of time points of transmitting the PW mode ultrasonic signal between two adjacent transmitted M mode ultrasonic signals is determined to be: floor(PRF2 / PRF1+1).

[0127] In a possible implementation, in step 402, transmitting an M-mode ultrasonic signal to scan the first blood vessel scanning point includes the following contents:

[0128] Based on the angle information between the blood vessel scanning point and the transmitted M-mode ultrasonic signal, it is determined whether to transmit the ultrasonic signal in the deflection mode or the non-deflection mode to scan the first blood vessel scanning point.

[0129] Similarly, in step 402, transmitting an ultrasonic signal in a PW mode to scan the second blood vessel scanning point includes the following contents:

[0130] Based on the angle information between the blood vessel scanning point and the ultrasonic signal transmitted in the PW mode, it is determined whether to transmit the ultrasonic signal in the deflection mode or the non-deflection mode to scan the second blood vessel scanning point.

[0131] The ultrasonic signals in deflection mode or non-deflection mode are respectively as follows: Fig. 9 and Fig.10 As shown in the figure, the first dotted line is the M mode scanning line, the second dotted line is the PW mode scanning line, and the area where the two oblique lines are located is the blood vessel. In order to achieve a better scanning effect, the optimal angle between the blood vessel scanning point and the scanning line is about 60 degrees.

[0132] It should be added that, regardless of the multiple scan lines emitted by the ultrasound probe, the deflection angles of the multiple scan lines in the same mode are the same, regardless of the deflection mode or the non-deflection mode. Figure 8 For multiple scan lines in non-deflected mode, such as Fig.11 Multiple scan lines for deflection mode.

[0133] In a possible implementation, in step 304, a pulse wave velocity image of the blood vessel is obtained based on the change information of the vessel wall position and the blood flow velocity information in the blood vessel. The flow chart is as follows: Fig.12 As shown, specifically including the following:

[0134] In step 1201, a first variation curve of the difference between the front wall and the back wall of the blood vessel varying with time is determined according to the variation information of the blood vessel wall, and the logarithm of the first variation curve is taken to obtain a second variation curve.

[0135] In step 1202, a third variation curve of the intravascular blood flow velocity versus time within any cardiac cycle range is determined based on the intravascular blood flow velocity information.

[0136] In step 1203, linear fitting processing is performed on the second change curve and the third change curve within any cardiac cycle range to obtain the pulse wave velocity within any cardiac cycle range.

[0137] In step 1204, the pulse wave velocities in each cardiac cycle range are integrated to obtain a pulse wave velocity image of the blood vessel.

[0138] For example, the obtained B picture, M picture and PW picture are as follows Fig.13 and Fig.14 As shown, the image layout supports Fig.13 The top and bottom arrangement shown in the figure are B picture, M picture and PW picture from top to bottom. Fig.14As shown in the left and right arrangement, the left side is the B image, the upper right is the M image, and the lower right is the PW image. Among them, the B image is obtained by a series of signal processing processes such as demodulation, filtering, and dynamic range conversion of the ultrasonic echo signal fed back by the B mode scanning, the M image is obtained by a series of signal processing processes such as demodulation, filtering, and dynamic range conversion of the ultrasonic echo signal fed back by the M mode scanning, and the PW image is obtained by segmenting the ultrasonic echo signal fed back by the PW mode scanning and performing signal processing such as demodulation, filtering, and Fourier transform on each segment of the signal.

[0139] Determine the blood vessel position based on the B image; process the M image and use the envelope algorithm to obtain the envelope of the M image, such as Fig.13 or Fig.14 The light-colored wavy line in the M image is the envelope line. The M image obtained by using the envelope algorithm is as follows: Fig.15 As shown in FIG. 1 , the line on the edge of the light-colored wavy line is the envelope line (the envelope line can also be displayed in other colors, such as red, etc.). The envelope line includes the results of the anterior wall and the posterior wall of the carotid artery. The change information of the wall position of the vascular scanning point corresponding to different time points is determined according to the envelope line. The PW image is processed, and the envelope algorithm is used to perform envelope processing on the spectrum data of the PW image to obtain the envelope line of the PW mode, as shown in FIG. Fig.13 or Fig.14 The upper edge of the light-colored spectrum in the PW image is the envelope line. The PW image obtained by using the envelope algorithm is as follows: Fig.16 As shown, the upper edge of the light-colored spectrum is the envelope ( Fig.16 Grayscale processing is performed and the envelope is not clearly displayed), and the blood flow velocity information in the blood vessel corresponding to the blood vessel scanning points at different time points is determined based on the envelope.

[0140] get Fig.15 as well as Fig.16 The envelope information in the image is obtained, that is, the change information of the vessel wall position and the blood flow velocity information in the blood vessel are obtained. After that, according to the above steps 1201 to 1204, the pulse wave velocity image of the blood vessel is finally obtained.

[0141] It should be added that, taking the PW scanning line as an example, the ultrasonic echo signal fed back by the PW mode scanning is obtained as mentioned above. Fig.13 or Fig.14 The process of PW image includes the following:

[0142] For a PW scanning line, obtain the ultrasonic echo signal of the scanning feedback of the PW scanning line. Assume that the ultrasonic echo signal of the scanning feedback of a PW scanning line is 40 points, such as Fig.17 As shown, the segmentation processing is to divide the signal into four equal segments, each segment of the signal includes 10 points.

[0143] In addition, the ultrasonic echo signal corresponding to any PW mode scanning line is processed in segments, including:

[0144] The following formula (1) is used to determine the number of segmented signals for segmenting the ultrasonic echo signal corresponding to any PW mode scanning line:

[0145]

[0146] Among them, GapNum represents the number of segmented signals, PointNum represents the number of points in any PW mode scan line, Len represents the number of points in any segmented signal, and GapSize represents the number of interval points between any two segmented signals.

[0147] The conversion of the PW signal into a PW graph (i.e., a PW spectrum graph) is divided into three steps. The first step is to perform the segmentation processing as described above on the ultrasonic echo signal of the scan feedback of each PW scan line. For example, if the ultrasonic echo signal of the scan feedback of one PW scan line is 40 points, then each segment of the signal corresponds to 10 points. The second step is to perform the segmentation processing as described above on the ultrasonic echo signal of the scan feedback of each PW scan line. Fig.18 As shown, the 10 points of each signal segment are averaged, that is, one value is used to replace the 10 values ​​corresponding to each signal segment, and the ultrasonic echo signal of the scanning feedback of each PW scanning line is divided into M segments, for example, M is 4, and the ultrasonic echo signal of the scanning feedback of the acquired N PW scanning lines is averaged to obtain M*N points; the third step, as shown in Fig.19 As shown, for any 1*N points corresponding to a segmented signal, data selection is performed according to the step and the number of points used for FFT, so as to obtain the above Fig.13 or Fig.14 For example, if N is 1000, the step is 64, and the number of points used for FFT is 128, then the points used for the first spectrum line generated are from the 1st to the 128th points. The spectrum corresponds to the above Fig.13 or Fig.14 The first column of the PW image in the next spectrum line uses the 65th to 192th points, and so on, as shown above. Fig.13 or Fig.14 PW image in.

[0148] It should be noted that one cardiac cycle corresponds to one peak to the next peak or one trough to the next trough, and therefore, it is necessary to integrate the pulse wave velocity within each cardiac cycle range to obtain a pulse wave velocity image of the blood vessel.

[0149] In a possible implementation, the above Fig.13 or Fig.14 After obtaining the PW image in the image, the process of obtaining the pulse wave velocity image of the blood vessel includes:

[0150] Using the envelope information of a certain signal segment in the PW mode (i.e. the above Fig.13 or Fig.14 The envelope of the PW image in the image is obtained by calculating the characteristic points (i.e., the position points corresponding to the crest or trough of the envelope) after parameter calculation. The data range of the corresponding M-mode envelope (i.e., the cardiac cycle) is obtained according to the characteristic point information. The data within the range is processed by first directly subtracting the envelopes of the anterior wall and the posterior wall obtained by the M-mode to obtain the curve of the change of the carotid artery diameter over time (i.e., the first change curve), then taking the logarithm to obtain the second change curve, and at the same time linearly fitting with the velocity change curve represented by the envelope in the same cardiac cycle in the PW image obtained according to the characteristic point information (i.e., the third change curve), thereby obtaining the pulse wave velocity within a certain signal segment range. The above processing is performed on each signal segment of the PW signal to obtain the pulse wave velocity distribution of the PW scanning line, and then the above processing is performed on each M line and PW line to obtain the pulse wave velocity distribution map in the entire imaging area (i.e., the blood vessel).

[0151] In summary, the present application scans the blood vessel scanning points in an alternating manner of M mode and PW mode to obtain ultrasonic echo signals, and determines the change information of the vessel wall position of the blood vessel scanning points corresponding to different time points by collecting the ultrasonic echo signals fed back by the M mode scanning, and determines the blood flow velocity information in the blood vessel scanning points corresponding to different time points by collecting the ultrasonic echo signals fed back by the PW mode scanning. Finally, based on the change information of the vessel wall position and the blood flow velocity information in the blood vessel, a pulse wave velocity image of the blood vessel is obtained, which can evaluate the pulse wave velocity in real time and locally, thereby making the estimation of the vessel wall elasticity more accurate.

[0152] Based on the same inventive concept, the present application also provides an ultrasound image enhancement device, such as Fig. 20 As shown, the device 2000 includes:

[0153] The ultrasound scanning module 2001 is configured to scan the blood vessel scanning point in an alternating manner of M mode and PW mode according to the blood vessel position determined by B mode scanning in response to the scan refresh instruction;

[0154] The first ultrasonic echo signal acquisition module 2002 is configured to acquire ultrasonic echo signals fed back by M-mode scanning and determine the change information of the vessel wall position of the blood vessel scanning point corresponding to different time points;

[0155] The second ultrasonic echo signal acquisition module 2003 is configured to acquire ultrasonic echo signals fed back by the PW mode scanning, and determine the blood flow velocity information in the blood vessel corresponding to the blood vessel scanning points at different time points;

[0156] The pulse wave velocity imaging module 2004 is configured to obtain a pulse wave velocity image of the blood vessel according to the change information of the vessel wall position and the blood flow velocity information in the blood vessel.

[0157] In a possible implementation, according to the blood vessel position determined by B-mode scanning, the blood vessel scanning point is scanned in an alternating manner of M-mode and PW-mode, and the ultrasound scanning module is configured as follows:

[0158] In response to the scan refresh instruction, in a first scan cycle, the B mode is collected to perform a scan once, and the blood vessel position is determined according to the ultrasonic echo signal fed back from the scan;

[0159] In response to the scan refresh instruction, in a second scan cycle, an alternating scan of the M mode and the PW mode is performed by alternately transmitting an M mode ultrasonic signal to scan the first blood vessel scan point and a PW mode ultrasonic signal to scan the second blood vessel scan point at different time points;

[0160] The first scanning period and the second scanning period are scanning periods that do not overlap in time.

[0161] In a possible implementation, according to the blood vessel position determined by B-mode scanning, the blood vessel scanning point is scanned in an alternating manner of M-mode and PW-mode, and the ultrasound scanning module is configured as follows:

[0162] In the same scanning cycle, by alternately transmitting B-mode ultrasound to scan the blood vessel position, transmitting M-mode ultrasound signals to scan the first blood vessel scanning point, and transmitting PW-mode ultrasound signals to scan the second blood vessel scanning point at different time points, an alternating scan of B-mode, M-mode and PW-mode is performed.

[0163] In a possible implementation, the M-mode ultrasonic signal emitted at the same time point is a single-ray ultrasonic signal, the PW-mode ultrasonic signal emitted at the same time point is a single-ray ultrasonic signal, and there is an interval of at least one PW-mode ultrasonic signal emitted at a time point between two adjacent emitted M-mode ultrasonic signals; or

[0164] The M-mode ultrasonic signal emitted at the same time point is a multi-ray ultrasonic signal, and the PW-mode ultrasonic signal emitted at the same time point is a multi-ray ultrasonic signal, and there is an interval of at least one PW-mode ultrasonic signal emitted at a time point between two adjacent M-mode ultrasonic signals emitted.

[0165] In a possible implementation, an M-mode ultrasonic signal is transmitted to scan the first blood vessel scanning point, and the ultrasonic scanning module is configured as follows:

[0166] Based on the angle information between the blood vessel scanning point and the transmitted M-mode ultrasonic signal, determine to use the ultrasonic signal in the transmitted deflection mode or the non-deflection mode to scan the first blood vessel scanning point;

[0167] Transmitting a PW mode ultrasonic signal to scan the second blood vessel scanning point, including:

[0168] Based on the angle information between the blood vessel scanning point and the ultrasonic signal transmitted in the PW mode, it is determined whether to transmit the ultrasonic signal in the deflection mode or the non-deflection mode to scan the second blood vessel scanning point.

[0169] In a possible implementation, between two adjacent transmitted M-mode ultrasonic signals, there is an interval of at least one PW-mode ultrasonic signal transmitted at a time point, and the ultrasonic scanning module is configured as follows:

[0170] According to the first interval time PRF1 of the M mode and the second interval time PRF2 of the PW mode, the number of time points of transmitting the PW mode ultrasonic signal between two adjacent transmitted M mode ultrasonic signals is determined to be: floor(PRF2 / PRF1+1).

[0171] In a possible implementation, a pulse wave velocity image of a blood vessel is obtained according to the change information of the vessel wall position and the blood flow velocity information in the blood vessel, and the pulse wave imaging module is configured as follows:

[0172] A first change curve of the difference between the front wall and the back wall of the blood vessel changing with time is determined according to the change information of the blood vessel wall, and the logarithm of the first change curve is taken to obtain a second change curve.

[0173] A third variation curve of the blood flow velocity in the blood vessel varying with time within any cardiac cycle range is determined according to the blood flow velocity information in the blood vessel.

[0174] Performing linear fitting processing on the second change curve and the third change curve within any cardiac cycle range to obtain the pulse wave velocity within the said any cardiac cycle range;

[0175] The pulse wave velocity of each cardiac cycle range is integrated to obtain a pulse wave velocity image of the blood vessels.

[0176] In an exemplary embodiment, the present application further provides a computer-readable storage medium including instructions, such as a memory 120 including instructions, and the instructions can be executed by the processor 110 of the ultrasound device 100 to complete the above-mentioned ultrasound image enhancement method. Optionally, the computer-readable storage medium can be a non-transitory computer-readable storage medium, for example, the non-transitory computer-readable storage medium can be a ROM, a random access memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, etc.

[0177] In an exemplary embodiment, a computer program product is also provided, including a computer program, and when the computer program is executed by the processor 110, the method for enhancing and estimating an ultrasound image as provided in the present application is implemented.

[0178] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0179] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0180] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0181] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0182] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. An ultrasonic device, characterized in that: include: processor, memory, display unit and probe; A probe, for transmitting an ultrasonic signal; A display unit, used for displaying ultrasound images; A processor is connected to the probe and the display unit respectively, and is configured to: In response to a scan refresh instruction, the blood vessel scanning point is scanned in an alternating manner using the M mode and the PW mode according to the blood vessel position determined by the B mode scanning; Collect the ultrasonic echo signal fed back by M-mode scanning to determine the change information of the vessel wall position corresponding to the vascular scanning point at different time points; Collect the ultrasonic echo signal fed back by the PW mode scanning to determine the blood flow velocity information in the blood vessel corresponding to the vascular scanning point at different time points; A pulse wave velocity image of the blood vessel is obtained according to the change information of the vessel wall position and the blood flow velocity information in the blood vessel.

2. The ultrasonic device according to claim 1, characterized in that When the processor scans the blood vessel scanning point in an alternating manner of M mode and PW mode according to the blood vessel position determined by B mode scanning, the processor is specifically configured as follows: In response to the scan refresh instruction, in a first scan cycle, the B mode is collected to perform a scan once, and the blood vessel position is determined according to the ultrasonic echo signal fed back from the scan; In response to the scan refresh instruction, in a second scan cycle, an alternating scan of the M mode and the PW mode is performed by alternately transmitting an M mode ultrasonic signal to scan the first blood vessel scan point and a PW mode ultrasonic signal to scan the second blood vessel scan point at different time points; The first scanning period and the second scanning period are scanning periods that do not overlap in time.

3. The ultrasonic device according to claim 1, characterized in that When the processor scans the blood vessel scanning point in an alternating manner of M mode and PW mode according to the blood vessel position determined by B mode scanning, the processor is specifically configured as follows: In the same scanning cycle, by alternately transmitting B-mode ultrasound to scan the blood vessel position, transmitting M-mode ultrasound signals to scan the first blood vessel scanning point, and transmitting PW-mode ultrasound signals to scan the second blood vessel scanning point at different time points, an alternating scan of B-mode, M-mode and PW-mode is performed.

4. The ultrasonic device according to claim 2 or 3, characterized in that: The M-mode ultrasonic signal emitted at the same time point is a single-ray ultrasonic signal, the PW-mode ultrasonic signal emitted at the same time point is a single-ray ultrasonic signal, and there is at least one time point between two adjacent emitted M-mode ultrasonic signals and the emission of a PW-mode ultrasonic signal; or The M-mode ultrasonic signal emitted at the same time point is a multi-ray ultrasonic signal, and the PW-mode ultrasonic signal emitted at the same time point is a multi-ray ultrasonic signal. There is at least one time point between two adjacent M-mode ultrasonic signals emitted and a PW-mode ultrasonic signal emitted.

5. The ultrasonic device according to claim 2 or 3, characterized in that: When the processor transmits an M-mode ultrasonic signal to scan the first blood vessel scanning point, the processor is specifically configured as follows: Based on the angle information between the blood vessel scanning point and the transmitted M-mode ultrasonic signal, determine to use the ultrasonic signal in the transmitted deflection mode or the non-deflection mode to scan the first blood vessel scanning point; When the processor transmits an ultrasonic signal in a PW mode to scan the second blood vessel scanning point, the processor is specifically configured as follows: Based on the angle information between the blood vessel scanning point and the ultrasonic signal transmitted in the PW mode, it is determined whether to transmit the ultrasonic signal in the deflection mode or the non-deflection mode to scan the second blood vessel scanning point.

6. The ultrasonic device according to claim 4, characterized in that When the processor transmits a PW mode ultrasonic signal at least one time point between two consecutive M mode ultrasonic signals, the processor is specifically configured as follows: According to the first interval time PRF1 of the M mode and the second interval time PRF2 of the PW mode, the number of time points of transmitting the PW mode ultrasonic signal between two adjacent transmitted M mode ultrasonic signals is determined as follows: 。 7. The ultrasonic device according to claim 1, characterized in that When the processor obtains the pulse wave velocity image of the blood vessel according to the change information of the tube wall position and the blood flow velocity information in the blood vessel, the processor is specifically configured as follows: Determine a first change curve of the difference between the front wall and the back wall of the blood vessel over time according to the change information of the blood vessel wall, and take the logarithm of the first change curve to obtain a second change curve; Determine a third variation curve of the blood flow velocity in the blood vessel over time within any cardiac cycle range according to the blood flow velocity information in the blood vessel; Performing linear fitting processing on the second change curve and the third change curve within any cardiac cycle range to obtain the pulse wave velocity within the said any cardiac cycle range; The pulse wave velocity of each cardiac cycle range is integrated to obtain a pulse wave velocity image of the blood vessels.

8. An ultrasonic pulse wave imaging device, characterized in that: The device comprises: The ultrasound scanning module is configured to scan the blood vessel scanning point in an alternating manner of M mode and PW mode according to the blood vessel position determined by B mode scanning in response to the scan refresh instruction; A first ultrasonic echo signal acquisition module is configured to acquire ultrasonic echo signals fed back by M-mode scanning to determine change information of the vessel wall position of the blood vessel scanning point corresponding to different time points; The second ultrasonic echo signal acquisition module is configured to acquire ultrasonic echo signals fed back by the PW mode scanning, and determine the blood flow velocity information in the blood vessel corresponding to the blood vessel scanning points at different time points; The pulse wave velocity imaging module is configured to obtain a pulse wave velocity image of the blood vessel according to the change information of the vessel wall position and the blood flow velocity information in the blood vessel.

Images