Imaging control apparatus, medical imaging apparatus, imaging parameter setting method, and program

Abstract

To provide an imaging control device, a medical imaging device, an imaging parameter setting method, and a program for achieving adjustment of an imaging parameter suitable for change of biological information.SOLUTION: An imaging control device acquires biological information of a subject, determines whether or not it is necessary to adjust a second imaging parameter when a second set value based on the biological information of the subject is changed with respect to a first set value set in advance for a first imaging parameter in which the biological information of the subject is set, and displays parameter adjustment proposal information regarding adjustment of the second imaging parameter when it is determined that it is necessary to adjust the second imaging parameter.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to an imaging control device, a medical image imaging device, an imaging parameter setting method, and a program. [Background technology]

[0002] Medical imaging devices are known that perform imaging synchronized with biological signals that represent biological information such as heartbeat and respiration. For example, an MRI device monitors the heartbeat when imaging the heart, and measures MR signals synchronized with the heartbeat. MRI is an abbreviation for Magnetic Resonance Imaging. MR is also an abbreviation for Magnetic Resonance.

[0003] Patent Document 1 describes an MRI device that supports the setting of synchronization parameters related to synchronized imaging in synchronized imaging synchronized with biological signals. The device described in this document monitors the biological signals of a subject to be imaged and displays an image in which waveforms of the biological signals generated from the biological signals are superimposed on synchronization parameters set by an operator. MRI is an abbreviation for Magnetic Resonance Imaging.

[0004] Patent Document 2 describes an MRI device that performs imaging of a subject in synchronization with the subject's biological information. The device described in this document calculates a predicted SAR value based on the cycle of the biological information, and if the predicted SAR value exceeds a limit value, presents multiple suggested changes to the imaging conditions that will prevent the SAR from exceeding the limit. Note that SAR is an abbreviation for Specific Absorption Rate, which represents the amount of radio-frequency magnetic field pulse absorbed per unit time and unit mass. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2012-147921 [Patent Document 2] International Publication No. 2015 / 093296 Summary of the Invention [Problem to be solved by the invention]

[0006] However, in imaging synchronized with biological information, if the biological information changes significantly, it may be necessary to change imaging parameters related to the biological information. There are many imaging parameters related to the biological information. Changing many imaging parameters is time-consuming. In particular, manually changing imaging parameters is troublesome and complicated.

[0007] Patent Document 1 does not describe or suggest a change in imaging parameters due to a change in biological information. Patent Document 2 describes a proposal to change imaging parameters so that the SAR does not exceed the limit value when the SAR exceeds the limit value, but does not describe or suggest a change in imaging parameters due to a change in biological information.

[0008] The present disclosure has been made in consideration of these circumstances, and aims to provide an imaging control device, a medical image imaging device, an imaging parameter setting method, and a program that enable desirable adjustment of imaging parameters due to changes in biometric information. [Means for solving the problem]

[0009] An imaging control device according to a first aspect of the present disclosure is an imaging control device that sets imaging parameters to be applied to imaging for a medical imaging device that performs imaging of a subject, including a synchronous imaging task in which the subject's biometric information is used, and includes a processor and a memory that stores a program to be executed by the processor. The processor acquires the subject's biometric information, and, when a second setting value based on the acquired biometric information of the subject has been changed from a first setting value that is pre-set for a first imaging parameter to which the subject's biometric information is set, determines whether or not adjustment of a second imaging parameter different from the first imaging parameter is necessary, and when it is determined that adjustment of the second imaging parameter is necessary, displays parameter adjustment proposal information regarding adjustment of the second imaging parameter.

[0010] According to the imaging control device of the first aspect, parameter adjustment proposal information related to the adjustment of a second parameter that needs to be adjusted due to a change of a first imaging parameter from a first setting value to a second setting value is displayed. This simplifies the adjustment of the second imaging parameter linked to the change of the first imaging parameter, and reduces the influence on the captured image that depends on the operator's operation and the operator's proficiency. In other words, the effort required for input by the operator is reduced, and furthermore, the occurrence of forgetting to input the second imaging parameter, input errors, etc. is suppressed.

[0011] An imaging control device according to a second aspect is the imaging control device of the first aspect, wherein the processor may display, as the parameter adjustment proposal information, adjustment proposals for some of the second imaging parameters.

[0012] In the imaging control device of the third aspect, in the imaging control device of the second aspect, the processor may acquire selection information to select a displayed proposal for adjusting the second imaging parameter, and automatically adjust a third imaging parameter that is different from the selected second imaging parameter.

[0013] An imaging control device according to a fourth aspect is the imaging control device of the first aspect, wherein the processor may display information indicating an influence on imaging of the subject as the parameter adjustment proposal information.

[0014] An imaging control device according to a fifth aspect is the imaging control device of any one of the first to fourth aspects, wherein the processor may automatically acquire the second biological information value.

[0015] An imaging control device according to a sixth aspect is an imaging control device according to any one of the first to fifth aspects, wherein when multiple synchronized imaging tasks are performed, the processor acquires biometric information for each synchronized imaging task and sets the latest second setting value for each synchronized imaging task.

[0016] An imaging control device according to a seventh aspect is an imaging control device according to any one of the first to sixth aspects, wherein the processor calculates a second setting value based on biometric information acquired over a period of two or more cycles of the repetition period of the biometric information.

[0017] An imaging control device according to an eighth aspect is an imaging control device according to any one of the first to seventh aspects, wherein the processor acquires a change in a biometric information value, which is the value of biometric information, and when the change in the acquired biometric information value exceeds a specified value, reports abnormality information indicating an abnormality in the biometric information value.

[0018] In an imaging control device according to a ninth aspect, in an imaging control device according to any one of the first to eighth aspects, the processor may display a plurality of pieces of parameter adjustment suggestion information when it is determined that adjustment of the second imaging parameter is necessary.

[0019] In an imaging control device according to a 10th aspect, in an imaging control device according to any one of the 1st to 9th aspects, the processor may determine whether a second setting value based on the acquired biometric information of the subject has been changed from a pre-set first setting value for a first imaging parameter to which the biometric information of the subject is set.

[0020] In an 11th aspect of the imaging control device, in an imaging control device of any one of the 1st to 9th aspects, the processor may determine that adjustment of the second imaging parameter is necessary when the change in the second setting value of the first imaging parameter relative to the first setting value is greater than or equal to a specified value.

[0021] A medical imaging device according to a twelfth aspect of the present disclosure is a medical imaging device that performs imaging of a subject, including a synchronous imaging task in which the subject's biometric information is used, and is equipped with a processor and a memory that stores a program to be executed by the processor, wherein the processor acquires the subject's biometric information, and, when a second setting value based on the acquired biometric information of the subject has been changed from a first setting value that is preset for a first imaging parameter to which the subject's biometric information is set, determines whether or not adjustment of a second imaging parameter different from the first imaging parameter is necessary, and when it is determined that adjustment of the second imaging parameter is necessary, displays parameter adjustment proposal information regarding adjustment of the second imaging parameter.

[0022] The medical imaging device according to the twelfth aspect of the present disclosure can achieve the same effects as the imaging control device according to the first aspect. The components of the imaging control devices according to the second to eleventh aspects can be applied as the components of the medical imaging device according to the other aspects.

[0023] An imaging parameter setting method according to a thirteenth aspect of the present disclosure is an imaging parameter setting method in which a computer functioning as a medical imaging device that performs imaging of a subject, including a synchronous imaging task in which the subject's biometric information is used, acquires the subject's biometric information, and, when a second setting value based on the acquired biometric information of the subject has been changed from a first setting value that is preset for a first imaging parameter to which the subject's biometric information is set, determines whether or not adjustment of a second imaging parameter different from the first imaging parameter is necessary, and, when it is determined that adjustment of the second imaging parameter is necessary, displays parameter adjustment proposal information regarding adjustment of the second imaging parameter.

[0024] According to the imaging parameter setting method according to the thirteenth aspect of the present disclosure, it is possible to obtain the same effects as those of the imaging control device according to the first aspect. The constituent elements of the imaging control device according to the second to eleventh aspects can be applied as constituent elements of the imaging parameter setting method according to the other aspects.

[0025] A program according to a fourteenth aspect of the present disclosure is a program that enables a computer that functions as a medical imaging device that performs imaging of a subject, including a synchronous imaging task in which the subject's biometric information is used, to achieve the following functions: acquiring the subject's biometric information; determining whether or not a second imaging parameter different from the first imaging parameter is required to be adjusted when a second setting value based on the acquired biometric information of the subject has been changed from a first setting value that is preset for the first imaging parameter to which the subject's biometric information is set; and displaying parameter adjustment proposal information regarding the adjustment of the second imaging parameter when it is determined that adjustment of the second imaging parameter is required.

[0026] The program according to the 14th aspect of the present disclosure can provide the same operational effects as the imaging control device according to the 1st aspect. The components of the imaging control devices according to the 2nd to 11th aspects can be applied as the components of the program according to the other aspects. [Effects of the Invention]

[0027] According to the present disclosure, parameter adjustment proposal information is displayed regarding adjustment of a second parameter that needs to be adjusted due to a change in the setting value of a first imaging parameter from a first setting value to a second setting value, thereby realizing adjustment of the second imaging parameter in accordance with the change in the setting value of the first imaging parameter. [Brief explanation of the drawings]

[0028] [Figure 1] FIG. 1 is a perspective view showing the appearance of an MRI apparatus. [Figure 2] FIG. 2 is a schematic diagram showing the internal configuration of the MRI apparatus. [Figure 3]FIG. 3 is a flowchart showing the procedure of the medical image capturing parameter setting method according to the embodiment. [Figure 4] FIG. 4 is a schematic diagram showing an example of the configuration of a display screen. [Figure 5] FIG. 5 is a schematic diagram showing a display example of the imaging parameter setting area shown in FIG. [Figure 6] FIG. 6 is a schematic diagram showing a first example of a parameter adjustment proposal information display screen. [Figure 7] FIG. 7 is a schematic diagram showing a second example of the parameter adjustment proposal information display screen. [Figure 8] FIG. 8 is a schematic diagram showing a third example of the parameter adjustment proposal information display screen. [Figure 9] FIG. 9 is a timing chart showing an example of imaging parameters in ECG gated imaging. [Figure 10] FIG. 10 is a timing chart showing a case where the Beat Rata is changed. [Figure 11] FIG. 11 is a schematic diagram showing a first modification example of the imaging parameters. [Figure 12] FIG. 12 is a schematic diagram showing a second modification example of the imaging parameters. [Figure 13] FIG. 13 is a schematic diagram showing another display example of the imaging parameter setting area. [Figure 14] FIG. 14 is a schematic diagram of heartbeat detection when calculating the heart rate. [Figure 15] FIG. 15 is a flowchart showing the procedure for detecting abnormality in biological information. [Figure 16] FIG. 16 is a schematic diagram showing an example of notification of abnormality in biological information. DETAILED DESCRIPTION OF THE INVENTION

[0029] Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. In the following description and accompanying drawings, identical components are designated by the same reference numerals, and duplicate explanations will be omitted. In addition, when multiple components are listed in the following embodiments, it can be interpreted that at least one of the multiple components is included.

[0030] [Example of MRI system configuration] FIG. 1 is a perspective view showing the exterior of an MRI apparatus. The MRI apparatus 100, which is a magnetic resonance imaging apparatus, includes a gantry 110, which is the apparatus main body, and a bed 130. The bed 130 includes a top plate 130A and is disposed on the front side of a bore 120, which is a cylindrical imaging space provided in the gantry 110. The top plate 130A can be advanced into and withdrawn from the bore 120 using a top plate driving mechanism provided in the bed 130. The top plate driving mechanism is not shown in the drawing.

[0031] The bed 130 may be configured to be fixed to the gantry 110, or may be a dockable bed that is a movable bed that can be attached to and detached from the gantry 110. The MRI apparatus 100 is an example of a medical imaging apparatus of the present disclosure.

[0032] 2 is a schematic diagram showing the internal configuration of an MRI apparatus 100. The MRI apparatus 100 includes a static magnetic field generating magnet 104, a gradient magnetic field coil 106, and an RF transmission coil 108. Note that RF is an abbreviation for Radio Frequency.

[0033] The MRI apparatus 100 includes a high-frequency magnetic field generator 112, a receiver 114, a gradient magnetic field power supply 116, and a sequencer 118. The MRI apparatus 100 also includes an operation unit 140, a display unit 142, a control unit 150, a biological information detection device 152, and a biological information value calculation unit 154.

[0034] The subject Exa is placed on the top board 130A of the bed 130 and is placed in the imaging space. That is, the top board 130A on which the subject Exa is placed is moved to the bore 120. As a result, the examination region of the subject Exa is placed at the center of the static magnetic field in the bore 120.

[0035] The static magnetic field generating magnet 104 generates a uniform static magnetic field in the imaging space. The static magnetic field generating magnet 104 includes a permanent magnet type, normal conducting type, or superconducting type static magnetic field generating source. The gradient magnetic field coil 106 generates a gradient magnetic field in the imaging space. The gradient magnetic field coil 106 is composed of gradient magnetic field coils in the three axes of X, Y, and Z, which are real space coordinate systems and stationary coordinate systems. Each gradient magnetic field coil is connected to a gradient magnetic field power supply 116 and is supplied with current. As a result, gradient magnetic fields are generated in the three axes of X, Y, and Z.

[0036] The RF transmission coil 108 is a coil that irradiates a radio frequency magnetic field pulse to the subject Exa. The radio frequency magnetic field pulse may also be referred to as an RF pulse. The RF transmission coil 108 is connected to a radio frequency magnetic field generator 112, and a radio frequency pulse current is supplied to the RF transmission coil 108. The radio frequency magnetic field generator 112 is driven in accordance with instructions from a sequencer 118 to amplitude-modulate the radio frequency pulse and supply the amplified radio frequency pulse to the RF transmission coil 108.

[0037] The sequencer 118 sends commands to the radio frequency magnetic field generator 112 and the gradient magnetic field power supply 116 according to the imaging pulse sequence, causing them to generate a radio frequency magnetic field and a gradient magnetic field, respectively. The generated radio frequency magnetic field is applied to the subject Exa as a pulsed radio frequency magnetic field via the RF transmission coil 108. This induces a nuclear magnetic resonance phenomenon in the spins of atoms that make up the biological tissue of the subject Exa. Note that nuclear magnetic resonance may be referred to as NMR, an abbreviation of nuclear magnetic resonance.

[0038] The MRI apparatus 100 includes a receiving coil unit. The receiving coil unit is a coil that receives echo signals emitted due to the NMR phenomenon of the spins of atoms that constitute the biological tissue of the subject Exa. The echo signals may also be referred to as NMR signals.

[0039] In Figure 2, the receiving coil unit is not shown. The receiving coil unit may be a blanket type that is applied to imaging of the chest, abdomen, etc. Different receiving coil units may be applied depending on the examination area. For example, receiving coil units for imaging various areas such as the head, spine, abdomen, legs, and arms can be used. One or more receiving coil units may be used in one imaging session. Multiple receiving coil units for imaging different areas may be used together. Note that the receiving coil unit may sometimes be simply called a receiving coil. The NMR signal generated from the subject Exa is received using the receiving coil unit and detected using the receiver 114.

[0040] The nuclear magnetic resonance frequency used as a detection reference in the receiver 114 is set by the sequencer 118. The nuclear magnetic resonance frequency may be referred to as a detection reference frequency. The sequencer 118 controls each component so that pre-programmed timing and intensity are applied. A program that describes, in particular, the timing and intensity of RF pulses, gradient magnetic fields, and signal reception is called a pulse sequence. Various pulse sequences are known depending on the purpose.

[0041] The operation unit 140 includes a mouse, a keyboard, etc., and functions as part of a GUI that accepts input from an operator using a display operation window displayed on the display unit 142. That is, the operation unit 140 and the display unit 142 function as a GUI that allows the operator to start, stop, or pause the MRI apparatus 100, select a pulse sequence, and input imaging conditions and processing conditions, etc. Note that GUI is an abbreviation for Graphical User Interface.

[0042] The control unit 150 controls the operation of the MRI apparatus 100 via the sequencer 118, receives signals detected by the receiver 114, and performs various signal processing such as image reconstruction.

[0043] The receiver 114 applies a set detection reference frequency, performs quadrature phase detection on the echo signal, which is an analog wave, converts it into raw data, and then transmits it to the control unit 150. This raw data is also called an echo signal or measurement data.

[0044] The control unit 150 acquires biological information of the subject Exa, and sets biological information values ​​calculated from the acquired biological information as imaging parameters. The control unit 150 executes a synchronous imaging task synchronized with the biological signal, triggered by the biological signal representing the acquired biological information.

[0045] The biological information detection device 152 includes a sensor that detects biological information of the subject Exa. The biological information detection device 152 may be an electrocardiograph that detects electrocardiographic information of the subject Exa. The biological information detection device 152 may be a respiratory function measurement device that detects respiratory information of the subject Exa. The biological information detection device 152 may be an external device separate from the MRI apparatus 100.

[0046] The bioinformation value calculation unit 154 calculates a bioinformation value from a biosignal output from the bioinformation detection device 152. Examples of the bioinformation value include a heart rate and a respiratory rate. The control unit 150 acquires the bioinformation value and sets the bioinformation value as an imaging parameter.

[0047] The control unit 150 receives various instruction inputs from the operation unit 140, controls each unit of the MRI apparatus 100, and performs processes such as converting the echo signals in the spatial frequency domain received via the sequencer 118 into images in real space by inverse Fourier transform, thereby generating an MRI image.

[0048] The control unit 150 can be configured using a computer. The computer applied to the control unit 150 may be a personal computer or a workstation. That is, the control unit 150 includes a processor and a memory, and the processor executes a program including instructions stored in the memory to realize various functions of the MRI apparatus 100.

[0049] The device including the control unit 150 and the biometric information value calculation unit 154 is an example of an imaging control device that sets imaging parameters to be applied to imaging in a medical image imaging device. The imaging control device may include a biometric information detection device 152.

[0050] [Procedure of medical image capturing parameter setting method according to the embodiment] In the medical image imaging parameter setting method according to the embodiment, in an examination including one or more ECG-gated imaging tasks, the heart rate of a subject Exa or the like is automatically set as a second setting value for the Beat Rate, which is one of the imaging parameters. Note that the second setting value of the Beat Rate may be set manually by an operator.

[0051] If the Beat Rate is significantly changed from the first setting value, which is a preset default value, it is determined that there are imaging parameters that need to be changed due to the change in Beat Rate, and options for adjusting the imaging parameters that need to be changed due to the change in Beat Rate are notified.

[0052] 3 is a flowchart showing the steps of a medical image pickup parameter setting method according to an embodiment. In step S1, the control unit 150 shown in FIG. 2 loads an examination protocol onto the examination screen displayed on the display unit 142. That is, information about the examination protocol is displayed on the examination screen.

[0053] When the examination protocol is loaded, first setting values ​​of the imaging parameters are set for each imaging task. The default values ​​of the imaging parameters may be referred to as initial values. The step of setting the default values ​​of the imaging parameters may be executed separately from step S1.

[0054] In step S2, when the operator selects an arbitrary synchronized imaging task from among the synchronized imaging tasks displayed on the examination screen, the control unit 150 acquires selection information of the synchronized imaging task.

[0055] In step S3, the control unit 150 acquires the biometric information value generated using the biometric information value calculation unit 154. The control unit 150 sets the acquired biometric information value as a second setting value for the Beat Rate.

[0056] That is, in step S3, a second setting value is set for the Beat Rate at the timing when one of one or more synchronized imaging tasks displayed on the examination screen is selected. The timing when a synchronized imaging task is selected here may include the timing when an arbitrary synchronized imaging task reaches the order of execution when multiple synchronized imaging tasks are executed in sequence. Note that the "Scan parameter" in step 3 shown in Fig. 3 represents an imaging parameter. Also, "acquiring a biometric information value" in step S3 is synonymous with "acquiring a second setting value that is a biometric information value" and "accepting a second setting value that is a biometric information value," etc.

[0057] In step S4, the control unit 150 determines whether the second setting value set for the Beat Rate in step S3 has been changed from the preset first setting value.

[0058] In step S4, if the control unit 150 determines that the second setting value has not been changed with respect to the first setting value, the result is a No determination. If the result is a No determination, the process proceeds to step S9. On the other hand, if the control unit 150 determines that the second setting value has been changed with respect to the first setting value in step S4, the result is a Yes determination. If the result is a Yes determination, the process proceeds to step S5.

[0059] In step S5, the control unit 150 determines whether or not adjustment of imaging parameters other than the Beat Rate is necessary due to the change in the Beat Rate. If the control unit 150 determines in step S5 that adjustment of imaging parameters other than the Beat Rate is not necessary, the determination is No. If the determination is No, the process proceeds to step S9.

[0060] On the other hand, if the control unit 150 determines in step S5 that an imaging parameter other than the Beat Rate needs to be adjusted, the determination is Yes. If the determination is Yes, the process proceeds to step S6.

[0061] In step S6, the control unit 150 displays options for the imaging parameters that require adjustment on the display unit 142. Note that "Suggestion" in step S6 represents a proposal of options.

[0062] The control unit 150 calculates and stores the adjustment values ​​of the imaging parameters proposed to be adjusted in step S6 and the adjustment values ​​of the imaging parameters different from the Beat Rate. Furthermore, the control unit 150 calculates and stores the adjustment values ​​of the imaging parameters for which adjustment is not proposed, among the imaging parameters that need to be adjusted due to a change in the Beat Rate.

[0063] Note that Beat Rata is an example of a first imaging parameter of the present disclosure. The imaging parameter for which adjustment is proposed is an example of a second imaging parameter of the present disclosure. Of the imaging parameters that require adjustment due to a change in Beat Rate, the imaging parameter for which adjustment is not proposed is an example of a third imaging parameter different from the second imaging parameter of the present disclosure.

[0064] In step S7, when any of the options relating to the adjustment of the imaging parameters displayed on the display unit 142 is selected, the control unit 150 acquires selection information relating to the adjustment of the imaging parameters.

[0065] In step S8, the control unit 150 adjusts all imaging parameters that require adjustment due to the change in the Beat Rate, based on the selection information acquired in step S7. That is, imaging parameters proposed for adjustment and imaging parameters different from the imaging parameters proposed for adjustment are automatically adjusted.

[0066] In step S9, the control unit 150 accepts an operation to start imaging. In step S9, when the control unit 150 accepts an operation to start imaging, the control unit 150 executes the selected imaging task.

[0067] In step S10, the control unit 150 determines whether the final imaging task has been executed each time an imaging task is completed. If the control unit 150 determines in step S10 that the final imaging task has not been executed, the determination is No. If the determination is No, the process proceeds to step S2, and steps S2 to S10 are repeatedly executed until the determination is Yes in step S10.

[0068] On the other hand, if the control unit 150 determines in step S10 that the final imaging task has been executed, the determination is Yes. If the determination is Yes, a specified termination process is executed, and the procedure of the medical image imaging parameter setting method is terminated.

[0069] In the medical image imaging parameter setting method according to the embodiment, steps S4 and S5 may be performed as one process. That is, a range of the beat rate within which an imaging parameter that needs to be adjusted due to a change in the beat rate occurs may be defined in advance, and a step of determining whether the change in the beat rate exceeds the defined range may be performed. In step S6, if the change in the beat rate exceeds the defined range, options for the imaging parameter that needs to be adjusted may be displayed on the display unit 142.

[0070] When a change in the biometric information value occurs during the execution of any imaging task, a change in the Beat Rata may be implemented for an imaging task to be executed next to the imaging task currently being executed, and an adjustment value of an imaging parameter different from the Beat Rata may be calculated. During the execution of the imaging task in which a change in the biometric information value occurs, an adjustment value of an imaging parameter different from the Beat Rata may be calculated.

[0071] [Example of display screen configuration] Fig. 4 is a schematic diagram showing an example of the configuration of a display screen. The display screen 200 shown in Fig. 4 is displayed on the display unit 142 shown in Fig. 2. The display unit 142 may be a display provided in the gantry 110.

[0072] The display screen 200 displays a protocol display area 202, a positioning image display area 204, an imaging parameter setting area 206, an imaging start button 208, etc. The display screen 200 has the protocol display area 202 located at the left end in Fig. 4, the positioning image display area 204 located in the center, and the imaging parameter setting area 206 and the imaging start button 208 located at the right end.

[0073] Information about the examination protocol used for imaging the subject Exa is displayed in the protocol display area 202. The protocol display area 202 includes a protocol identification information display area 210, a task selection information display area 212, and a task information display area 214.

[0074] The protocol identification information display area 210 displays identification information of the examination protocol, such as the name of the loaded examination protocol. The task selection information display area 212 displays identification information of the imaging task, such as the name of the imaging task selected from one or more imaging tasks included in the loaded examination protocol. The task selection information display area 212 may be highlighted.

[0075] The task information display area 214 displays identification information of the imaging tasks, such as the names of one or more imaging tasks included in the loaded examination protocol. Figure 4 shows an example in which multiple imaging tasks included in the examination protocol are arranged from top to bottom in the order in which they will be executed.

[0076] The positioning image display area 204 displays the positioning image acquired by performing positioning imaging. Fig. 4 illustrates the positioning image display area 204 in which four positioning images are displayed. Each area included in the positioning image display area 204 may display an image to which a different cross section is applied.

[0077] Imaging parameters to be applied to imaging of the subject Exa are displayed in the imaging parameter setting area 206. The imaging parameter setting area 206 may be displayed in a pop-up format.

[0078] The imaging start button 208 is a software button that the operator clicks or otherwise operates when imaging is to be started. The control unit 150 shown in Fig. 2 accepts the operation of the imaging start button 208 and executes the selected imaging task.

[0079] [Example of imaging parameter setting area] Fig. 5 is a schematic diagram showing a display example of the imaging parameter setting area shown in Fig. 4. Fig. 5 shows an imaging parameter display screen 220 that is displayed when the operator clicks on the imaging parameter setting area 206.

[0080] For example, a pull-down selection screen is displayed when the operator clicks on the imaging parameter setting area 206. An imaging parameter display screen 220 is displayed for the imaging parameters selected on the selection screen.

[0081] The imaging parameter display screen 220 shown in FIG. 5 includes an identification information display area 222 in which identification information such as the names of each of a plurality of imaging parameters is displayed, and a setting display area 224 in which settings for each imaging parameter are displayed.

[0082] Arrow tabs 226 that are clicked to display a pull-down menu are displayed in each section of the setting display area 224 shown in Fig. 5. In the setting display area 224 for imaging parameters in which numerical values ​​are set, an upward arrow tab 226A for increasing the numerical value and a downward arrow tab 226B for decreasing the numerical value are displayed.

[0083] A first setting value is set as a default value for each imaging parameter. The first setting value for each imaging parameter may be a first setting value obtained by adjusting a fixed value held by the MRI apparatus 100 according to the state of the subject Exa, etc. For example, when the fixed value of the heart rate for the Beat Rate is 60 beats per minute, if the measured value of the heart rate of the subject Exa is 65 beats per minute, the first setting value for the Beat Rate may be set to 65 beats per minute.

[0084] The delay is set to a delay period from the trigger timing to the timing when the main scan starts. For example, 600.0 milliseconds may be set as the first setting value for the delay, which corresponds to a beat rate of 60 beats per minute.

[0085] FIG. 5 shows a case where the Beat Rate is changed from the first set value to the second set value of 90 beats per minute, and the Delay is adjusted from the first set value to the second set value of 350.0 milliseconds due to the change in Beat Rate.

[0086] 5 illustrates, as imaging parameters, Gating, Beat Rate, Gating Source, Gate Mode, Count, Multi Phase, Segment, Delay, and Interval. Related imaging parameters may be set in a linked manner. For example, when Gating is set to Cine, which represents electrocardiogram-gated imaging, Gating Source may be automatically set to ECG, which represents an electrocardiograph.

[0087] [Examples of parameter adjustment proposal information] [Example 1] Fig. 6 is a schematic diagram showing a first example of a parameter adjustment proposal information display screen. The parameter adjustment proposal information display screen 240 shown in Fig. 6 is displayed when the Beat Rate is changed on the imaging parameter display screen 220 shown in Fig. 5 and there are imaging parameters that need to be adjusted due to the change in the Beat Rate.

[0088] 6 includes a suggestion information display area 242, an OK button 244, a cancel button 246, and text information 248. The suggestion information display area 242 displays a plurality of suggestions regarding the adjustment of imaging parameters.

[0089] FIG. 6 illustrates an example in which, as parameter proposal information regarding adjustment of imaging parameters, a proposal to adjust the delay to 350 milliseconds and a proposal to keep the original setting without changing the delay are displayed.

[0090] The OK button 244 is a button that the operator operates when deciding on a selection. The cancel button 246 is a button that the operator operates when canceling a selection. Figure 6 shows an example of text information 248 that urges the operator to make a selection.

[0091] 6 shows a state in which the proposal to adjust the delay to 350 milliseconds has been selected. When the operator operates the OK button 244, the selection of the proposal to adjust the delay to 350 milliseconds is confirmed. On the other hand, when the operator operates the Cancel button 246, it becomes possible to select another option.

[0092] Once the adjustment of the imaging parameters to adjust the Delay to 350 milliseconds is confirmed, the control unit 150 shown in FIG. 2 changes the setting values ​​of other imaging parameters that require adjustment due to the adjustment of the Delay to 350 milliseconds to the calculated adjustment values.

[0093] [Example 2] 7 is a schematic diagram showing a second example of a parameter adjustment proposal information display screen. The parameter adjustment proposal information display screen 260 shown in the figure includes a proposal information display area 262, an OK button 264, a cancel button 266, and text information 268. The OK button 264, the cancel button 266, and the text information 268 each have the same functions as the OK button 244, etc. shown in FIG. 6. Here, a description of the OK button 264, etc. will be omitted.

[0094] The suggested information display area 242 shown in FIG. 6 shows two options, whereas the suggested information display area 262 shown in FIG. 7 shows only one option, which suggests adjusting the Delay to 350 milliseconds.

[0095] When selecting the imaging parameter adjustment to adjust the delay to 350 milliseconds, the operator confirms the selection of the imaging parameter adjustment to adjust the delay to 350 milliseconds by operating the OK button 264. On the other hand, when the operator does not want to change the delay and keeps the original setting, the operator confirms the keeping of the original setting by operating the Cancel button 266.

[0096] [Example 3] 8 is a schematic diagram showing a third example of a parameter adjustment proposal information display screen. The parameter adjustment proposal information display screen 280 shown in the figure includes a proposal information display area 282, an OK button 284, a cancel button 286, and text information 288. The OK button 284, the cancel button 286, and the text information 288 each have the same functions as the OK button 244, etc. shown in FIG. 6. Here, a description of the OK button 284, etc. will be omitted.

[0097] The proposed information display area 242 shown in Fig. 6 specifically proposes imaging parameters and adjustment values ​​to be adjusted, whereas the proposed information display area 282 shown in Fig. 8 displays options indicating the impact on imaging. The proposed information display area 282 displays the options, including a proposal to reduce the number of slices, a proposal to maintain the imaging period, a proposal to image the entire region, and a proposal to maintain the original imaging parameters. The proposal to maintain the imaging period represents the impact on imaging, that is, a decrease in spatial resolution. The proposal to image the entire region represents the impact on imaging, that is, an extension of the imaging period.

[0098] 8 shows a state in which the proposal to reduce the number of slices has been selected. When the operator operates the OK button 284, the selection of the proposal to reduce the number of slices is confirmed. On the other hand, when the operator operates the Cancel button 286, other options become available for selection.

[0099] Once the adjustment of the imaging parameters to reduce the number of slices is confirmed, the control unit 150 shown in Figure 2 changes the setting values ​​of other imaging parameters that require adjustment due to the adjustment to reduce the number of slices to the calculated adjustment values.

[0100] [Example of adjusting imaging parameters] FIG. 9 is a timing chart showing an example of imaging parameters for ECG-gated imaging. The timing chart shows a case where the beat rate is set to 60 beats per minute. The symbol R indicates the R wave of the electrocardiogram waveform, which functions as a trigger for synchronized imaging. When the heart rate is 60 beats per minute, the period between any R wave and the next R wave is 1000 milliseconds.

[0101] FIG. 9 shows a timing chart for when Tgigger, which performs imaging after a certain period of time has elapsed since the trigger, is set as the Gate Mode. In the example shown in FIG. 9, Delay, which represents the time from the trigger to the main scan, is set to 600 milliseconds. Here, the main scan refers to the capture of medical images used for diagnosis. The dummy shown in FIG. 9 indicates preliminary imaging performed before the main scan.

[0102] The duration of the main scan is determined by the number of slices set as the segment. The delay and segment settings are calculated according to the beat rate setting so that the delay and main scan periods fit within the period between any R wave and the next R wave.

[0103] 10 is a timing chart showing a case where the Beat Rate is changed. When the Beat Rate is changed from 60 beats per minute to 80 beats per minute, the period between any R wave and the next R wave is changed from 1000 milliseconds to 750 milliseconds. For the example shown in FIG. 9, if the Delay and Segment settings are maintained, the period required for one sequence will exceed the period between any R wave and the next R wave by 250 milliseconds.

[0104] In such a case, the control unit 150 shown in FIG. 2 determines in step S5 shown in FIG. 5 that adjustment of imaging parameters other than the Beat Rate is necessary, and in step S6, causes the display unit 142 to display options for the imaging parameters that require adjustment.

[0105] 11 is a schematic diagram showing a first example of changing the imaging parameters, in which the Delay is adjusted from 600 milliseconds to 350 milliseconds as an imaging parameter that needs to be adjusted.

[0106] 2 derives a proposal to change the imaging parameters to reduce the delay by 250 milliseconds and prevent the period required for one sequence from exceeding the period between any R wave and the next R wave. Also, the control unit 150 derives a proposal to maintain the original imaging parameters.

[0107] The control unit 150 displays, as one option, a proposal to adjust the Delay setting value from 600 milliseconds to 350 milliseconds in the proposal information display area 242 on the parameter adjustment proposal information display screen 240 shown in Fig. 6. The control unit 150 also displays, as one option, a proposal to maintain the original imaging parameters in the proposal information display area 242.

[0108] 12 is a schematic diagram showing a second example of changing the imaging parameters, which illustrates an example of reducing the number of slices, which is a setting value of Segment, as an imaging parameter that needs to be adjusted.

[0109] 2 derives a proposal to change the imaging parameters to prevent the period required for one sequence from exceeding the period between any R wave and the next R wave by reducing the number of slices, which is the setting value of Segment, by 250 milliseconds to 350 milliseconds, by reducing the imaging period during which the main scan is performed. The control unit 150 derives a proposal to maintain the original imaging parameters, and displays the proposal to maintain the original imaging parameters in the proposal information display area 242 as one option.

[0110] The control unit 150 displays the proposal to adjust the setting value of the Segment to reduce the number of slices as one option in the proposal information display area 242 on the parameter adjustment proposal information display screen 240 shown in FIG.

[0111] [Another example of the imaging parameter setting area] 13 is a schematic diagram showing another display example of the imaging parameter setting area. The imaging parameter setting screen 300 shown in the drawing is displayed in the imaging parameter setting area 206 shown in FIG.

[0112] A plurality of imaging parameters are grouped by the function of the imaging parameter on the imaging parameter setting screen 300. Fig. 13 shows an example in which group 1 includes six imaging parameters, parameter 11 to parameter 16, and group 2 includes nine imaging parameters, parameter 21 to parameter 29.

[0113] 13 illustrates two groups, but the number of groups may be three or more. The number of imaging parameters for each group is also not limited to the embodiment illustrated in the figure, and may be specified as appropriate. Furthermore, the arrangement of the groups and the arrangement of the imaging parameters for each group are also not limited to the example illustrated in FIG. 13, and may be specified as appropriate.

[0114] The imaging parameter setting screen 300 displays an identification information display section 302 for displaying identification information such as the name of the imaging parameter for each imaging parameter, and a setting display section 304 for displaying settings for each imaging parameter.

[0115] A pop-up display is applied to the setting display section 304. That is, the setting display section 304 includes a pop-up display tab 306 that the operator operates when displaying a pop-up. The setting display section 304 to which a numerical value is applied includes an increase tag 306A that displays a pop-up that increases the numerical value, and a decrease tag 306B that displays a pop-up that decreases the numerical value.

[0116] When an examination protocol for each subject Exa is loaded, a predetermined initial setting is set for each imaging parameter. The initial setting here may be an initial setting held by the MRI apparatus 100 itself, or an initial setting specified for the loaded examination protocol. The initial setting may be a type of processing or a numerical value.

[0117] The operator can visually check the initial settings of the imaging parameters by displaying the imaging parameter setting screen 300. The operator can also change the initial settings of the imaging parameters using the imaging parameter setting screen 300. Furthermore, the operator can change and adjust the imaging parameters for each task using the imaging parameter setting screen 300.

[0118] [Example of automatic acquisition of biometric information] FIG. 14 is a schematic diagram of heartbeat detection when calculating the heart rate. FIG. 14 shows a schematic diagram of an electrocardiogram waveform 400 generated from an electrocardiogram signal output from an electrocardiograph. In the electrocardiogram waveform 400 shown in FIG. 14, components other than R waves, such as P waves, are omitted from the illustration. The automatic acquisition of the heart rate will be exemplified below as an example of automatic acquisition of biological information. Note that the symbol T c represents one cardiac cycle. m represents the period during which the output signal of the electrocardiograph used to calculate the heart rate is acquired.

[0119] The biological information value calculation unit 154 shown in Fig. 2 calculates the heart rate based on the electrocardiogram signal acquired over a period of two or more cardiac cycles. Fig. 14 shows an example in which five cardiac cycles are used as the period for acquiring the electrocardiogram signal.

[0120] For example, if a sudden disturbance occurs in the heart rate of the subject Exa, an abnormal waveform R shown in FIG. 14 appears as an R wave. a When an electrocardiogram signal containing the above is acquired, the measured heart rate will increase sharply temporarily. A heart rate that increases sharply temporarily is not a desirable setting value for Beat Rata.

[0121] In the MRI apparatus 100, the heart rate to be applied to synchronized imaging is calculated based on the electrocardiogram signal acquired over a fixed period of two or more cycles of the electrocardiogram signal. This allows a temporary, sudden change in the biological information value when breathing disturbance due to coughing occurs to be excluded from the set value of the Beat Rate.

[0122] When the respiratory rate is used as a bioinformation value, the respiratory rate to be applied to synchronized imaging is calculated based on the respiratory signal acquired over a fixed period of two or more cycles, just as when the heart rate is used.

[0123] [Detection of abnormalities in biological information] Fig. 15 is a flowchart showing the procedure for detecting an abnormality in biological information. When an abnormality in the biological information is detected, the control unit 150 shown in Fig. 2 does not use the biological signal value calculated from the biological information as the set value of the Beat Rata, but notifies the user that an abnormality in the biological information has occurred.

[0124] 2 acquires an electrocardiogram signal representing the heartbeat of the subject Exa from the electrocardiograph functioning as the biological information detection device 152. The acquisition of the electrocardiogram signal is performed multiple times consecutively at a specified sampling period.

[0125] In step S22, the biological information value calculation unit 154 calculates the heart rate of the subject Exa from the electrocardiogram signal. The calculated heart rates may be stored in chronological order. Each time a heart rate is calculated, the latest heart rate may be stored, and past heart rates other than the latest heart rate may be deleted.

[0126] In step S23, the biological information value calculation section 154 calculates the change in the heart rate. The change in the heart rate is calculated using electrocardiogram signals acquired at two consecutive sampling times.

[0127] In step S24, the control unit 150 determines whether the change in the heart rate is equal to or greater than a specified value. The reference value applied to the determination of an abnormality in the heart rate may be a fixed value. The reference value applied to the determination of an abnormality in the heart rate may be specified according to the attributes of the subject Exa, etc.

[0128] In step S24, if the control unit 150 determines that the change in heart rate is less than the specified value, the result is No. If the result is No, the process proceeds to step S27. On the other hand, in step S24, if the control unit 150 determines that the change in heart rate is equal to or greater than the specified value, the result is Yes. If the result is Yes, the process proceeds to step S25.

[0129] In step S25, the control unit 150 stops taking in the heart rate. In step S26, the control unit 150 notifies the user of an abnormal heart rate. That is, in step S26, abnormality information indicating an abnormal heart rate is notified.

[0130] In step S27, the control unit 150 determines whether or not to end the abnormal heart rate detection. If the abnormal heart rate detection continues, the determination is No. If the determination is No, the process proceeds to step S21, and steps S21 to S27 are repeatedly executed until the determination is Yes in step S27.

[0131] On the other hand, if the heart rate abnormality detection is to be ended, the result is Yes. If the result is Yes, a specified end process is carried out and the heart rate abnormality detection is ended.

[0132] Fig. 16 is a schematic diagram showing an example of notification of an abnormality in biological information. One cause of the abnormality in the biological information is an abnormality in the attachment of the sensor that detects the biological information. Fig. 16 shows an example in which biological information abnormality detection information 500 is superimposed on the display screen 200 shown in Fig. 4.

[0133] The display manner of the abnormal biological information detection information 500 is not limited to the example shown in Fig. 16. For example, a dedicated screen for displaying the abnormal biological information detection information 500 may be displayed on the display unit 142 shown in Fig. 2.

[0134] The notification of abnormality in the biological information is not limited to the mode using text information as shown in Fig. 16. The notification of abnormality in the biological information may be visual information such as the lighting of a lamp to notify the abnormality. The notification of abnormality in the biological information may be auditory information such as voice or an alarm sound.

[0135] [Effects of the embodiment] The MRI apparatus 100 and the imaging parameter setting method according to the embodiment can achieve the following advantageous effects.

[0136] [1] In gated imaging in which biological information is applied, biological information values ​​such as heart rate and respiratory rate are automatically set as the second setting value of the Beat Rate, thereby preventing the occurrence of incorrect setting of the Beat Rate.

[0137] [2] When the setting value of the beat rate is changed, other imaging parameters that need to be adjusted are calculated. This simplifies the operator's operations regarding imaging parameters. Also, the influence on the captured image that depends on the operator's skill level is reduced.

[0138] [3] The direction of adjustment is proposed for imaging parameters other than the Beat Rate that require adjustment due to a change in the Beat Rate setting value, which simplifies adjustment of imaging parameters other than the Beat Rate for the operator when the Beat Rate setting value is changed.

[0139] [4] As a proposal regarding the direction of adjustment of the imaging parameters, the influence on the captured image obtained by performing the main scan, etc. is displayed, which allows the operator to adjust the imaging parameters taking into account the influence on the captured image.

[0140] [5] When the same examination protocol includes a plurality of synchronized imaging tasks, the beat rate is set based on the latest biological information at the selection timing for each synchronized imaging task.

[0141] [6] The biometric information value set as the Beat Rate is calculated over a certain period of time, which prevents the Beat Rate setting from being affected by sudden fluctuations in biometric information such as heart rate and breathing.

[0142] [7] When an abnormality in vital signs such as heart rate or respiration is detected, the Beat Rate is not set to a vital sign value and the abnormality is reported. This prevents the Beat Rate setting from being affected by an abnormality in the installation of the sensor that detects the vital signs.

[0143] The present disclosure is not limited to the above-described embodiments, and various modifications are possible within the scope of the gist of the technical idea of ​​the present disclosure. [Explanation of symbols]

[0144] 100 MRI machine 142 Display section 150 control section 152 Biometric information detection device 154 Biometric information value calculation unit

Claims

1. 1. An imaging control device that sets imaging parameters to be applied to a medical image imaging device that performs imaging of a subject, the imaging device including a synchronous imaging task using biological information of the subject, a processor; a memory for storing a program to be executed by the processor; Equipped with The processor: acquiring the biological information of the subject; determining whether or not adjustment of a second imaging parameter different from the first imaging parameter is necessary when a second setting value based on the acquired biological information of the subject is changed from a first setting value that is preset for the first imaging parameter to which biological information of the subject is set; when it is determined that adjustment of the second imaging parameter is necessary, displaying parameter adjustment proposal information regarding adjustment of the second imaging parameter; Imaging control device.

2. The processor: displaying, as the parameter adjustment proposal information, a proposal for adjustment of some of the second imaging parameters; The imaging control device according to claim 1 .

3. The processor: obtaining selection information for selecting the displayed proposal for adjusting the second imaging parameter; automatically adjusting a third imaging parameter different from the selected second imaging parameter; The imaging control device according to claim 2 .

4. the processor displays, as the parameter adjustment proposal information, information representing an influence on imaging of the subject. The imaging control device according to claim 1 .

5. The processor automatically acquires the second setting value. The imaging control device according to claim 1 .

6. When a plurality of the synchronized imaging tasks are performed, the processor acquires the biological information for each synchronized imaging task; setting the latest second setting value for each of the synchronized imaging tasks; The imaging control device according to claim 1 .

7. the processor calculates the second setting value based on the biological information acquired over two or more repetition periods of the biological information; The imaging control device according to claim 1 .

8. The processor: A change in a biometric information value, which is a value of the biometric information, is acquired; When the change in the acquired biological information value exceeds a specified value, abnormality information indicating an abnormality in the biological information value is notified. The imaging control device according to claim 1 .

9. the processor, when it is determined that adjustment of the second imaging parameter is necessary, displays a plurality of pieces of parameter adjustment proposal information; The imaging control device according to claim 1 .

10. the processor determines whether or not a second setting value based on the acquired biological information of the subject has been changed from a first setting value that is set in advance for a first imaging parameter to which biological information of the subject is set; The imaging control device according to claim 1 .

11. The processor determines that adjustment of the second imaging parameter is necessary when a change in the second setting value of the first imaging parameter relative to the first setting value is equal to or greater than a specified value. The imaging control device according to claim 1 .

12. 1. A medical imaging apparatus for performing imaging of a subject, the imaging task including a synchronized imaging task using biological information of the subject, a processor; a memory for storing a program to be executed by the processor; Equipped with The processor: acquiring the biological information of the subject; determining whether or not adjustment of a second imaging parameter different from the first imaging parameter is necessary when a second setting value based on the acquired biological information of the subject is changed from a first setting value that is preset for the first imaging parameter to which biological information of the subject is set; when it is determined that adjustment of the second imaging parameter is necessary, displaying parameter adjustment proposal information regarding adjustment of the second imaging parameter; Medical imaging equipment.

13. a computer that functions as a medical imaging apparatus that performs imaging of a subject, the imaging task including a synchronized imaging task using biological information of the subject, Acquire the subject's biological information; determining whether or not adjustment of a second imaging parameter different from the first imaging parameter is necessary when a second setting value based on the acquired biological information of the subject is changed from a first setting value that is preset for the first imaging parameter to which biological information of the subject is set; when it is determined that adjustment of the second imaging parameter is necessary, displaying parameter adjustment proposal information regarding adjustment of the second imaging parameter; Imaging parameter setting method.

14. a computer that functions as a medical imaging apparatus that performs imaging of a subject, the imaging task including a synchronized imaging task using biological information of the subject; A function to acquire the subject's biometric information; a function of determining whether or not adjustment of a second imaging parameter different from the first imaging parameter is necessary when a second setting value based on the acquired biological information of the subject is changed from a first setting value that is preset for the first imaging parameter to which biological information of the subject is set; and realizing a function of displaying parameter adjustment proposal information regarding adjustment of the second imaging parameter when it is determined that adjustment of the second imaging parameter is necessary; program.

Images