Image phase compensation method, computer equipment and magnetic resonance imaging device

Abstract

The invention relates to an image phase compensation method, computer equipment and a magnetic resonance imaging device. The method comprises the following steps: acquiring a plurality of imaging signals of an imaging object and the frequency drift amount of a magnetic resonance imaging system corresponding to each imaging signal; and determining a phase compensation amount according to each frequency drift amount, and determining a target magnetic resonance image according to each imaging signal and the corresponding phase compensation amount. By using the image phase compensation method provided by the invention, phase change caused by field drift can be compensated.

Description

Technical Field

[0001] The present application relates to the field of imaging technology, and in particular to an image phase compensation method, a computer device and a magnetic resonance imaging device. Background Art

[0002] When using an MRI system for long-term sequential scanning, the vibration caused by the continuous switching of the current will generate heat, which will cause the system frequency of the MRI system to drift. The accuracy of the system frequency will directly affect the quality of the scanned image. For example, the drift of the system frequency will cause the image position to shift and the fat suppression effect to be poor.

[0003] Currently, there are methods that can obtain the frequency drift of the magnetic resonance imaging system in real time and calibrate the system frequency of the magnetic resonance imaging system. However, the drift of the system frequency will affect the image phase, and there is currently a lack of methods to compensate for the image phase. Summary of the invention

[0004] Based on this, it is necessary to provide an image phase compensation method, a computer device and a magnetic resonance imaging device that can compensate for the image phase in order to solve the above technical problems.

[0005] In a first aspect, the present application provides an image phase compensation method, the method comprising:

[0006] Acquire multiple imaging signals of the imaging object and a frequency drift amount of the magnetic resonance imaging system corresponding to each imaging signal;

[0007] A phase compensation amount is determined according to each frequency drift amount, and a target magnetic resonance image is determined according to each imaging signal and the corresponding phase compensation amount.

[0008] In one embodiment, determining the phase compensation amount according to each frequency drift amount includes:

[0009] Acquiring the echo time of each imaging signal;

[0010] For each imaging signal, a phase compensation amount is determined according to a frequency drift amount corresponding to the imaging signal and an echo time of the imaging signal.

[0011] In one embodiment, determining a target magnetic resonance image according to each imaging signal and a corresponding phase compensation amount includes:

[0012] For each imaging signal, phase compensation is performed on the imaging signal according to the corresponding phase compensation amount to obtain a target signal;

[0013] Each target signal is reconstructed to obtain a target magnetic resonance image.

[0014] In one embodiment, acquiring a plurality of imaging signals of an imaging object and a frequency drift amount of a magnetic resonance imaging system corresponding to each imaging signal includes:

[0015] Applying a scanning sequence to the imaging object and acquiring a plurality of imaging signals and corresponding calibration signals based on the scanning sequence;

[0016] According to each calibration signal, the frequency drift amount corresponding to each imaging signal is determined.

[0017] In one embodiment, the scanning sequence includes a plurality of imaging sequences and a plurality of calibration sequences, the scanning sequence is applied to the imaging object, and a plurality of imaging signals and corresponding calibration signals are acquired based on the scanning sequence, including:

[0018] applying a plurality of imaging sequences to an imaging object, and acquiring a plurality of imaging signals based on the plurality of imaging sequences;

[0019] A plurality of calibration sequences are applied to the imaging subject, and a plurality of calibration signals are acquired based on the plurality of calibration sequences.

[0020] In one embodiment, the calibration signal includes a first echo signal and a second echo signal, and determining the frequency drift amount corresponding to each imaging signal according to each calibration signal includes:

[0021] For each calibration signal, determining a phase difference according to the first echo signal and the second echo signal;

[0022] The frequency drift amount is determined according to the phase difference and the time difference between the first echo signal and the second echo signal.

[0023] In a second aspect, an embodiment of the present application provides an image phase compensation method, the method comprising:

[0024] Acquiring the frequency drift of the magnetic resonance imaging system at the current scanning moment and the imaging signal of the imaging object;

[0025] Determining a phase compensation amount according to a frequency drift amount and an echo time of an imaging signal;

[0026] Performing phase compensation on the imaging signal according to the phase compensation amount to obtain a target signal, and reconstructing the target signal to obtain a first magnetic resonance image;

[0027] Calibrate the system frequency of the magnetic resonance imaging system based on the frequency drift at the current scanning moment to obtain a new system frequency;

[0028] Based on the new system frequency, the frequency drift of the magnetic resonance imaging system at the next scanning moment and the imaging signal of the imaging object are obtained, and the step of determining the phase compensation amount according to the frequency drift and the echo time of the imaging signal is returned to be executed until the scanning is completed and the target magnetic resonance image is obtained.

[0029] In a third aspect, an embodiment of the present application provides a magnetic resonance imaging device, the device comprising:

[0030] An acquisition module, used for acquiring a plurality of imaging signals of an imaging object and a frequency drift amount of the magnetic resonance imaging system corresponding to each imaging signal;

[0031] The determination module is used to determine the phase compensation amount according to each frequency drift amount, and determine the target magnetic resonance image according to each imaging signal and the corresponding phase compensation amount.

[0032] In a fourth aspect, an embodiment of the present application provides a computer device, including a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the steps of the methods provided in the first and second aspects are implemented.

[0033] In a fifth aspect, an embodiment of the present application further provides a magnetic resonance imaging system, comprising a magnetic resonance imaging device and a control component, wherein the magnetic resonance imaging device is communicatively connected to the control component, and the control component is used to execute the steps of the method provided in the first and second aspects above.

[0034] In a sixth aspect, the present application further provides a computer-readable storage medium, wherein a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method provided in the first aspect and the second aspect are implemented.

[0035] In a seventh aspect, the present application further provides a computer program product, which includes a computer program, and when the computer program is executed by a processor, the steps of the method provided in the first aspect and the second aspect are implemented.

[0036] The above-mentioned image phase compensation method, computer equipment and magnetic resonance imaging device, the method obtains multiple imaging signals of the imaging object and the frequency drift amount of the magnetic resonance imaging system corresponding to each imaging signal; determines the phase compensation amount according to each frequency drift amount, and determines the target magnetic resonance image according to each imaging signal and the corresponding phase compensation amount. In this embodiment, the phase compensation amount corresponding to each imaging signal can be determined by the frequency drift amount corresponding to each imaging signal, and the phase compensation amount can be used to compensate for the phase change caused by the system frequency drift, which can improve the quality of the determined target magnetic resonance image, thereby improving the practicality of the image phase compensation method. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 is a schematic structural diagram of a magnetic resonance imaging system in one embodiment;

[0038] Figure 2 A schematic diagram of a process flow of an image phase compensation method in one embodiment;

[0039] Figure 3 A schematic diagram of the steps of an image phase compensation method in another embodiment;

[0040] Figure 4 A schematic diagram of the steps of an image phase compensation method in another embodiment;

[0041] Figure 5 A schematic diagram of the steps of an image phase compensation method in another embodiment;

[0042] Figure 6 A schematic diagram of the steps of an image phase compensation method in another embodiment;

[0043] Figure 7 A schematic diagram of the steps of an image phase compensation method in another embodiment;

[0044] Figure 8 A schematic diagram of the steps of an image phase compensation method in another embodiment;

[0045] Fig. 9 is a schematic diagram of an imaging sequence applied in one embodiment;

[0046] Fig.10 A schematic diagram of the steps of an image phase compensation method in another embodiment;

[0047] Fig.11 is a schematic structural diagram of a magnetic resonance imaging device in one embodiment;

[0048] Fig.12 FIG. 4 is a diagram showing the internal structure of a computer device in one embodiment. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0050] The serial numbers assigned to the components in this article, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning.

[0051] First, before specifically introducing the technical solutions of the embodiments disclosed in the present application, the background technology or technical evolution context based on the embodiments of the present application is introduced. In the field of magnetic resonance imaging, when a magnetic resonance imaging system is used for long-term sequence scanning, heat will be generated due to the vibration caused by the continuous switching of the current, which will cause the system frequency of the magnetic resonance imaging system to drift. The accuracy of the system frequency will directly affect the quality of the scanned image. For example, the drift of the system frequency will cause the image position to shift, the fat suppression effect is poor, etc., which will affect the research results of researchers based on the image. At present, there is a method for obtaining the frequency drift of the magnetic resonance imaging system in real time and calibrating the system frequency of the magnetic resonance imaging system. However, the drift of the system frequency will bring about changes in the image phase. For most magnetic resonance imaging methods using amplitude images, the change of phase is not important, but in magnetic resonance imaging methods that consider phase images, phase stability is very important, such as magnetic resonance elastography (MRE) method. MRE needs to calculate the displacement based on the phase change, and then calculate the tissue elasticity. The additional phase change caused by the system frequency offset will cause errors in the calculation of tissue elasticity, resulting in inaccurate magnetic resonance images. However, the current method for calibrating the system frequency cannot calibrate the image phase change caused by field drift, that is, there is currently a lack of a method for compensating the image phase caused by field drift. In this regard, the present application provides an image phase compensation method.

[0052] The image phase compensation method provided in the present application can be applied to a magnetic resonance imaging system, the structure of which is as follows: Figure 1 As shown, it includes a magnetic resonance imaging device 104 and a control component 103. The control component 103 can communicate with the magnetic resonance imaging device 104 through a network. The control component 103 and the magnetic resonance imaging device 104 can be integrated, or the magnetic resonance imaging device 104 can be externally connected to the control component 103. The control component 103 can be, but is not limited to, various personal computers, laptops, and tablet computers. This embodiment does not limit the type of the magnetic resonance imaging device 104, as long as it can achieve its functions.

[0053] The technical solution of the present application and how the technical solution of the present application solves the technical problem are described in detail below with specific embodiments.

[0054] In one embodiment, Figure 2 As shown, an image phase compensation method is provided. This embodiment uses the method applied to a control component as an example. In this embodiment, the method includes the following steps:

[0055] Step 200: Acquire a plurality of imaging signals of an imaging object and a frequency drift of a magnetic resonance imaging system corresponding to each imaging signal.

[0056] The multiple imaging signals of the imaging object are signals obtained by the magnetic resonance imaging device in the magnetic resonance imaging system when scanning the imaging object. The frequency drift of the magnetic resonance imaging system refers to the drift used to calibrate the drift of the system frequency of the magnetic resonance imaging device, that is, the frequency drift of the main magnetic field of the magnetic resonance imaging device. The system frequency of the magnetic resonance imaging device may refer to the center frequency of the magnetic resonance imaging device before the magnetic resonance imaging device scans, also known as the reference frequency. The imaging signal corresponds to the frequency drift of the magnetic resonance imaging system. That is, the magnetic resonance imaging system scans the imaging object based on the initial system frequency to obtain a first imaging signal, which corresponds to the first frequency drift. Usually, the first frequency drift is zero; the initial system frequency is calibrated according to the first frequency drift, and the calibrated initial system frequency is used as the new initial system frequency. The magnetic resonance imaging system scans the imaging object based on the initial system frequency to obtain a second imaging signal, which corresponds to the second frequency drift; the initial system frequency is calibrated according to the second frequency drift; the above steps are repeated until the scanning of the imaging object is completed, and multiple imaging signals and corresponding frequency drifts can be obtained.

[0057] The multiple imaging signals of the imaging object and the frequency drift amount of the magnetic resonance imaging system corresponding to each imaging signal can be obtained by the magnetic resonance imaging system scanning the imaging object in advance and stored. It can also be that the magnetic resonance imaging system scans and obtains the imaging object and transmits it to the control component in real time. The multiple imaging signals and the corresponding frequency drift amount can be pre-stored in the memory of the magnetic resonance imaging system, and the control component obtains them from the memory of the magnetic resonance imaging system when needed. The multiple imaging signals and the corresponding frequency drift amount can also be obtained by the magnetic resonance imaging system and sent to the control component, and stored in the memory of the control component, and the control component can directly obtain them from its memory when needed. This embodiment does not limit the specific method of obtaining multiple imaging signals and the corresponding frequency drift amount, as long as its function can be achieved.

[0058] Step 210: determine a phase compensation amount according to each frequency drift amount, and determine a target magnetic resonance image according to each imaging signal and the corresponding phase compensation amount.

[0059] After obtaining the frequency drift amount corresponding to each imaging signal, the control component can determine the phase compensation amount of the corresponding imaging signal according to the frequency drift amount, that is, the phase compensation amount corresponding to each imaging signal can be obtained. This embodiment does not limit the specific method of determining the phase compensation amount according to each frequency drift amount, as long as its function can be achieved.

[0060] After determining the phase compensation amount corresponding to each imaging signal, the control component uses the phase compensation amount to compensate the phase in the imaging signal before imaging in the process of image reconstruction according to the imaging signal, so as to obtain a target magnetic resonance image of the imaging object. Specifically, in the process of image reconstruction according to the imaging signal, it is necessary to remove the high-order phase, the first-order phase and the zero-order phase in the imaging signal, and after removing the high-order phase, the first-order phase and the zero-order phase in the imaging signal, the phase compensation amount is used to compensate for them.

[0061] The image phase compensation method provided in the embodiment of the present application obtains multiple imaging signals of the imaging object and the frequency drift amount of the magnetic resonance imaging system corresponding to each imaging signal; determines the phase compensation amount according to each frequency drift amount, and determines the target magnetic resonance image according to each imaging signal and the corresponding phase compensation amount. In this embodiment, the phase compensation amount corresponding to each imaging signal can be determined by the frequency drift amount corresponding to each imaging signal, and the phase compensation amount can be used to compensate for the phase change caused by the system frequency drift, which can improve the quality of the determined target magnetic resonance image, thereby improving the practicality of the image phase compensation method.

[0062] In one embodiment, Figure 3 As shown, it is related to an implementation method of determining the phase compensation amount according to each frequency drift amount, and the steps of the implementation method include:

[0063] Step 300: Acquire the echo time of each imaging signal.

[0064] The echo time of the imaging signal refers to the time interval from the excitation of the radio frequency pulse to the acquisition of the imaging signal. Specifically, the echo time of each imaging signal is the time interval between the peak of the radio frequency pulse and the peak of the imaging signal. The echo time of each imaging signal can be acquired at the same time as the imaging signal is acquired. The echo signal of the imaging signal can be stored corresponding to the imaging signal, that is, the echo time of the imaging signal can be stored in the memory of the magnetic resonance imaging system, and can also be stored in the memory of the control component. When the control component needs it, it can be directly obtained from the memory of the magnetic resonance imaging system or the memory of the control component.

[0065] Step 310: For each imaging signal, determine a phase compensation amount according to a frequency drift amount corresponding to the imaging signal and an echo time of the imaging signal.

[0066] After acquiring the echo time of each imaging signal and determining the frequency drift amount of each imaging signal, the control component can determine the phase compensation amount of each imaging signal acquired based on the echo time of the imaging signal and the corresponding frequency drift amount, thereby determining the phase compensation amounts corresponding to multiple imaging signals.

[0067] In an optional embodiment, it is assumed that the echo time of the imaging signal is recorded as TE, and the corresponding frequency drift is recorded as , phase compensation It can be expressed as ,in, .

[0068] In this embodiment, the echo time of each imaging signal is obtained; for each imaging signal, the phase compensation amount is determined according to the frequency drift amount corresponding to the imaging signal and the echo time of the imaging signal. This method of determining the phase compensation amount is quick and easy to implement, and can improve the efficiency of phase compensation for imaging signals, thereby improving the practicality of the image phase compensation method.

[0069] In one embodiment, Figure 4 As shown, it is related to an implementation method of determining a target magnetic resonance image according to each imaging signal and a corresponding phase compensation amount, and the steps of the implementation method include:

[0070] Step 400: For each imaging signal, phase compensation is performed on the imaging signal according to the corresponding phase compensation amount to obtain a target signal.

[0071] After obtaining the phase compensation amount of each imaging signal, the control component selects an imaging signal to be processed from multiple imaging signals, and obtains the phase compensation amount corresponding to the determined imaging signal, and performs phase compensation on the imaging signal according to the phase compensation amount to obtain a target signal; the above steps are repeated until all imaging signals are phase compensated to obtain multiple target signals.

[0072] In an optional embodiment, the control component performs Fourier transform on the imaging signal to obtain a transformed imaging signal; and compensates the phase of the transformed imaging signal according to the phase compensation amount to obtain a target signal.

[0073] Step 410: reconstruct each target signal to obtain a target magnetic resonance image.

[0074] After determining multiple target signals, the control component reconstructs each target signal to obtain a magnetic resonance image corresponding to the target signal, thereby obtaining multiple magnetic resonance images corresponding to each target signal. The control component matches multiple magnetic resonance images to obtain a target magnetic resonance image of the imaging object. This embodiment does not limit the specific method of reconstructing each target signal to obtain a target magnetic resonance image, as long as its function can be achieved.

[0075] In this embodiment, for each imaging signal, the imaging signal is phase compensated according to the corresponding phase compensation amount to obtain a target signal; each target signal is reconstructed to obtain a target magnetic resonance image. This method for determining the target magnetic resonance image is quick and easy to implement, and can improve the efficiency of determining the target magnetic resonance image; and using the target signal after phase compensation to determine the target magnetic resonance image can improve the quality of the determined target magnetic resonance image, thereby improving the practicality of the image phase compensation method.

[0076] In one embodiment, Figure 5 As shown, it is related to an implementation method of acquiring multiple imaging signals of an imaging object and a frequency drift amount of a magnetic resonance imaging system corresponding to each imaging signal, and the steps of the implementation method include:

[0077] Step 500: Apply a scanning sequence to an imaging object, and acquire a plurality of imaging signals and corresponding calibration signals based on the scanning sequence.

[0078] The control component sends a control signal to the magnetic resonance imaging device in the magnetic resonance imaging system, so that the magnetic resonance imaging device applies a scanning sequence to the imaging object, and based on the scanning sequence, collects multiple imaging signals corresponding to the imaging object, and calibration signals corresponding to each imaging signal. That is to say, while collecting one imaging signal, one calibration signal is collected, and the number of imaging signals is the same as the number of calibration signals. After collecting multiple imaging signals and corresponding calibration signals, the magnetic resonance imaging device sends the imaging signals and corresponding calibration signals to the control component. The imaging signal is used to determine the magnetic resonance image of the imaging object, and the calibration signal is used to determine the frequency drift corresponding to the imaging signal.

[0079] Step 510: Determine the frequency drift corresponding to each imaging signal according to each calibration signal.

[0080] After acquiring multiple calibration signals, the control component can determine the frequency drift of the corresponding imaging signal according to the calibration signals. The frequency drift can be used to calibrate the system frequency of the magnetic resonance imaging system, so that the magnetic resonance imaging system can subsequently apply a scanning sequence to the imaging object based on the calibrated system frequency.

[0081] In this embodiment, a scanning sequence is applied to the imaging object, and multiple imaging signals and corresponding calibration signals are obtained based on the scanning sequence; the frequency drift amount corresponding to each imaging signal is determined according to each calibration signal. In this way, by applying the scanning sequence to the imaging object, both the imaging signal and the calibration signal for determining the frequency drift amount can be obtained, which can improve the efficiency of determining the frequency drift amount, thereby improving the practicality of the image phase compensation method.

[0082] In one embodiment, the scanning sequence includes multiple imaging sequences and multiple calibration sequences. The calibration sequence can be a calibration sequence applied after the imaging sequence is applied to the imaging object and the scanning of the imaging object is completed; it can also be a calibration sequence applied to the imaging object within a repetition time (TR) after the imaging sequence is applied to the imaging object. The number of imaging sequences included in the scanning sequence can be the same as the number of calibration sequences. This embodiment does not limit the types of imaging sequences and calibration sequences, and the number of imaging sequences and calibration sequences applied to the imaging object, as long as their functions can be achieved.

[0083] In an optional embodiment, for each imaging sequence and calibration sequence, if the calibration sequence is a calibration sequence applied after the imaging sequence is applied to the imaging object and the scanning of the imaging object is completed, the imaging sequence may include a first radio frequency pulse, a first layer selection gradient, a phase encoding gradient, and a first readout encoding gradient; the calibration sequence may include a second radio frequency pulse, a second layer selection gradient, and a second readout encoding gradient. The second radio frequency pulse may be the same as or different from the first radio frequency pulse; the second layer selection gradient may be the same as or different from the first layer selection gradient; the second readout encoding gradient may be the same as or different from the first readout encoding gradient. If the calibration sequence is a calibration sequence applied to the imaging object within the repetition time of the imaging sequence, the imaging sequence may include a third radio frequency pulse, a third layer selection gradient, a phase encoding gradient, and a third readout encoding gradient; the calibration sequence may include a fourth readout encoding gradient. The fourth readout encoding gradient may be the same as or different from the third readout encoding gradient.

[0084] In the case where the control component controls the magnetic resonance imaging apparatus to apply a scanning sequence to the imaging subject, the scanning sequence includes a plurality of imaging sequences and a plurality of calibration sequences. Figure 6 As shown, a method for implementing a scanning sequence to an imaging object and acquiring a plurality of imaging signals and corresponding calibration signals based on the scanning sequence includes the following steps:

[0085] Step 600: Apply multiple imaging sequences to an imaging object, and acquire multiple imaging signals based on the multiple imaging sequences.

[0086] For each applied imaging sequence, the control component collects imaging signals of the imaging object based on the imaging sequence after controlling the magnetic resonance imaging device to apply the imaging sequence to the imaging object, thereby collecting multiple imaging signals. Specifically, the magnetic resonance imaging device collects imaging signals of the imaging object based on the first readout encoding gradient or the third readout encoding gradient in the imaging sequence. After collecting multiple imaging signals, the magnetic resonance imaging device sends the multiple imaging signals to the control component.

[0087] Step 610: Apply multiple calibration sequences to the imaging object, and acquire multiple calibration signals based on the multiple calibration sequences.

[0088] For each applied calibration sequence, the control component acquires a calibration signal based on the calibration sequence after controlling the magnetic resonance imaging device to apply the calibration sequence to the imaging object, so that multiple calibration signals can be acquired. Specifically, the magnetic resonance imaging device acquires the calibration signal based on the second readout encoding gradient or the fourth readout encoding gradient in the calibration sequence. After acquiring multiple calibration signals, the magnetic resonance imaging device sends the multiple calibration signals to the control component.

[0089] In an optional embodiment, a scanning sequence is applied to the imaging object, and a plurality of imaging signals are acquired based on the scanning sequence, and a specific implementation method of the corresponding calibration signal may include: a control component controls the magnetic resonance imaging device to apply a first imaging sequence and a first calibration sequence to the imaging object, acquires a first imaging signal based on the first imaging sequence, and acquires a first calibration signal based on the first calibration sequence; the control component determines a frequency drift amount based on the first calibration signal; calibrates the system frequency of the magnetic resonance imaging system according to the frequency drift amount; the control component controls the magnetic resonance imaging device to apply a second imaging sequence and a second calibration sequence to the imaging object based on the calibrated system frequency, and repeats the above steps until the scanning of the imaging object is completed, thereby obtaining a plurality of imaging signals and a plurality of calibration signals.

[0090] In this embodiment, multiple imaging sequences are applied to the imaging object, and multiple imaging signals are obtained based on the multiple imaging sequences; multiple calibration sequences are applied to the imaging object, and multiple calibration signals are obtained based on the multiple calibration sequences. This method of obtaining imaging signals and calibration signals is fast and easy to implement, and can improve the efficiency and practicality of the image phase compensation method.

[0091] In one embodiment, when the second readout encoding gradient or the fourth readout encoding gradient applied to the imaging object is a dual gradient, the acquired calibration signal may include a first echo signal and a second echo signal.

[0092] In the case where the calibration signal includes a first echo signal and a second echo signal, Figure 7As shown, it is related to an implementation method of determining the frequency drift amount corresponding to each imaging signal according to each calibration signal, and the steps of the implementation method include:

[0093] Step 700: For each calibration signal, determine a phase difference according to a first echo signal and a second echo signal.

[0094] After acquiring multiple calibration signals, the control component determines the phase difference for each calibration signal according to the first echo signal and the second echo signal included in the calibration signal. This embodiment does not limit the specific method of determining the phase difference according to the first echo signal and the second echo signal, as long as its function can be achieved.

[0095] In an optional embodiment, the control component may input the first echo signal and the second echo signal into a preset phase function to determine the phase difference.

[0096] In another optional embodiment, the control component can perform Fourier transform on the first echo signal to obtain a first complex signal in the complex domain, perform Fourier transform on the second echo signal to obtain a second complex signal in the complex domain, and calculate the phase difference between the first complex signal and the second complex signal to obtain the phase difference. Specifically, the phase difference can be obtained by conjugate multiplying the first complex signal and the second complex signal.

[0097] Step 710: Determine the frequency drift amount according to the phase difference and the time difference between the first echo signal and the second echo signal.

[0098] The time difference between the first echo signal and the second echo signal refers to the time difference between the peak of the first echo signal and the peak of the second echo signal. After determining the phase difference between the first complex signal and the second complex signal, the control component can determine the frequency drift amount according to the phase difference and the time difference between the first echo signal and the second echo signal. Specifically, the direct correspondence between the frequency f and the phase angle θ can be expressed as , represents the time difference between the first echo signal and the second echo signal. The frequency drift can be expressed as .

[0099] In this embodiment, for each calibration signal, the phase difference is determined based on the first echo signal and the second echo signal; the frequency drift is determined based on the phase difference and the time difference between the first echo signal and the second echo signal. This method for determining the frequency drift is quick and easy to implement, and can improve the efficiency of determining the phase compensation amount, thereby improving the practicability of the image phase compensation method.

[0100] See also Figure 8An embodiment of the present application provides an image phase compensation method, the method comprising the steps of:

[0101] Step 800: applying an imaging sequence and a calibration sequence to an imaging object, acquiring an imaging signal of the imaging object based on the imaging sequence, and acquiring a calibration signal based on the calibration sequence; the calibration signal includes a first echo signal and a second echo signal;

[0102] Step 810: Perform Fourier transform on the first echo signal to obtain a first complex signal; perform Fourier transform on the second echo signal to obtain a second complex signal;

[0103] Step 820: determining a phase difference according to the first complex signal and the second complex signal; and determining a frequency drift amount according to the phase difference and a time difference between the first echo signal and the second echo signal;

[0104] Step 830, calibrating the system frequency of the magnetic resonance imaging system based on the frequency drift, and repeatedly performing the above steps 800 to 830 based on the calibrated system frequency until the scanning of the imaging object is completed, and a plurality of imaging signals and the frequency drift corresponding to each imaging signal are obtained;

[0105] Step 840: Acquire the echo time of each imaging signal, and for each imaging signal, perform phase compensation on the imaging signal according to the corresponding phase compensation amount to obtain a target signal;

[0106] Step 850: reconstruct each target signal to obtain a target magnetic resonance image.

[0107] For the description of the above steps 800 to 850, reference may be made to the specific description of the above embodiment, which will not be repeated here.

[0108] In an optional embodiment, the imaging sequence applied to the imaging subject is as follows: Fig.10 As shown. The imaging sequence includes radio frequency pulse RF, slice gradient G SS , multiple phase encoding gradients G in opposite directions PE , read out the encoding gradient G RO , and the gray gradient represents the phase gradient. The imaging signal Echo is obtained based on the readout encoding gradient acquisition in the imaging sequence. Fig. 9 As shown, at time t0, the system frequency is F0 and the frequency drift is is zero, the phase compensation amount (Phase) of the imaging signal is zero; after a period of scanning, t n Frequency drift If is not zero, then the phase compensation of the imaging signal is also not zero, which can be expressed as .

[0109] In one embodiment, Fig.10 As shown, the present application provides an image phase compensation method, and this embodiment uses the method applied to a control component as an example. In this embodiment, the steps of the method include:

[0110] Step 1001: Acquire the frequency drift of the magnetic resonance imaging system at the current scanning moment and the imaging signal of the imaging object.

[0111] The control component obtains the frequency drift amount of the magnetic resonance imaging system at the current scanning moment and the imaging signal during the process of controlling the magnetic resonance imaging device in the magnetic resonance imaging system to scan the imaging object. The description of obtaining the frequency drift amount at the current scanning moment and the imaging signal can refer to the specific description of the above embodiment, which will not be repeated here.

[0112] Step 1002: determining a phase compensation amount according to a frequency drift amount and an echo time of an imaging signal;

[0113] The control component can obtain the echo time of the imaging signal while obtaining the imaging signal. After obtaining the frequency drift amount and the echo time of the imaging signal at the current scanning moment, the control component can determine the phase compensation amount corresponding to the imaging signal according to the frequency drift amount and the echo time of the imaging signal. For the description of determining the phase compensation amount according to the frequency drift amount and the echo time of the imaging signal, reference can be made to the specific description of the above embodiment, which will not be repeated here.

[0114] Step 1003: perform phase compensation on the imaging signal according to the phase compensation amount to obtain a target signal, and reconstruct the target signal to obtain a first magnetic resonance image.

[0115] After determining the phase compensation amount corresponding to the imaging signal at the current scanning moment, the control component performs phase compensation on the imaging signal according to the phase compensation amount to obtain a target signal. The target signal is reconstructed to obtain a first magnetic resonance image. The first magnetic resonance image may be a two-dimensional magnetic resonance image. For the description of performing phase compensation on the imaging signal according to the phase compensation amount to determine the target signal, and reconstructing the target signal to obtain the first magnetic resonance image, reference may be made to the specific description of the above embodiment, which will not be repeated here.

[0116] Step 1004: calibrate the system frequency of the magnetic resonance imaging system based on the frequency drift at the current scanning moment to obtain a new system frequency.

[0117] After obtaining the frequency drift at the current scanning moment, the control component can calibrate the system frequency of the magnetic resonance imaging system based on the frequency drift to obtain a calibrated system frequency, that is, a new reference frequency. For the description of calibrating the system frequency according to the frequency drift, reference can be made to the specific description of the above embodiment, which will not be repeated here.

[0118] Step 1005: Based on the new system frequency, the frequency drift of the magnetic resonance imaging system at the next scanning moment and the imaging signal of the imaging object are obtained, and the step of determining the phase compensation amount according to the frequency drift and the echo time of the imaging signal is returned to be executed until the scanning is completed and the target magnetic resonance image is obtained.

[0119] After acquiring the new system frequency, the control component controls the magnetic resonance imaging device in the magnetic resonance imaging system to scan the imaging sequence based on the new system frequency, obtains the frequency drift amount at the next scanning moment, and the imaging signal, and returns to execute steps 1002-1005 until the scanning of the imaging object is completed, and multiple first magnetic resonance images can be obtained. By matching the multiple first magnetic resonance images, the target magnetic resonance image of the imaging object can be determined.

[0120] In this embodiment, the phase compensation amount corresponding to the imaging signal can be determined by the frequency drift amount corresponding to the imaging signal, and the phase compensation amount can be used to compensate for the phase change caused by the system frequency drift, which can improve the quality of the determined target magnetic resonance image. In addition, during the scanning process of the imaging object, the system frequency of the magnetic resonance imaging system can be calibrated in real time by the determined frequency drift amount, thereby improving the accuracy of the acquired imaging signal, and further improving the quality of the determined target magnetic resonance image.

[0121] In one embodiment, the present application provides a magnetic resonance imaging system, such as Figure 1 As shown, the magnetic resonance imaging system includes a magnetic resonance imaging device 104 and a control component 103. The magnetic resonance imaging device 104 and the control component 103 are communicatively connected, and the control component 103 is used to execute the steps of the method provided in the above embodiment.

[0122] The steps of the method executed by the control component 103 in the magnetic resonance imaging system can refer to the specific description of the above embodiment, which will not be repeated here.

[0123] The control component in the magnetic resonance imaging system provided in this embodiment is used for the steps of the method performed in the above embodiment, so the magnetic resonance imaging system has all the beneficial effects of the method provided in the above embodiment, which will not be described in detail here.

[0124] It should be understood that, although the various steps in the flowcharts involved in the above-mentioned embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-mentioned embodiments can include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0125] Based on the same inventive concept, the embodiment of the present application also provides a magnetic resonance imaging device for implementing the above-mentioned image phase compensation method. The implementation solution provided by the device to solve the problem is similar to the implementation solution recorded in the above-mentioned method, so the specific limitations in one or more magnetic resonance imaging device embodiments provided below can refer to the limitations of the image phase compensation method above, and will not be repeated here.

[0126] In one embodiment, Fig.11 As shown, a magnetic resonance imaging device 10 is provided, comprising: an acquisition module 11 and a determination module 12, wherein:

[0127] The acquisition module 11 is used to acquire a plurality of imaging signals of the imaging object and a frequency drift of the magnetic resonance imaging system corresponding to each imaging signal.

[0128] The determination module 12 is used to determine the phase compensation amount according to each frequency drift amount, and determine the target magnetic resonance image according to each imaging signal and the corresponding phase compensation amount.

[0129] In one embodiment, the determination module 12 includes an acquisition unit and a first determination unit. The acquisition unit is used to acquire the echo time of each imaging signal. The first determination unit is used to determine the phase compensation amount for each imaging signal according to the frequency drift amount corresponding to the imaging signal and the echo time of the imaging signal.

[0130] In one embodiment, the determination module 12 further includes a compensation unit and a reconstruction unit. The compensation unit is used to perform phase compensation on each imaging signal according to the corresponding phase compensation amount to obtain a target signal. The reconstruction unit is used to reconstruct each target signal to obtain a target magnetic resonance image.

[0131] In one embodiment, the acquisition module 11 includes an application unit and a second determination unit. The application unit is used to apply a scanning sequence to the imaging object and acquire multiple imaging signals and corresponding calibration signals based on the scanning sequence. The second determination unit is used to determine the frequency drift corresponding to each imaging signal according to each calibration signal.

[0132] In one embodiment, the applying unit is specifically configured to apply multiple imaging sequences to the imaging object and acquire multiple imaging signals based on the multiple imaging sequences; and apply multiple calibration sequences to the imaging object and acquire multiple calibration signals based on the multiple calibration sequences.

[0133] In one embodiment, the second determination unit is specifically configured to determine, for each calibration signal, a phase difference according to the first echo signal and the second echo signal; and determine a frequency drift amount according to the phase difference and a time difference between the first echo signal and the second echo signal.

[0134] In one embodiment, another magnetic resonance imaging device is provided, comprising: a signal acquisition module, a compensation amount determination module, a reconstruction module, a calibration module and an execution module.

[0135] The signal acquisition module is used to acquire the frequency drift of the magnetic resonance imaging system at the current scanning moment and the imaging signal of the imaging object.

[0136] The compensation amount determination module is used to determine the phase compensation amount according to the frequency drift amount and the echo time of the imaging signal.

[0137] The reconstruction module is used to perform phase compensation on the imaging signal according to the phase compensation amount to obtain a target signal, and reconstruct the target signal to obtain a first magnetic resonance image.

[0138] The calibration module is used to calibrate the system frequency of the magnetic resonance imaging system based on the frequency drift at the current scanning moment to obtain a new system frequency.

[0139] The execution module is used to obtain the frequency drift of the magnetic resonance imaging system at the next scanning moment and the imaging signal of the imaging object based on the new system frequency, and return to execute the step of determining the phase compensation amount according to the frequency drift and the echo time of the imaging signal until the scanning is completed to obtain the target magnetic resonance image.

[0140] Each module in the above-mentioned magnetic resonance imaging device can be implemented in whole or in part by software, hardware or a combination thereof. Each module can be embedded in or independent of a processor in a computer device in the form of hardware, or can be stored in a memory in a computer device in the form of software, so that the processor can call and execute operations corresponding to each module.

[0141] In one embodiment, a computer device is provided, whose internal structure diagram can be as follows: Fig.12 As shown. The computer device includes a processor, a memory, a communication interface, a display screen and an input device connected through a system bus. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The communication interface of the computer device is used to communicate with an external terminal in a wired or wireless manner, and the wireless manner can be achieved through WIFI, a mobile cellular network, NFC (near field communication) or other technologies. When the computer program is executed by the processor, an image phase compensation method is implemented. The display screen of the computer device can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer device can be a touch layer covered on the display screen, or a key, trackball or touchpad set on the computer device shell, or an external keyboard, touchpad or mouse.

[0142] Those skilled in the art will understand that Fig.12 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0143] In one embodiment, a computer device is provided, including a memory and a processor, wherein a computer program is stored in the memory, and when the processor executes the computer program, the following steps are implemented:

[0144] Acquire multiple imaging signals of the imaging object and a frequency drift amount of the magnetic resonance imaging system corresponding to each imaging signal;

[0145] A phase compensation amount is determined according to each frequency drift amount, and a target magnetic resonance image is determined according to each imaging signal and the corresponding phase compensation amount.

[0146] In one embodiment, when the processor executes the computer program, the following steps are also implemented: acquiring the echo time of each imaging signal; for each imaging signal, determining the phase compensation amount according to the frequency drift amount corresponding to the imaging signal and the echo time of the imaging signal.

[0147] In one embodiment, when the processor executes the computer program, the following steps are also implemented: for each imaging signal, phase compensation is performed on the imaging signal according to the corresponding phase compensation amount to obtain a target signal; and each target signal is reconstructed to obtain a target magnetic resonance image.

[0148] In one embodiment, when the processor executes the computer program, the following steps are also implemented: applying a scanning sequence to the imaging object, and acquiring multiple imaging signals and corresponding calibration signals based on the scanning sequence; and determining the frequency drift corresponding to each imaging signal according to each calibration signal.

[0149] In one embodiment, when the processor executes the computer program, the following steps are also implemented: applying multiple imaging sequences to the imaging object, and acquiring multiple imaging signals based on the multiple imaging sequences; applying multiple calibration sequences to the imaging object, and acquiring multiple calibration signals based on the multiple calibration sequences.

[0150] In one embodiment, when the processor executes the computer program, the following steps are also implemented: for each calibration signal, a phase difference is determined according to the first echo signal and the second echo signal; and a frequency drift is determined according to the phase difference and the time difference between the first echo signal and the second echo signal.

[0151] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0152] Acquiring the frequency drift of the magnetic resonance imaging system at the current scanning moment and the imaging signal of the imaging object;

[0153] Determining a phase compensation amount according to a frequency drift amount and an echo time of an imaging signal;

[0154] Performing phase compensation on the imaging signal according to the phase compensation amount to obtain a target signal, and reconstructing the target signal to obtain a first magnetic resonance image;

[0155] Calibrate the system frequency of the magnetic resonance imaging system based on the frequency drift at the current scanning moment to obtain a new system frequency;

[0156] Based on the new system frequency, the frequency drift of the magnetic resonance imaging system at the next scanning moment and the imaging signal of the imaging object are obtained, and the step of determining the phase compensation amount according to the frequency drift and the echo time of the imaging signal is returned to be executed until the scanning is completed and the target magnetic resonance image is obtained.

[0157] In one embodiment, a computer readable storage medium is provided, on which a computer program is stored, and when the computer program is executed by a processor, the following steps are implemented:

[0158] Acquire multiple imaging signals of the imaging object and a frequency drift amount of the magnetic resonance imaging system corresponding to each imaging signal;

[0159] A phase compensation amount is determined according to each frequency drift amount, and a target magnetic resonance image is determined according to each imaging signal and the corresponding phase compensation amount.

[0160] In one embodiment, when the computer program is executed by the processor, the following steps are also implemented: acquiring the echo time of each imaging signal; for each imaging signal, determining the phase compensation amount according to the frequency drift amount corresponding to the imaging signal and the echo time of the imaging signal.

[0161] In one embodiment, when the computer program is executed by the processor, the following steps are also implemented: for each imaging signal, phase compensation is performed on the imaging signal according to the corresponding phase compensation amount to obtain a target signal; and each target signal is reconstructed to obtain a target magnetic resonance image.

[0162] In one embodiment, when the computer program is executed by the processor, the following steps are also implemented: applying a scanning sequence to the imaging object, and acquiring multiple imaging signals and corresponding calibration signals based on the scanning sequence; and determining the frequency drift corresponding to each imaging signal according to each calibration signal.

[0163] In one embodiment, when the computer program is executed by the processor, the following steps are also implemented: applying multiple imaging sequences to the imaging object, and acquiring multiple imaging signals based on the multiple imaging sequences; applying multiple calibration sequences to the imaging object, and acquiring multiple calibration signals based on the multiple calibration sequences.

[0164] In one embodiment, when the computer program is executed by the processor, the following steps are also implemented: for each calibration signal, a phase difference is determined based on the first echo signal and the second echo signal; and a frequency drift is determined based on the phase difference and the time difference between the first echo signal and the second echo signal.

[0165] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0166] Acquiring the frequency drift of the magnetic resonance imaging system at the current scanning moment and the imaging signal of the imaging object;

[0167] Determining a phase compensation amount according to a frequency drift amount and an echo time of an imaging signal;

[0168] Performing phase compensation on the imaging signal according to the phase compensation amount to obtain a target signal, and reconstructing the target signal to obtain a first magnetic resonance image;

[0169] Calibrate the system frequency of the magnetic resonance imaging system based on the frequency drift at the current scanning moment to obtain a new system frequency;

[0170] Based on the new system frequency, the frequency drift of the magnetic resonance imaging system at the next scanning moment and the imaging signal of the imaging object are obtained, and the step of determining the phase compensation amount according to the frequency drift and the echo time of the imaging signal is returned to be executed until the scanning is completed and the target magnetic resonance image is obtained.

[0171] In one embodiment, a computer program product is provided, comprising a computer program, which, when executed by a processor, implements the following steps:

[0172] Acquire multiple imaging signals of the imaging object and a frequency drift amount of the magnetic resonance imaging system corresponding to each imaging signal;

[0173] A phase compensation amount is determined according to each frequency drift amount, and a target magnetic resonance image is determined according to each imaging signal and the corresponding phase compensation amount.

[0174] In one embodiment, when the computer program is executed by the processor, the following steps are also implemented: acquiring the echo time of each imaging signal; for each imaging signal, determining the phase compensation amount according to the frequency drift amount corresponding to the imaging signal and the echo time of the imaging signal.

[0175] In one embodiment, when the computer program is executed by the processor, the following steps are also implemented: for each imaging signal, phase compensation is performed on the imaging signal according to the corresponding phase compensation amount to obtain a target signal; and each target signal is reconstructed to obtain a target magnetic resonance image.

[0176] In one embodiment, when the computer program is executed by the processor, the following steps are also implemented: applying a scanning sequence to the imaging object, and acquiring multiple imaging signals and corresponding calibration signals based on the scanning sequence; and determining the frequency drift corresponding to each imaging signal according to each calibration signal.

[0177] In one embodiment, when the computer program is executed by the processor, the following steps are also implemented: applying multiple imaging sequences to the imaging object, and acquiring multiple imaging signals based on the multiple imaging sequences; applying multiple calibration sequences to the imaging object, and acquiring multiple calibration signals based on the multiple calibration sequences.

[0178] In one embodiment, when the computer program is executed by the processor, the following steps are also implemented: for each calibration signal, a phase difference is determined based on the first echo signal and the second echo signal; and a frequency drift is determined based on the phase difference and the time difference between the first echo signal and the second echo signal.

[0179] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0180] Acquiring the frequency drift of the magnetic resonance imaging system at the current scanning moment and the imaging signal of the imaging object;

[0181] Determining a phase compensation amount according to a frequency drift amount and an echo time of an imaging signal;

[0182] Performing phase compensation on the imaging signal according to the phase compensation amount to obtain a target signal, and reconstructing the target signal to obtain a first magnetic resonance image;

[0183] Calibrate the system frequency of the magnetic resonance imaging system based on the frequency drift at the current scanning moment to obtain a new system frequency;

[0184] Based on the new system frequency, the frequency drift of the magnetic resonance imaging system at the next scanning moment and the imaging signal of the imaging object are obtained, and the step of determining the phase compensation amount according to the frequency drift and the echo time of the imaging signal is returned to be executed until the scanning is completed and the target magnetic resonance image is obtained.

[0185] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but are not limited to this.

[0186] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0187] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. An image phase compensation method, characterized in that: The method comprises: Acquiring a plurality of imaging signals of an imaging object and a frequency drift amount of the magnetic resonance imaging system corresponding to each of the imaging signals; A phase compensation amount is determined according to each of the frequency drift amounts, and a target magnetic resonance image is determined according to each of the imaging signals and the corresponding phase compensation amount.

2. The method according to claim 1, characterized in that: The determining of the phase compensation amount according to each of the frequency drift amounts comprises: Acquiring the echo time of each imaging signal; For each of the imaging signals, the phase compensation amount is determined according to a frequency drift amount corresponding to the imaging signal and an echo time of the imaging signal.

3. The method according to claim 2, characterized in that Determining a target magnetic resonance image according to each of the imaging signals and the corresponding phase compensation amount includes: For each of the imaging signals, phase compensation is performed on the imaging signal according to the corresponding phase compensation amount to obtain a target signal; Each of the target signals is reconstructed to obtain the target magnetic resonance image.

4. The method according to any one of claims 1 to 3, characterized in that The step of acquiring a plurality of imaging signals of the imaging object and a frequency drift amount of the magnetic resonance imaging system corresponding to each of the imaging signals comprises: Applying a scanning sequence to the imaging object, and acquiring a plurality of imaging signals and corresponding calibration signals based on the scanning sequence; The frequency drift amount corresponding to each of the imaging signals is determined according to each of the calibration signals.

5. The method according to claim 4, characterized in that The scanning sequence includes a plurality of imaging sequences and a plurality of calibration sequences, and applying the scanning sequence to the imaging object and acquiring a plurality of imaging signals and corresponding calibration signals based on the scanning sequence includes: Applying the multiple imaging sequences to the imaging object, and acquiring a plurality of the imaging signals based on the multiple imaging sequences; The plurality of calibration sequences are applied to the imaging object, and a plurality of calibration signals are acquired based on the plurality of calibration sequences.

6. The method according to claim 4, characterized in that The calibration signal includes a first echo signal and a second echo signal, and determining the frequency drift amount corresponding to each imaging signal according to each calibration signal includes: For each of the calibration signals, determining a phase difference according to the first echo signal and the second echo signal; The frequency drift amount is determined according to the phase difference and the time difference between the first echo signal and the second echo signal.

7. An image phase compensation method, characterized in that: The method comprises: Acquiring the frequency drift of the magnetic resonance imaging system at the current scanning moment and the imaging signal of the imaging object; Determining a phase compensation amount according to the frequency drift amount and the echo time of the imaging signal; Performing phase compensation on the imaging signal according to the phase compensation amount to obtain a target signal, and reconstructing the target signal to obtain a first magnetic resonance image; Calibrate the system frequency of the magnetic resonance imaging system based on the frequency drift at the current scanning moment to obtain a new system frequency; Based on the new system frequency, the frequency drift of the magnetic resonance imaging system at the next scanning moment and the imaging signal of the imaging object are obtained, and the step of determining the phase compensation amount according to the frequency drift and the echo time of the imaging signal is returned to be executed until the scanning is completed and the target magnetic resonance image is obtained.

8. A magnetic resonance imaging device, characterized in that: The device comprises: An acquisition module, used for acquiring a plurality of imaging signals of an imaging object and a frequency drift amount of the magnetic resonance imaging system corresponding to each of the imaging signals; The determination module is used to determine the phase compensation amount according to each of the frequency drift amounts, and to determine the target magnetic resonance image according to each of the imaging signals and the corresponding phase compensation amount.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 7 are implemented.

10. A magnetic resonance imaging system, characterized in that: The method comprises a magnetic resonance imaging device and a control component, wherein the magnetic resonance imaging device is communicatively connected to the control component, and the control component is used to execute the steps of the method according to any one of claims 1 to 7.

Images