Motion correction method, device, MR imaging system and storage medium in MR imaging

Abstract

Disclosed in embodiments of the present invention are a motion correction method, apparatus, MR imaging system, and storage medium for MR imaging. The method comprises: obtaining a reference navigation image before acquiring MR data for a target region of interest; performing motion detection using pilot tone signals received by multiple coils during MR data acquisition for the target region of interest, and marking the MR data acquired when motion occurs as motion-damaged data when motion is detected; acquiring a post-motion navigation image when the pilot tone signal detects the end of the motion; registering the post-motion navigation image with the reference navigation image to obtain motion correction parameters corresponding to the motion; and performing motion correction on the MR data acquisition using the motion correction parameters. The technical solutions in the embodiments of the present invention can improve MR imaging quality.

Description

Technical Field

[0001] The present invention relates to the field of magnetic resonance (MR) imaging technology, and in particular to a motion correction method and device in MR imaging, an MR imaging system, and a computer-readable storage medium. Background Art

[0002] MR imaging is a technique that utilizes the phenomenon of magnetic resonance. The principle behind MR imaging is that atomic nuclei containing a single number of protons, such as hydrogen nuclei, are ubiquitous in the human body. These protons exhibit spin motion, acting like small magnets. These spin axes are irregular. When an external magnetic field is applied, these small magnets rearrange themselves along the field's lines of force, specifically in two directions: parallel to or antiparallel to the field's lines of force. The direction parallel to the field's lines of force is called the positive longitudinal axis, while the direction antiparallel to the field's lines of force is called the negative longitudinal axis. Nuclei possess only a longitudinal magnetization component, which has both direction and amplitude. Exciting nuclei in an external magnetic field with radio frequency (RF) pulses of a specific frequency causes their spin axes to deviate from the positive or negative longitudinal axis, generating resonance—the magnetic resonance phenomenon. After the spin axes of the excited nuclei deviate from the positive or negative longitudinal axis, the nuclei acquire a transverse magnetization component.

[0003] After the RF pulse ceases, the excited nuclei emit echo signals, gradually releasing the absorbed energy as electromagnetic waves. Their phase and energy levels return to their pre-excitation states. Further processing of these echo signals, including through spatial encoding, allows for image reconstruction. This recovery of excited nuclei to their pre-excitation state is called relaxation, and the time required to return to equilibrium is called relaxation time.

[0004] A gradient magnetic field is a magnetic field applied to the main magnetic field, resulting in slight differences in the magnetic field strength experienced by the target region of interest during imaging. According to Larmor's law of magnetic resonance, human tissue resonates at different magnetic field intensities. Spatial positioning in MR imaging is primarily accomplished using gradient magnetic fields. Applying a gradient magnetic field to a relatively uniform main magnetic field subjects hydrogen protons in different parts of the body to varying magnetic field intensities, resulting in different Larmor frequencies. Using different RF excitations selectively excites the corresponding protons. The continuously changing gradient magnetic field, combined with the correspondingly changing RF generator, achieves spatial positioning. Determining position based on changes in the gradient magnetic field eliminates the need for patient movement.

[0005] During MR imaging, patient motion can cause severe image artifacts. Therefore, many methods for detecting / correcting motion have been proposed, but most are limited to specific sequences or situations, and a universal motion correction solution has not yet been developed.

[0006] Therefore, those skilled in the art are still working on finding other motion correction solutions. Summary of the Invention

[0007] In view of this, embodiments of the present invention provide, on the one hand, a motion correction method in MR imaging, and, on the other hand, provide a motion correction device and a computer-readable storage medium in MR imaging, to improve MR imaging quality.

[0008] A motion correction method in MR imaging proposed in an embodiment of the present invention includes: obtaining a reference navigation image before acquiring MR data of a target area of interest; during the process of acquiring MR data of the target area of interest, performing motion detection using pilot tone signals received by multiple coils, and when motion is detected, marking the MR data acquired when the motion occurs as motion-damaged data; obtaining a post-motion navigation image when the end of the motion is detected using the pilot tone signal; aligning the post-motion navigation image with the reference navigation image to obtain motion correction parameters corresponding to the motion; and using the motion correction parameters to perform motion correction on the MR data acquisition.

[0009] In one embodiment, the motion correction of MR data acquisition using the motion correction parameters includes: adjusting the currently applied gradient magnetic field according to the motion correction parameters so that the target region of interest remains relatively stationary with respect to the scanning field of view; restarting MR data acquisition from the position marked as motion-corrupted data until the MR data acquisition is completed, or when the next motion is detected using the pilot tone signal, returning to execute the operation of marking the MR data acquired when the motion occurs as motion-corrupted data.

[0010] In one embodiment, the use of the motion correction parameters to perform motion correction on the MR data acquisition includes: restarting MR data acquisition from the position marked as motion-corrupted data until the end of MR data acquisition, or when the next motion is detected using the pilot tone signal, returning to execute the operation of marking the MR data acquired when the motion occurs as motion-corrupted data; at the end of MR data acquisition, for each MR data re-acquired after the occurrence of motion, using the running correction parameters corresponding to the motion to perform motion correction on the re-acquired MR data.

[0011] In one embodiment, the method further comprises: triggering an automatic voice command for reminding the patient to remain still when the motion is detected using the pilot tone signal.

[0012] In one embodiment, the method further includes: counting the number of detected movements, and when the count value reaches a set threshold, popping up a dialog box, an operation box, or a voice instruction to ask the user whether he wants to stop scanning due to frequent movements, and stopping the current MR data acquisition when the user responds with "yes"; and continuing the current MR data acquisition when the user responds with "no".

[0013] In one embodiment, the method further includes providing the user with three predefined movement amount options of large, medium and small, and determining the movement amount that triggers the operation of obtaining a post-movement navigation image based on the received user selection.

[0014] A motion correction device for MR imaging proposed in an embodiment of the present invention includes: a motion detection module, configured to perform motion detection using pilot tone signals received by multiple coils during MR data acquisition, and output a first signal when a motion is detected; and output a second signal when the motion is detected to be finished; and a control processing module, configured to control an MR data acquisition device to perform MR data acquisition on a target region of interest and obtain MR data acquired by the MR data acquisition device; and before controlling the MR data acquisition device to perform MR data acquisition, control the MR data acquisition device to acquire a reference navigation image and obtain the reference navigation image; upon receiving the first signal, marking the MR data acquired when the motion occurs as motion-damaged data; upon receiving the second signal, controlling the MR data acquisition device to acquire a post-motion navigation image and obtain the post-motion navigation parameters, registering the post-motion navigation image with the reference navigation image to obtain motion correction parameters corresponding to the motion; and using the motion correction parameters to perform motion correction on the MR data acquisition.

[0015] In one embodiment, the control and processing module includes: a control module, configured to control an MR data acquisition device to acquire MR data of a target region of interest, and before acquiring MR data, control the MR data acquisition device to acquire a reference navigation image; upon receiving the second signal, control the MR data acquisition device to acquire a post-motion navigation image; upon acquiring a motion correction parameter, control the gradient magnetic field applied by the current MR imaging to be adjusted according to the motion correction parameter so that the target region of interest remains relatively stationary with respect to the scanning field of view, and control the MR data acquisition device to restart MR data acquisition from a position marked as motion-damaged data; a processing module, configured to receive the reference navigation image and MR data acquired by the MR data acquisition device, and upon receiving the first signal, mark the MR data acquired when the motion occurs as motion-damaged data; upon acquiring a post-motion navigation image acquired by the MR data acquisition device, align the post-motion navigation image with the reference navigation image to obtain motion correction parameters corresponding to the motion, and provide the motion correction parameters to the control module.

[0016] In one embodiment, the control and processing module includes: a control module for controlling an MR data acquisition device to acquire MR data of a target area of interest, and before acquiring MR data, controlling the MR data acquisition device to acquire a reference navigation image; upon receiving the second signal, controlling the MR data acquisition device to acquire a post-motion navigation image, and then controlling the MR data acquisition device to restart MR data acquisition from a position marked as motion-damaged data; and a processing module for receiving the reference navigation image and MR data acquired by the MR data acquisition device, and upon receiving the first signal, marking the MR data acquired when the motion occurs as motion-damaged data; upon acquiring the post-motion navigation image acquired by the MR data acquisition device, aligning the post-motion navigation image with the reference navigation image to obtain motion correction parameters corresponding to the motion; when the MR data acquisition device ends MR data acquisition, for each MR data acquired after the motion occurs, using the correction parameters corresponding to the motion to perform motion correction on the re-acquired MR data.

[0017] In one embodiment, the method further comprises: a first reminder module, configured to trigger an automatic voice command for reminding the patient to remain still upon receiving the first signal.

[0018] In one embodiment, it further includes: a second reminder module, which is used to count the number of detected movements based on the received first signal, and when the count value reaches a set threshold, pop up a dialog box or operation box or voice instruction to ask the user whether he wants to stop scanning due to frequent movements, and when receiving the user's reply indicating "yes", send a third signal to the control processing module; the control processing module controls the MR data acquisition device to stop MR data acquisition based on the third signal.

[0019] In one embodiment, it further includes: a configuration module for providing the user with three predefined exercise amount options of large, medium and small, and configuring the exercise amount for triggering the operation of sending the first signal for the motion detection module based on the received user selection.

[0020] A motion correction device in MR imaging proposed in an embodiment of the present invention includes: at least one memory and at least one processor, wherein: the at least one memory is used to store a computer program; the at least one processor is used to call the computer program stored in the at least one memory to execute the motion correction method in MR imaging as described in any of the above embodiments.

[0021] The computer-readable storage medium proposed in the embodiment of the present invention stores a computer program thereon; the computer program can be executed by a processor and implement the motion correction method in MR imaging as described in any of the above embodiments.

[0022] As can be seen from the above scheme, since the embodiment of the present invention utilizes a pilot tone signal for motion detection and marks the MR data acquired when motion occurs as motion-corrupted data, a reference navigation image is acquired before acquiring MR data, and a post-motion navigation image is acquired when motion stops. The post-motion navigation image is configured with the reference navigation image to obtain motion correction parameters corresponding to the motion, and the gradient magnetic field is then adjusted using the motion correction parameters to complete prospective motion correction. MR data acquisition is then restarted from the position marked as motion-corrupted data; alternatively, MR data acquisition is directly restarted from the position marked as motion-corrupted data, and finally, the re-acquired data is retrospectively motion corrected using the motion correction parameters. The current MR image is then obtained based on the MR signal data after motion correction and the MR data before the motion-corrupted data, thereby enabling accurate correction of the acquired image and improving MR imaging quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, so that those skilled in the art will understand the above and other features and advantages of the present invention more clearly. In the accompanying drawings:

[0024] Figure 1 This is an exemplary flow chart of a motion correction method in MR imaging according to an embodiment of the present invention.

[0025] Figure 2 The figure is a schematic diagram of collecting navigation images under the guidance of a pilot tone signal in an example of the present invention.

[0026] Figure 3 FIG. 1 is a schematic diagram of using a pilot tone signal for motion detection in an example of the present invention.

[0027] Figure 4 FIG. 4 is an exemplary structural diagram of a motion correction device in MR imaging according to an embodiment of the present invention.

[0028] Figure 5 This is an exemplary structural diagram of another motion correction device in MR imaging in an embodiment of the present application.

[0029] The accompanying drawings are numerals as follows:

[0030]

[0031] DETAILED DESCRIPTION

[0032] In an embodiment of the present invention, to ensure that motion correction is not restricted by a specific imaging sequence, a highly motion-sensitive pilot tone signal is considered for detecting patient movement. When motion is detected, the patient is reminded to remain still. Furthermore, navigation images can be combined to obtain accurate motion information, such as for calculating motion correction parameters and triggering prospective or retrospective motion correction.

[0033] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is further described in detail with reference to the following examples.

[0034] Figure 1 This is an exemplary flow chart of a motion correction method in MR imaging according to an embodiment of the present invention. Figure 2 FIG. 1 is a schematic diagram of collecting a navigation image (NI, NavigatorImage) under the guidance of a pilot tone (PT, Pilot Tone) signal in an example of the present invention. Figure 1 and Figure 2 As shown, the method may include the following operations:

[0035] Step S11 : before acquiring MR data of the target region of interest, obtaining a reference navigation image.

[0036] Among them, the navigation image is a low-resolution image. Figure 2 As shown, a reference navigation image 21 is acquired before MR data acquisition.

[0037] Step S12 , during the MR data acquisition process, motion detection is performed using pilot tone signals received by multiple coils. When a motion is detected, the MR data acquired when the motion occurs is marked as motion-corrupted data.

[0038] In this embodiment, there are many ways to implement motion detection using pilot tone signals. For example, Figure 3 FIG. 1 is a schematic diagram showing an example of motion detection using a pilot tone signal.

[0039] like Figure 3 As shown, in an MR imaging system, a transmitting antenna 311 can be installed in a local coil 31 to transmit a radio frequency signal with a frequency slightly lower or higher than the MR center frequency. This radio frequency signal is then modulated by respiration / heartbeat or body movement, and the modulated signal is received by the MR receiving coil. After A / D conversion 32 and preprocessing (MR signal filtering) 33, a digitized motion-modulated pilot tone signal S(t) is generated.

[0040] like Figure 2 As shown, when the first motion M1 is detected in sequence using the pilot tone signal, the corresponding acquisition position of the MR data is marked as damaged, as shown in FIG. Figure 2 The small triangle mark S1 shown in FIG, marks the MR data collected when the motion occurs as motion-damaged data. Similarly, when the second motion M2 is detected in sequence using the pilot tone signal, the corresponding acquisition position of the MR data is also marked as damaged, as shown in FIG. Figure 2 The small triangle shown in FIG. 1 is marked S2.

[0041] Step S13: When the end of the movement is detected by using the pilot tone signal, a post-movement navigation image is acquired.

[0042] like Figure 2 As shown, when the first movement M1 is detected to have stopped, a first post-movement navigation image 22 is acquired. Similarly, when the second movement M2 is detected to have stopped, a second post-movement navigation image 23 is acquired.

[0043] Step S14: registering the post-movement navigation image with the reference navigation image to obtain motion correction parameters corresponding to the movement.

[0044] In a specific implementation, when the post-movement navigation image is registered with the reference navigation image, a geometric transformation matrix can be obtained. The motion transformation matrix is the motion correction parameter corresponding to the motion.

[0045] like Figure 2As shown, when the first post-motion navigation image 22 is registered with the reference navigation image 21, the geometric transformation matrix obtained is Similarly, when the second post-motion navigation image 23 is registered with the reference navigation image 21, the geometric transformation matrix obtained is

[0046] Step S15: performing motion correction on the MR data acquisition using the motion correction parameters.

[0047] There are many ways to implement this step S15. Two of them are listed below:

[0048] The first type: prospective motion correction

[0049] Step A1: adjusting the currently applied gradient magnetic field according to the motion correction parameters so as to keep the target region of interest and the scanning field of view (FOV) relatively still.

[0050] exist Figure 2 In the example shown, after the first motion M1 is detected and the motion correction parameter Tform1.T corresponding to the first motion M1 is calculated, the currently applied gradient magnetic field is adjusted according to the motion correction parameter Tform1.T so that the target region of interest and the FOV remain relatively stationary; after the second motion M2 is detected and the motion correction parameter Tform2.T corresponding to the second motion M2 is calculated, the currently applied gradient magnetic field is adjusted according to the motion correction parameter Tform2.T so that the target region of interest and the FOV remain relatively stationary.

[0051] Step A2, restarting MR data acquisition from the position marked as motion-corrupted data until the MR data acquisition is completed, or when the next motion is detected using the pilot tone signal, returning to execute the operation of marking the MR data acquired when the motion occurs as motion-corrupted data.

[0052] exist Figure 2In the example shown, after the gradient magnetic field is adjusted according to the motion correction parameter Tform1.T corresponding to the first motion M1 in step A1, the MR data of the acquisition position corresponding to the small triangle mark S1 may be discarded in this step A2, and MR data acquisition may be restarted from the acquisition position corresponding to the first small triangle mark S1 until the second motion M2 is detected in step S12; after the gradient magnetic field is adjusted according to the motion correction parameter Tform2.T corresponding to the second motion M2 in step A1, the MR data of the acquisition position corresponding to the small triangle mark S2 may be discarded in this step A2, and MR data acquisition may be restarted from the acquisition position corresponding to the first small triangle mark S2 until the MR data acquisition is completed, or the next motion is detected using the pilot tone signal in step S12.

[0053] In specific implementation, before starting MR data acquisition each time, several dummy scans may be performed to maintain a stable state during MR scanning.

[0054] Second type: Retrospective motion correction

[0055] Step B1, restarting MR data acquisition from the position marked as motion-corrupted data until the MR data acquisition is completed, or when the next motion is detected using the pilot tone signal, returning to execute the operation of marking the MR data acquired when the motion occurs as motion-corrupted data.

[0056] exist Figure 2 In the example shown, after the first motion M1 is detected and the motion correction parameter Tform1.T corresponding to the first motion M1 is calculated, the MR data of the acquisition position corresponding to the small triangle mark S1 can be discarded, and MR data acquisition can be restarted from the acquisition position corresponding to the first small triangle mark S1 until the second motion M2 is detected in step S12; after the second motion M2 is detected and the motion correction parameter Tform2.T corresponding to the second motion M2 is calculated, the MR data of the acquisition position corresponding to the small triangle mark S2 can be discarded, and MR data acquisition can be restarted from the acquisition position corresponding to the first small triangle mark S2 until the MR data acquisition is completed or the next motion is detected using the pilot tone signal in step S12.

[0057] In specific implementation, before starting MR data acquisition each time, several dummy scans may be performed to maintain a stable state during MR scanning.

[0058] Step B2: When the MR data acquisition is finished, for each MR data acquired after a motion occurs, motion correction is performed on the acquired MR data using a running correction parameter corresponding to the motion.

[0059] exist Figure 2 In the example shown, for the MR data acquired after the first motion M1 occurs and before the second motion M2 occurs, motion correction is performed on the MR data using the operating correction parameter Tform1.T corresponding to the first motion M1; for the MR data acquired after the second motion M2 occurs (if no motion occurs subsequently), motion correction is performed on the MR data using the operating correction parameter Tform2.T corresponding to the second motion M2.

[0060] Afterwards, a current MR image can be obtained based on the MR data after motion correction and the MR data before motion damage data, so that the images acquired based on the respective sequences can be accurately corrected, thereby improving the MR imaging quality.

[0061] Furthermore, when the motion is detected using the pilot tone signal, an automatic voice command for reminding the patient to remain still may be triggered.

[0062] Furthermore, the number of detected movements can be counted. When the count value reaches a set threshold, a dialog box, an operation box, or a voice command pops up to ask the user whether he wants to stop scanning due to frequent movements. When the user replies "yes", the current MR data acquisition is stopped; when the user replies "no", the current MR data acquisition continues.

[0063] In addition, in other embodiments, the user may be provided with three predefined exercise amount options of large, medium and small, and the exercise amount that triggers the operation of acquiring a post-exercise navigation image may be determined based on the received user selection.

[0064] In this embodiment, according to the scanning sequence adopted by the current MR scan, the navigation image can be a 3D navigation image or a 2D navigation image, which can be determined according to actual conditions.

[0065] The method embodiment of the present invention is described in detail above. The device embodiment of the present invention is described in detail below. For details not disclosed in the device embodiment of the present invention, please refer to the corresponding description in the method embodiment of the present invention, and no further details will be given here.

[0066] Figure 4 FIG. 1 is an exemplary structural diagram of a motion correction device in MR imaging according to an embodiment of the present invention. Figure 4 As shown by the solid line portion in , the device may include: a motion detection module 410 and a control processing module 420.

[0067] The motion detection module 410 is used to perform motion detection using pilot tone signals received by multiple coils during MR data acquisition, and output a first signal when a motion is detected; and output a second signal when the motion is detected to be finished.

[0068] The control processing module 420 is used to control an MR data acquisition device to perform MR data acquisition on a target area of interest and obtain the MR data acquired by the MR data acquisition device; and before controlling the MR data acquisition device to perform MR data acquisition, control the MR data acquisition device to acquire a reference navigation image and obtain the reference navigation image; when receiving the first signal, mark the MR data acquired when the motion occurs as motion-damaged data; when receiving the second signal, control the MR data acquisition device to acquire a post-motion navigation image and obtain the post-motion navigation parameters, align the post-motion navigation image with the reference navigation image, and obtain motion correction parameters corresponding to the motion; and use the motion correction parameters to perform motion correction on the MR data acquisition.

[0069] In a specific implementation, the control and processing module 420 may include: a control module 421 and a processing module 422. In different implementations, the functions of the control module 421 and the processing module 422 may also be different.

[0070] For example, in one embodiment, the control module 421 is configured to control an MR data acquisition device to acquire MR data of a target region of interest, and before acquiring the MR data, control the MR data acquisition device to acquire a reference navigation image; upon receiving the second signal, control the MR data acquisition device to acquire a post-motion navigation image; upon acquiring a motion correction parameter, control the gradient magnetic field applied during the current MR imaging to be adjusted according to the motion correction parameter so that the target region of interest and the FOV remain relatively stationary, and control the MR data acquisition device to restart MR data acquisition from a position marked as motion-corrupted data. The processing module 422 is configured to receive the reference navigation image and MR data acquired by the MR data acquisition device, and upon receiving the first signal, mark the MR data acquired when the motion occurs as motion-corrupted data; upon acquiring a post-motion navigation image acquired by the MR data acquisition device, register the post-motion navigation image with the reference navigation image, obtain motion correction parameters corresponding to the motion, and provide the motion correction parameters to the control module.

[0071] In another embodiment, the control module 421 is used to control an MR data acquisition device to acquire MR data of a target region of interest, and before acquiring MR data, control the MR data acquisition device to acquire a reference navigation image; upon receiving the second signal, control the MR data acquisition device to acquire a post-motion navigation image; and then control the MR data acquisition device to restart MR data acquisition from the position marked as motion-corrupted data. The processing module 422 is used to receive the reference navigation image and MR data acquired by the MR data acquisition device, and upon receiving the first signal, mark the MR data acquired when the motion occurs as motion-corrupted data; upon acquiring the post-motion navigation image acquired by the MR data acquisition device, align the post-motion navigation image with the reference navigation image to obtain motion correction parameters corresponding to the motion; and when the MR data acquisition device ends MR data acquisition, motion correct the re-acquired MR data using the correction parameters corresponding to the motion for each MR data acquired after the motion occurs.

[0072] Afterwards, a current MR image can be obtained based on the MR data after motion correction and the MR data before motion damage data, so that the images acquired based on the respective sequences can be accurately corrected, thereby improving the MR imaging quality.

[0073] In addition, in other embodiments, Figure 4 As shown in the dotted part in FIG, the device may further include: a first reminder module 430, which is used to trigger an automatic voice command for reminding the patient to stay still when receiving the first signal.

[0074] In another embodiment, the device may further include: a second reminder module 440, which is used to count the number of detected movements based on the received first signal, and when the count value reaches a set threshold, pop up a dialog box or operation box or voice instruction to ask the user whether he wants to stop scanning due to frequent movements, and when receiving the user's reply indicating "yes", send a third signal to the control processing module 420; the control processing module 420 controls the MR data acquisition device to stop MR data acquisition based on the third signal.

[0075] In another embodiment, the device may further include: a configuration module 450, which is used to provide the user with three predefined exercise amount options of large, medium and small, and configure the exercise size that triggers the operation of sending the first signal for the motion detection module 410 based on the received user selection.

[0076] Figure 5 This is a schematic diagram of the structure of another motion correction device in MR imaging in an embodiment of the present application, which can be used to implement Figure 1or implement the method shown in Figure 4 The motion correction device in MR imaging is shown. Figure 5 As shown, the system may include: at least one memory 51, at least one processor 52. In addition, it may also include some other components, such as communication ports, etc. These components communicate via a bus 53.

[0077] Among them, at least one memory 51 is used to store computer programs. In one embodiment, the computer program can be understood to include Figure 4 The various modules of the motion correction device in MR imaging are shown. In addition, at least one memory 51 can also store an operating system, etc. The operating system includes but is not limited to: Android operating system, Symbian operating system, Windows operating system, Linux operating system, etc.

[0078] At least one processor 52 is configured to invoke a computer program stored in at least one memory 51 to execute the motion correction method for MR imaging described in the embodiments of the present application. The processor 52 may be a CPU, a processing unit / module, an ASIC, a logic module, or a programmable gate array. The processor 52 may receive and transmit data via the communication port.

[0079] Specifically, the at least one processor 52 is configured to call a computer program stored in the at least one memory 51 to enable the system to execute the operations of the motion correction method in MR imaging in any of the above embodiments.

[0080] It should be noted that not all steps and modules in the above processes and structure diagrams are required, and certain steps or modules can be omitted based on actual needs. The execution order of the steps is not fixed and can be adjusted as needed. The division of the modules is merely for the convenience of describing the functional division adopted. In actual implementation, a module can be implemented by multiple modules, and the functions of multiple modules can be implemented by the same module. These modules can be located in the same device or in different devices.

[0081] It is understood that the hardware modules in the above-mentioned embodiments can be implemented mechanically or electronically. For example, a hardware module may include a specially designed permanent circuit or logic device (such as a dedicated processor, such as an FPGA or ASIC) for performing a specific operation. The hardware module may also include a programmable logic device or circuit (such as a general-purpose processor or other programmable processor) temporarily configured by software to perform a specific operation. As for whether to implement the hardware module mechanically, or using a dedicated permanent circuit, or using a temporarily configured circuit (such as configured by software), it can be decided based on cost and time considerations.

[0082] In addition, embodiments of the present application also provide a computer-readable storage medium having a computer program stored thereon, the computer program being executable by a processor and implementing the motion correction method for MR imaging described in the embodiments of the present application. Specifically, a system or device equipped with a storage medium can be provided, the storage medium storing software program code that implements the functions of any of the aforementioned embodiments, and causing a computer (or CPU or MPU) of the system or device to read and execute the program code stored in the storage medium. Furthermore, instructions based on the program code can be used to cause an operating system, etc., operating on the computer to perform some or all of the actual operations. The program code read from the storage medium can also be written to a memory provided in an expansion board inserted into the computer or to a memory provided in an expansion unit connected to the computer, and then, based on the instructions of the program code, a CPU, etc., installed in the expansion board or expansion unit, to perform some or all of the actual operations, thereby implementing the functions of any of the aforementioned embodiments. Examples of storage media for providing the program code include floppy disks, hard disks, magneto-optical disks, optical disks (such as CD-ROMs, CD-Rs, CD-RWs, DVD-ROMs, DVD-RAMs, DVD-RWs, DVD+RWs), magnetic tapes, non-volatile memory cards, and ROMs. Alternatively, the program code may be downloaded from a server computer via a communications network.

[0083] As can be seen from the above scheme, since the embodiment of the present invention utilizes a pilot tone signal for motion detection and marks the MR data acquired when motion occurs as motion-corrupted data, a reference navigation image is acquired before acquiring MR data, and a post-motion navigation image is acquired when motion stops. The post-motion navigation image is configured with the reference navigation image to obtain motion correction parameters corresponding to the motion, and the gradient magnetic field is then adjusted using the motion correction parameters to complete prospective motion correction. MR data acquisition is then restarted from the position marked as motion-corrupted data; alternatively, MR data acquisition is directly restarted from the position marked as motion-corrupted data, and finally, the re-acquired data is retrospectively motion corrected using the motion correction parameters. The current MR image is then obtained based on the MR signal data after motion correction and the MR data before the motion-corrupted data, thereby enabling accurate correction of the acquired image and improving MR imaging quality.

[0084] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A motion correction method in MR imaging, characterized in that include: Before acquiring MR data of the target region of interest, a reference navigation image is acquired; During the process of acquiring MR data of the target region of interest, motion detection is performed using pilot tone signals received by multiple coils, and when motion is detected, the MR data acquired when the motion occurs is marked as motion-corrupted data; When the end of the movement is detected by using the pilot tone signal, acquiring a post-movement navigation image; Registering the post-movement navigation image with the reference navigation image to obtain motion correction parameters corresponding to the movement; The MR data acquisition is motion corrected using the motion correction parameters.

2. The motion correction method in MR imaging according to claim 1, characterized in that The performing motion correction on MR data acquisition using the motion correction parameters comprises: adjusting the currently applied gradient magnetic field according to the motion correction parameter so that the target region of interest and the scanning field of view remain relatively stationary; Restarting MR data acquisition from the position marked as motion-corrupted data until the MR data acquisition is completed, or when the next motion is detected using the pilot tone signal, returning to execute the operation of marking the MR data acquired when the motion occurs as motion-corrupted data.

3. The motion correction method in MR imaging according to claim 1, characterized in that: The performing motion correction on MR data acquisition using the motion correction parameters comprises: Restarting MR data acquisition from the position marked as motion-corrupted data until the MR data acquisition is completed or when the next motion is detected using the pilot tone signal, returning to the operation of marking the MR data acquired when the motion occurs as motion-corrupted data; At the end of the MR data acquisition, for each MR data acquired after a motion occurs, motion correction is performed on the acquired MR data using a running correction parameter corresponding to the motion.

4. The motion correction method in MR imaging according to any one of claims 1 to 3, characterized in that: Further including: When the motion is detected using the pilot tone signal, a reminder command for reminding the patient to remain still is triggered.

5. The motion correction method in MR imaging according to any one of claims 1 to 3, characterized in that: It further includes: counting the number of detected movements, and when the count value reaches a set threshold, the user determines whether to stop scanning, and when a reply indicating to stop scanning is received from the user, the current MR data acquisition is stopped; otherwise, the current MR data acquisition is continued.

6. The motion correction method in MR imaging according to any one of claims 1 to 3, characterized in that: Further including: It is used to provide the user with predefined gear options representing different sizes of exercise, and determine the exercise size that triggers the operation of obtaining a post-exercise navigation image based on the received user selection.

7. A motion correction device for MR imaging, characterized in that include: A motion detection module (410) is configured to perform motion detection using pilot tone signals received by a plurality of coils during MR data acquisition, and output a first signal when a motion is detected; When the end of the movement is detected, outputting a second signal; and A control processing module (420) is used to control an MR data acquisition device to acquire MR data of a target region of interest, and to obtain MR data acquired by the MR data acquisition device; Before controlling the MR data acquisition device to perform MR data acquisition, the MR data acquisition device is controlled to acquire a reference navigation image and obtain the reference navigation image; when the first signal is received, the MR data acquired when the motion occurs is marked as motion-damaged data; when the second signal is received, the MR data acquisition device is controlled to acquire a post-motion navigation image and obtain the post-motion navigation parameters, and the post-motion navigation image is aligned with the reference navigation image to obtain motion correction parameters corresponding to the motion; and the motion correction parameters are used to perform motion correction on the MR data acquisition.

8. The motion correction device in MR imaging according to claim 7, characterized in that: The control processing module (420) includes: A control module (421) is used to control an MR data acquisition device to acquire MR data of a target region of interest, and before acquiring the MR data, control the MR data acquisition device to acquire a reference navigation image; when receiving the second signal, control the MR data acquisition device to acquire a post-motion navigation image; when acquiring a motion correction parameter, control the gradient magnetic field applied by the current MR imaging to be adjusted according to the motion correction parameter so that the target region of interest and the scanning field of view remain relatively still, and control the MR data acquisition device to restart MR data acquisition from a position marked as motion-damaged data; and A processing module (422) is configured to receive a reference navigation image and MR data acquired by the MR data acquisition device, and when receiving the first signal, mark the MR data acquired when the motion occurs as motion-damaged data; when acquiring a post-motion navigation image acquired by the MR data acquisition device, align the post-motion navigation image with the reference navigation image to obtain motion correction parameters corresponding to the motion, and provide the motion correction parameters to the control module.

9. The motion correction device for MR imaging according to claim 7, characterized in that: The control processing module (420) includes: A control module (421) is used to control an MR data acquisition device to acquire MR data of a target area of interest, and before acquiring the MR data, control the MR data acquisition device to acquire a reference navigation image; when receiving the second signal, control the MR data acquisition device to acquire a post-motion navigation image, and then control the MR data acquisition device to restart MR data acquisition from a position marked as motion-damaged data; and The processing module (422) is configured to receive the reference navigation image and MR data acquired by the MR data acquisition device, and when receiving the first signal, mark the MR data acquired when the motion occurs as motion-damaged data; when acquiring the post-motion navigation image acquired by the MR data acquisition device, align the post-motion navigation image with the reference navigation image to obtain motion correction parameters corresponding to the motion; and when the MR data acquisition device finishes MR data acquisition, for each MR data acquired after the motion occurs, perform motion correction on the re-acquired MR data using the correction parameters corresponding to the motion.

10. The motion correction device in MR imaging according to any one of claims 7 to 9, characterized in that Further including: The first reminder module (430) is configured to trigger a reminder command for reminding the patient to remain still upon receiving the first signal.

11. The motion correction device for MR imaging according to any one of claims 7 to 9, characterized in that: Further including: a second reminder module (440), configured to count the number of detected movements according to the received first signal, and when the count value reaches a set threshold, the user determines whether to stop scanning, and when a reply indicating to stop scanning is received from the user, a third signal is sent to the control processing module; The control processing module (420) controls the MR data acquisition device to stop MR data acquisition according to the third signal.

12. The motion correction device for MR imaging according to any one of claims 7 to 9, characterized in that: Further including: The configuration module (450) is used to provide the user with predefined gear options representing different sizes of movement, and configure the movement size for triggering the operation of sending the first signal for the movement detection module (410) according to the received user selection.

13. A motion correction device for MR imaging, characterized in that: include: At least one memory (51) and at least one processor (52), wherein: The at least one memory (51) is used to store a computer program; The at least one processor (52) is configured to call a computer program stored in the at least one memory (51) to execute the motion correction method in MR imaging according to any one of claims 1 to 6.

14. A computer-readable storage medium having a computer program stored thereon; characterized in that: The computer program can be executed by a processor and implements the motion correction method in MR imaging according to any one of claims 1 to 6.

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