Magnetic resonance signal correction method and device and magnetic resonance imaging system

Abstract

The invention relates to a magnetic resonance signal correction method and device and a magnetic resonance imaging system. The method comprises the following steps: acquiring an original free induction attenuation signal of target equipment; determining a magnetic resonance signal correction curve of the target equipment according to the original free induction decay signal; and according to the magnetic resonance signal correction curve, correcting a to-be-corrected magnetic resonance signal collected by the target device to obtain a corrected magnetic resonance signal corresponding to the to-be-corrected magnetic resonance signal. By adopting the method, multiplicative noise interference of magnetic resonance signals can be removed, and the quality of magnetic resonance imaging is improved.

Description

Technical Field

[0001] This application relates to the field of magnetic resonance technology, and in particular to a method and apparatus for correcting magnetic resonance signals and a magnetic resonance imaging system. Background Art

[0002] Nuclear magnetic resonance uses a strong external magnetic field to cause the protons of the subject to generate a macroscopic magnetization vector. Through radio frequency pulse excitation, the macroscopic magnetization vector precesses around the magnetic field direction to generate magnetic resonance signals. By reconstructing the collected magnetic resonance signals, a magnetic resonance image of the subject can be obtained.

[0003] However, due to possible inherent defects in magnetic resonance equipment, multiplicative noise interference exists in the generated magnetic resonance signals, affecting the quality of magnetic resonance imaging.

[0004] Therefore, there is a problem of being affected by multiplicative noise interference in current magnetic resonance imaging technology. Summary of the Invention

[0005] Based on this, it is necessary to provide a method and apparatus for correcting magnetic resonance signals, a computer device, a computer-readable storage medium, a computer program product, and a magnetic resonance imaging system that can remove multiplicative noise for the above technical problems.

[0006] In a first aspect, this application provides a method for correcting magnetic resonance signals. The method includes:

[0007] Obtain the original free induction decay signal of the target device;

[0008] Determine the magnetic resonance signal correction curve of the target device according to the original free induction decay signal;

[0009] Correct the magnetic resonance signal to be corrected collected by the target device according to the magnetic resonance signal correction curve to obtain the corrected magnetic resonance signal corresponding to the magnetic resonance signal to be corrected.

[0010] In one embodiment, the obtaining the original free induction decay signal of the target device includes:

[0011] Determine the first free induction decay signal of the target device when the readout gradient is turned off;

[0012] Obtain the original free induction decay signal of the target device according to the first free induction decay signal.

[0013] In one embodiment, the determining the magnetic resonance signal correction curve of the target device according to the original free induction decay signal includes:

[0014] Fitting is performed according to the signal amplitude of the original free induction decay signal to obtain the target fitting function of the original free induction decay signal;

[0015] According to the target fitting function, determine the second free induction decay signal of the target device;

[0016] According to the second free induction decay signal and the original free induction decay signal, obtain the magnetic resonance signal correction curve of the target device.

[0017] In one embodiment, the fitting according to the signal amplitude of the original free induction decay signal to obtain the target fitting function of the original free induction decay signal includes:

[0018] Perform non-linear least squares fitting according to the signal amplitude to determine the parameter vector of the target fitting function;

[0019] According to the parameter vector, obtain the target fitting function of the original free induction decay signal.

[0020] In one embodiment, the parameter vector includes a transverse magnetization vector, a time offset, a relaxation time, and an amplitude offset.

[0021] In one embodiment, the obtaining the magnetic resonance signal correction curve of the target device according to the second free induction decay signal and the original free induction decay signal includes:

[0022] Obtain the magnetic resonance signal correction curve according to the ratio of the original free induction decay signal to the second free induction decay signal.

[0023] In one embodiment, the correcting the magnetic resonance signal to be corrected collected by the target device according to the magnetic resonance signal correction curve to obtain the corrected magnetic resonance signal corresponding to the magnetic resonance signal to be corrected includes:

[0024] Determine the correction coefficient of the magnetic resonance signal to be corrected according to the magnetic resonance signal correction curve;

[0025] Correct the magnetic resonance signal to be corrected according to the correction coefficient to obtain the corrected magnetic resonance signal.

[0026] In a second aspect, the present application also provides a magnetic resonance signal correction device. The device includes:

[0027] An acquisition module, configured to acquire an original free induction decay signal of a target device;

[0028] A determination module, configured to determine a magnetic resonance signal correction curve of the target device according to the original free induction decay signal;

[0029] A correction module, configured to correct the magnetic resonance signal to be corrected collected by the target device according to the magnetic resonance signal correction curve, so as to obtain a corrected magnetic resonance signal corresponding to the magnetic resonance signal to be corrected.

[0030] In a third aspect, the present application further provides a computer device. The computer device includes a memory and a processor. The memory stores a computer program. When the processor executes the computer program, the following steps are implemented:

[0031] Obtain the original free induction decay signal of the target device;

[0032] Determine a magnetic resonance signal correction curve of the target device according to the original free induction decay signal;

[0033] Correct the magnetic resonance signal to be corrected collected by the target device according to the magnetic resonance signal correction curve, so as to obtain a corrected magnetic resonance signal corresponding to the magnetic resonance signal to be corrected.

[0034] In a fourth aspect, the present application further provides a computer-readable storage medium. The computer-readable storage medium stores a computer program. When the computer program is executed by a processor, the following steps are implemented:

[0035] Obtain the original free induction decay signal of the target device;

[0036] Determine a magnetic resonance signal correction curve of the target device according to the original free induction decay signal;

[0037] Correct the magnetic resonance signal to be corrected collected by the target device according to the magnetic resonance signal correction curve, so as to obtain a corrected magnetic resonance signal corresponding to the magnetic resonance signal to be corrected.

[0038] In a fifth aspect, the present application further provides a computer program product. The computer program product includes a computer program. When the computer program is executed by a processor, the following steps are implemented:

[0039] Obtain the original free induction decay signal of the target device;

[0040] Determine a magnetic resonance signal correction curve of the target device according to the original free induction decay signal;

[0041] According to the magnetic resonance signal correction curve, correct the magnetic resonance signal to be corrected collected by the target device to obtain the corrected magnetic resonance signal corresponding to the magnetic resonance signal to be corrected.

[0042] In a sixth aspect, the present application further provides a magnetic resonance imaging system. The system includes:

[0043] A bed body for carrying a target object;

[0044] A radio frequency transmitting coil for transmitting radio frequency pulses to the target object;

[0045] A gradient coil for generating a gradient field;

[0046] A radio frequency receiving coil for receiving the magnetic resonance signal to be corrected;

[0047] A processor for correcting the magnetic resonance signal to be corrected according to a pre-determined magnetic resonance signal correction curve to obtain a corrected magnetic resonance signal; the magnetic resonance signal correction curve is determined according to the original free induction decay signal of the magnetic resonance imaging system.

[0048] The above-mentioned magnetic resonance signal correction method, device, computer device, storage medium, computer program product and magnetic resonance imaging system obtain the original free induction decay signal of the target device, determine the magnetic resonance signal correction curve of the target device according to the original free induction decay signal, and correct the magnetic resonance signal to be corrected collected by the target device according to the magnetic resonance signal correction curve to obtain the corrected magnetic resonance signal corresponding to the magnetic resonance signal to be corrected; the magnetic resonance signal correction curve can be determined according to the original free induction decay signal of the magnetic resonance device, and the magnetic resonance signal collected by the magnetic resonance device is corrected by using the magnetic resonance signal correction curve to remove the multiplicative noise interference of the magnetic resonance signal and improve the quality of magnetic resonance imaging. Description of the Drawings

[0049] Figure 1 It is a schematic flowchart of a magnetic resonance signal correction method in an embodiment;

[0050] Figure 2 It is a schematic flowchart of a magnetic resonance signal correction method in another embodiment;

[0051] Figure 3 It is a structural block diagram of a magnetic resonance signal correction device in an embodiment;

[0052] Figure 4 It is an internal structure diagram of a computer device in an embodiment. Detailed Embodiments

[0053] To make the objectives, technical solutions, and advantages of this application clearer and more understandable, the following further elaborates on this application in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely used to explain this application and are not used to limit this application.

[0054] In one embodiment, as Figure 1 shown, a method for correcting magnetic resonance signals is provided. In this embodiment, it is exemplified that this method is applied to a terminal. It can be understood that this method can also be applied to a server, or to a system including a terminal and a server, and is implemented through the interaction between the terminal and the server. In this embodiment, the method includes the following steps:

[0055] Step S110: Obtain the original free induction decay signal of the target device.

[0056] Among them, the target device can be, but is not limited to, a magnetic resonance device.

[0057] Among them, the original free induction decay signal can be the originally collected free induction decay signal.

[0058] In specific implementation, the original free induction decay signal collected by the target device can be input into the terminal, so that the terminal obtains the original free induction decay signal of the target device.

[0059] In practical applications, a magnetic resonance device can first generate a radio frequency pulse to excite the macroscopic transverse magnetization vector, and then turn off the readout gradient to make the macroscopic transverse magnetization vector form free induction decay. The magnetic resonance device can record the free induction decay of the macroscopic transverse magnetization vector, form the original free induction decay signal, and input the original free induction decay signal into the terminal. Affected by the inherent defects of the magnetic resonance device, there may be noise interference in the original free induction decay signal. For example, multiplicative noise interference.

[0060] Step S120: Determine the magnetic resonance signal correction curve of the target device according to the original free induction decay signal.

[0061] Among them, the magnetic resonance signal correction curve can be a curve for correcting the noise in the original free induction decay signal.

[0062] In specific implementation, the terminal can fit the free induction decay signal without noise, and determine the magnetic resonance signal correction curve that can correct the noise interference in the original free induction decay signal according to the original free induction decay signal and the free induction decay signal without noise.

[0063] In practical applications, the amplitude of the original free induction decay signal can be expressed as S noise (t), and the amplitude of the free induction decay signal without noise can be expressed as

[0064]

[0065] where k 1 is the transverse magnetization vector, k 2 is the time offset constant, k 3 is the T2* relaxation time, k 4 is the amplitude offset constant, and t is the sampling time. According to S noise (t) and S 0 (t), the magnetic resonance signal correction curve C cali (t) of the target device can be obtained. The specific formula is

[0066] C cali (t) = s noise (t) / S 0 (t).

[0067] Step S130: According to the magnetic resonance signal correction curve, correct the magnetic resonance signal to be corrected collected by the target device to obtain the corrected magnetic resonance signal corresponding to the magnetic resonance signal to be corrected.

[0068] Among them, the magnetic resonance signal to be corrected can be the magnetic resonance signal collected by the target device in real time.

[0069] Among them, the corrected magnetic resonance signal can be the magnetic resonance signal with noise interference removed.

[0070] In specific implementation, the terminal can obtain the magnetic resonance signal collected by the target device, use this magnetic resonance signal as the magnetic resonance signal to be corrected, and use the magnetic resonance signal correction curve to correct the magnetic resonance signal to be corrected to obtain the corrected magnetic resonance signal.

[0071] In practical applications, the signal collected by the magnetic resonance device can be expressed as S ori (t). Taking it as the magnetic resonance signal to be corrected and using the magnetic resonance signal correction curve C cali (t) to correct the magnetic resonance signal to be corrected, the corrected magnetic resonance signal is

[0072] S cali (t) = S ori (t) / C cali (t).

[0073] The above-mentioned magnetic resonance signal correction method obtains the original free induction decay signal of the target device, determines the magnetic resonance signal correction curve of the target device according to the original free induction decay signal, and corrects the magnetic resonance signal to be corrected collected by the target device according to the magnetic resonance signal correction curve, so as to obtain the corrected magnetic resonance signal corresponding to the magnetic resonance signal to be corrected. The magnetic resonance signal correction curve can be determined according to the original free induction decay signal of the magnetic resonance device, and the magnetic resonance signal collected by the magnetic resonance device can be corrected by using the magnetic resonance signal correction curve to remove the multiplicative noise interference of the magnetic resonance signal and improve the quality of magnetic resonance imaging.

[0074] In one embodiment, the above step S110 may specifically include: determining the first free induction decay signal of the target device when the readout gradient is turned off; obtaining the original free induction decay signal of the target device according to the first free induction decay signal.

[0075] Among them, the first free induction decay signal may be the measured value of the free induction decay signal.

[0076] In specific implementation, the terminal can control the magnetic resonance device to first generate a radio frequency pulse to excite the macroscopic transverse magnetization vector, and then turn off the readout gradient to make the macroscopic transverse magnetization vector form free induction decay, record the free induction decay of the macroscopic transverse magnetization vector, and obtain the first free induction decay signal. Affected by the inherent defects of the magnetic resonance device, there may be noise interference in the first free induction decay signal, and the terminal can use the first free induction decay signal as the original free induction decay signal.

[0077] In practical applications, after turning off the readout gradient, the terminal can measure the amplitude S noise (t) of the free induction decay signal and use it as the amplitude of the original free induction decay signal.

[0078] In this embodiment, by determining the first free induction decay signal of the target device when the readout gradient is turned off and obtaining the original free induction decay signal of the target device according to the first free induction decay signal, a free induction decay signal containing noise interference can be obtained, and the magnetic resonance signal correction curve can be determined by using this signal to realize the correction of the magnetic resonance signal.

[0079] In one embodiment, the above step S120 may specifically include: performing fitting according to the signal amplitude of the original free induction decay signal to obtain the target fitting function of the original free induction decay signal; determining the second free induction decay signal of the target device according to the target fitting function; and obtaining the magnetic resonance signal correction curve of the target device according to the second free induction decay signal and the original free induction decay signal.

[0080] Among them, the signal amplitude can be the amplitude of the original free induction decay signal.

[0081] Among them, the target fitting function can be the fitting function of the signal amplitude of the original free induction decay signal.

[0082] Among them, the second free induction decay signal can be the theoretical value of the free induction decay signal.

[0083] In specific implementation, the terminal can fit the target fitting function of the free induction decay signal according to the signal amplitude of the original free induction decay signal to obtain the specific values of the parameter vector of the target fitting function. Since the target fitting function reflects the theoretical value of the free induction decay signal amplitude and there is no noise interference, the specific values of the parameter vector can be substituted into the target fitting function to obtain the second free induction decay signal. According to the ratio of the original free induction decay signal to the second free induction decay signal, the magnetic resonance signal correction curve can be obtained.

[0084] In practical applications, the target fitting function can be

[0085]

[0086] Among them, S 0 is the theoretical value of the free induction decay signal amplitude, k 1 is the transverse magnetization vector, k 2 is the time offset constant, k 3 is the T2* relaxation time, k 4 is the amplitude offset constant, and t is the sampling time. Taking [k 1 k 2 k 3 k 4 as the parameter vector, fitting the target fitting function according to S noise (t). For example, non-linear fitting can be performed through non-linear least squares methods, including but not limited to algorithms such as Levenberg-Margquardt, to obtain the specific values of the parameter vector [k 1 k 2 k 3 k 4 . Substituting the specific values of [k 1 k 2 k 3 k 4 into the target fitting function, the theoretical value of the free induction decay signal amplitude Taking it as the amplitude of the second free induction decay signal, the calculation formula of the magnetic resonance signal correction curve can be

[0087] C cali (t) = S noise(t) / S 0 (t).

[0088] In this embodiment, by fitting according to the signal amplitude of the original free induction decay signal, the target fitting function of the original free induction decay signal is obtained. According to the target fitting function, the second free induction decay signal of the target device is determined. According to the second free induction decay signal and the original free induction decay signal, the magnetic resonance signal correction curve of the target device is obtained. The second free induction decay signal without noise can be fitted based on the original free induction decay signal. Since the original free induction decay signal can be regarded as the measured value of the free induction decay signal, and the second free induction decay signal can be regarded as the theoretical value of the free induction decay signal, the measured magnetic resonance signal with noise can be corrected according to the ratio of the two, and the denoised magnetic resonance signal close to the theory can be obtained.

[0089] In one embodiment, the step of fitting according to the signal amplitude of the original free induction decay signal to obtain the target fitting function of the original free induction decay signal may specifically include: performing non-linear least squares fitting according to the signal amplitude to determine the parameter vector of the target fitting function; obtaining the target fitting function of the original free induction decay signal according to the parameter vector.

[0090] Among them, the parameter vector may include the transverse magnetization vector, time offset, relaxation time, and amplitude offset.

[0091] In specific implementation, the terminal may perform non-linear least squares fitting on the target fitting function according to the signal amplitude S noise (t) of the original free induction decay signal to obtain the specific values of the parameter vector [k k 1 k 2 k 3 k 4 . Substitute the specific values of [k 1 k 2 k 3 k 4 into the target fitting function to obtain the target fitting function Among them, k 1 is the transverse magnetization vector, k 2 is the time offset constant, k 3 is the T2* relaxation time, k 4 is the amplitude offset constant, and t is the sampling time.

[0092] In this embodiment, by performing non - linear least - squares fitting based on the signal amplitude to determine the parameter vector of the target fitting function, and obtaining the target fitting function of the original free induction decay signal according to the parameter vector, the theoretical value of the free induction decay signal amplitude can be obtained by fitting the original free induction decay signal. Since the theoretical value does not contain noise, the actually collected free induction decay signal can be corrected using the theoretical value.

[0093] In one embodiment, the step of obtaining the magnetic resonance signal correction curve of the target device according to the second free induction decay signal and the original free induction decay signal may specifically include: obtaining the magnetic resonance signal correction curve according to the ratio of the original free induction decay signal to the second free induction decay signal.

[0094] In specific implementation, the terminal can obtain the magnetic resonance signal correction curve according to the ratio of the original free induction decay signal (representing the measured value of the free induction decay signal, including noise) to the second free induction decay signal (representing the theoretical value of the free induction decay signal, without noise).

[0095] In practical applications, the calculation formula of the magnetic resonance signal correction curve can be

[0096] C cali (t) = S noise (t) / S 0 (t).

[0097] Wherein, S noise (t) is the amplitude of the original free induction decay signal, and S 0 (t) is the amplitude of the second free induction decay signal.

[0098] In this embodiment, by obtaining the magnetic resonance signal correction curve according to the ratio of the original free induction decay signal to the second free induction decay signal, the magnetic resonance signal can be corrected according to the magnetic resonance signal correction curve, improving the efficiency of magnetic resonance signal correction.

[0099] In one embodiment, the above - mentioned step S130 may specifically include: determining the correction coefficient of the magnetic resonance signal to be corrected according to the magnetic resonance signal correction curve; correcting the magnetic resonance signal to be corrected according to the correction coefficient to obtain the corrected magnetic resonance signal.

[0100] Among them, the correction coefficient can be a coefficient used to correct the magnetic resonance signal.

[0101] In specific implementation, the terminal can use the reciprocal of the magnetic resonance signal correction curve as the correction coefficient. When it is necessary to correct the magnetic resonance signal to be corrected, multiply the correction coefficient by the magnetic resonance signal to be corrected to obtain the corrected magnetic resonance signal.

[0102] In practical applications, after determining the magnetic resonance signal correction curve C caki (t), 1 / C cali (t) can be used as the correction coefficient. When it is necessary to correct the magnetic resonance signal to be corrected, according to S cali (t) = S ori (t) / C cali (t), the corrected magnetic resonance signal S cali (t) is obtained.

[0103] In this embodiment, by determining the correction coefficient of the magnetic resonance signal to be corrected according to the magnetic resonance signal correction curve; correcting the magnetic resonance signal to be corrected according to the correction coefficient to obtain the corrected magnetic resonance signal, the magnetic resonance signal can be corrected according to the magnetic resonance signal correction curve, and the efficiency of magnetic resonance signal correction is improved.

[0104] To facilitate those skilled in the art to deeply understand the embodiments of the present application, the following will be described with a specific example.

[0105] Figure 2 Another flowchart of the magnetic resonance signal correction method is provided. According to Figure 2 , the magnetic resonance signal correction method includes the following steps:

[0106] Step S210, turn off the readout gradient and measure the amplitude S noise (t) of the free induction decay signal containing multiplicative noise interference;

[0107] Step S220, calculate the free induction decay signal without noise through non-linear fitting. Let the expression of the amplitude S 0 (t) of the free induction decay signal without noise be:

[0108]

[0109] where k 1 is the transverse magnetization vector, k 2 is the time bias constant, k 3 is the T2* relaxation time, k 4 is the amplitude bias constant, and t is the sampling time. Taking [k 1 k 2 k 3 k 4 as the parameter vector, using the non-linear least squares algorithm, for example, the Levenberg-Margquardt algorithm, taking S noise (t) as the observation vector, as the known functional relationship, calculate the parameter vector [k 1 k2 k 3 k 4 , and then substitute the parameter vector [k 1 k 2 k 3 k 4 and the sampling time t into the expression of the amplitude of the free induction decay signal without noise to calculate the amplitude S of the free induction decay signal without noise 0 (t);

[0110] Step S230, calculate the correction curve through the following formula

[0111] C cali (t) = S noise (t) / S 0 (t);

[0112] Step S240, correct the magnetic resonance signal by using the correction curve. For example, if the magnetic resonance signal obtained in the magnetic resonance measurement is S ori (t), then the corrected magnetic resonance signal is

[0113] S cali (t) = S ori (t) / C cali (t).

[0114] The above magnetic resonance signal correction method can correct the multiplicative interference noise in the magnetic resonance signal, improve the quality of the magnetic resonance signal, and thus improve the quality of the finally obtained magnetic resonance image.

[0115] It should be understood that although the steps in the flowcharts involved in the above-described embodiments are shown in sequence according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless there is a clear indication in this article, the execution of these steps has no strict order limit, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-described embodiments may include multiple steps or multiple stages. These steps or stages are not necessarily executed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be executed alternately or alternately with at least a part of other steps or steps in other steps.

[0116] In one embodiment, a magnetic resonance imaging system is provided, including: a bed body, a radio frequency transmitting coil, a gradient coil, a radio frequency receiving coil, and a processor; wherein,

[0117] The bed body is used to carry the target object;

[0118] The radio frequency transmitting coil is used to transmit radio frequency pulses to the target object;

[0119] Gradient coil, for generating a gradient field;

[0120] Radio frequency receiving coil, for receiving the magnetic resonance signal to be corrected;

[0121] Processor, for correcting the magnetic resonance signal to be corrected according to a pre-determined magnetic resonance signal correction curve to obtain a corrected magnetic resonance signal; the magnetic resonance signal correction curve is determined according to the original free induction decay signal of the magnetic resonance imaging system.

[0122] In the embodiments of the present application, the target object may be an experimental animal.

[0123] In a specific implementation, the radio frequency transmitting coil may transmit radio frequency pulses to the target object on the bed body, the gradient coil generates a gradient field, and the magnetic resonance signal received by the radio frequency receiving coil is used as the magnetic resonance signal S ori (t) to be input into the processor, and the processor corrects S cali (t) according to the pre-determined magnetic resonance signal correction curve C ori (t) to obtain the corrected magnetic resonance signal S cali (t) = S ori (t) / C cali (t).

[0124] In one embodiment, the above-mentioned processor is further configured to determine a first free induction decay signal of the target device when the readout gradient is turned off; and obtain the original free induction decay signal of the target device according to the first free induction decay signal.

[0125] In one embodiment, the above-mentioned processor is further configured to perform fitting according to the signal amplitude of the original free induction decay signal to obtain a target fitting function of the original free induction decay signal; determine a second free induction decay signal of the target device according to the target fitting function; and obtain the magnetic resonance signal correction curve of the target device according to the second free induction decay signal and the original free induction decay signal.

[0126] In one embodiment, the above-mentioned processor is further configured to perform non-linear least squares fitting according to the signal amplitude to determine a parameter vector of the target fitting function; and obtain the target fitting function of the original free induction decay signal according to the parameter vector.

[0127] In one embodiment, the above-mentioned parameter vector includes a transverse magnetization vector, a time offset, a relaxation time, and an amplitude offset.

[0128] In one embodiment, the above-mentioned processor is further configured to obtain the magnetic resonance signal correction curve according to the ratio of the original free induction decay signal to the second free induction decay signal.

[0129] In one embodiment, the above-mentioned processor is further configured to determine a correction coefficient of the magnetic resonance signal to be corrected according to the magnetic resonance signal correction curve; and correct the magnetic resonance signal to be corrected according to the correction coefficient to obtain the corrected magnetic resonance signal.

[0130] The above-mentioned magnetic resonance imaging system obtains the original free induction decay signal of the target device, determines the magnetic resonance signal correction curve of the target device according to the original free induction decay signal, and corrects the magnetic resonance signal to be corrected collected by the target device according to the magnetic resonance signal correction curve to obtain the corrected magnetic resonance signal corresponding to the magnetic resonance signal to be corrected; the magnetic resonance signal correction curve can be determined according to the original free induction decay signal of the magnetic resonance device, and the magnetic resonance signal collected by the magnetic resonance device is corrected by using the magnetic resonance signal correction curve to remove the multiplicative noise interference of the magnetic resonance signal and improve the quality of magnetic resonance imaging.

[0131] Based on the same inventive concept, an embodiment of the present application further provides a magnetic resonance signal correction device for implementing the above-mentioned magnetic resonance signal correction method. The solution provided by this device to solve the problem is similar to the solution described in the above method. Therefore, the specific limitations in one or more embodiments of the following magnetic resonance signal correction device can refer to the limitations on the magnetic resonance signal correction method in the above text, and will not be repeated here.

[0132] In one embodiment, as Figure 3 shown, a magnetic resonance signal correction device is provided, including: an acquisition module 310, a determination module 320, and a correction module 330, where:

[0133] The acquisition module 310 is configured to acquire the original free induction decay signal of the target device;

[0134] The determination module 320 is configured to determine the magnetic resonance signal correction curve of the target device according to the original free induction decay signal;

[0135] The correction module 330 is configured to correct the magnetic resonance signal to be corrected collected by the target device according to the magnetic resonance signal correction curve to obtain the corrected magnetic resonance signal corresponding to the magnetic resonance signal to be corrected.

[0136] In one embodiment, the obtaining module 310 is further configured to determine a first free induction decay signal of the target device when the readout gradient is turned off; and obtain an original free induction decay signal of the target device according to the first free induction decay signal.

[0137] In one embodiment, the determining module 320 is further configured to perform fitting according to the signal amplitude of the original free induction decay signal to obtain a target fitting function of the original free induction decay signal; determine a second free induction decay signal of the target device according to the target fitting function; and obtain a magnetic resonance signal correction curve of the target device according to the second free induction decay signal and the original free induction decay signal.

[0138] In one embodiment, the determining module 320 is further configured to perform non-linear least squares fitting according to the signal amplitude to determine a parameter vector of the target fitting function; and obtain a target fitting function of the original free induction decay signal according to the parameter vector.

[0139] In one embodiment, the parameter vector includes a transverse magnetization vector, a time offset, a relaxation time, and an amplitude offset.

[0140] In one embodiment, the determining module 320 is further configured to obtain a magnetic resonance signal correction curve according to the ratio of the original free induction decay signal to the second free induction decay signal.

[0141] In one embodiment, the correction module 330 is further configured to determine a correction coefficient of the magnetic resonance signal to be corrected according to the magnetic resonance signal correction curve; and correct the magnetic resonance signal to be corrected according to the correction coefficient to obtain a corrected magnetic resonance signal.

[0142] Each module in the above magnetic resonance signal correction device can be implemented in whole or in part by software, hardware, and their combination. Each of the above modules can be embedded in or independent of a processor in a computer device in the form of hardware, or stored in a memory in the computer device in the form of software, so that the processor can call and execute the operations corresponding to the above respective modules.

[0143] In one embodiment, a computer device is provided. The computer device may be a terminal, and its internal structure diagram may be as Figure 4As shown in the figure. The computer device includes a processor, a memory, an input / output interface, a communication interface, a display unit, and an input device. Among them, the processor, the memory, and the input / output interface are connected through a system bus, and the communication interface, the display unit, and the input device are connected to the system bus through the input / output interface. 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 computer programs. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage medium. The input / output interface of the computer device is used to exchange information between the processor and external devices. The communication interface of the computer device is used to communicate with external terminals in a wired or wireless manner, and the wireless manner can be implemented through WIFI, a mobile cellular network, NFC (Near Field Communication), or other technologies. The computer program, when executed by the processor, implements a method for correcting magnetic resonance signals. The display unit of the computer device is used to form a visually visible picture, which can be a display screen, a projection device, or a virtual reality imaging device. The display screen can be a liquid crystal display screen or an electronic ink display screen. The input device of the computer device can be a touch layer covering the display screen, or a button, a trackball, or a touchpad provided on the housing of the computer device, or an external keyboard, touchpad, or mouse, etc.

[0144] Those skilled in the art can understand that Figure 4 the structure shown in the figure is only a block diagram of some structures related to the solution of this application, and does not constitute a limitation on the computer device to which the solution of this application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine some components, or have different component arrangements.

[0145] In one embodiment, a computer device is further provided, including a memory and a processor. A computer program is stored in the memory, and when the processor executes the computer program, the steps in the above method embodiments are implemented.

[0146] 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 the processor, the steps in the above method embodiments are implemented.

[0147] In one embodiment, a computer program product is provided, including a computer program, and when the computer program is executed by the processor, the steps in the above method embodiments are implemented.

[0148] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use, and processing of relevant data need to comply with the relevant laws, regulations, and standards of relevant countries and regions.

[0149] Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be completed by instructing relevant hardware through a computer program. 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 methods. Among them, any reference to a memory, database, or other medium used in the embodiments provided in this application can include at least one of non-volatile and volatile memories. 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. By way of illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc. The databases involved in the embodiments provided in this application can include at least one of relational databases and non-relational databases. Non-relational databases can include distributed databases based on blockchain, etc., and are not limited thereto. The processors involved in the embodiments provided in this application can be general-purpose processors, central processors, graphics processors, digital signal processors, programmable logic devices, data processing logics based on quantum computing, etc., and are not limited thereto.

[0150] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, 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, it should be considered to be within the scope described in this specification.

[0151] The above-described embodiments merely represent several implementation manners of the present application. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the patent scope of the present application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all fall within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the appended claims.

Claims

1. A method for correcting magnetic resonance signals, characterized in that, the method includes: acquiring the original free induction decay signal of the target device; determining the magnetic resonance signal correction curve of the target device according to the original free induction decay signal; correcting the magnetic resonance signal to be corrected collected by the target device according to the magnetic resonance signal correction curve to obtain the corrected magnetic resonance signal corresponding to the magnetic resonance signal to be corrected.

2. The method according to claim 1, characterized in that, the acquiring the original free induction decay signal of the target device includes: determining the first free induction decay signal of the target device when the readout gradient is turned off; obtaining the original free induction decay signal of the target device according to the first free induction decay signal.

3. The method according to claim 2, characterized in that, the determining the magnetic resonance signal correction curve of the target device according to the original free induction decay signal includes: performing fitting according to the signal amplitude of the original free induction decay signal to obtain the target fitting function of the original free induction decay signal; determining the second free induction decay signal of the target device according to the target fitting function; obtaining the magnetic resonance signal correction curve of the target device according to the second free induction decay signal and the original free induction decay signal.

4. The method according to claim 3, characterized in that, the performing fitting according to the signal amplitude of the original free induction decay signal to obtain the target fitting function of the original free induction decay signal includes: performing non-linear least squares fitting according to the signal amplitude to determine the parameter vector of the target fitting function; obtaining the target fitting function of the original free induction decay signal according to the parameter vector.

5. The method according to claim 4, characterized in that, the parameter vector includes the transverse magnetization vector, time offset, relaxation time and amplitude offset.

6. The method according to claim 3, characterized in that, the obtaining the magnetic resonance signal correction curve of the target device according to the second free induction decay signal and the original free induction decay signal includes: obtaining the magnetic resonance signal correction curve according to the ratio of the original free induction decay signal to the second free induction decay signal.

7. The method according to claim 1, characterized in that, the correcting the magnetic resonance signal to be corrected collected by the target device according to the magnetic resonance signal correction curve to obtain the corrected magnetic resonance signal corresponding to the magnetic resonance signal to be corrected includes: determining the correction coefficient of the magnetic resonance signal to be corrected according to the magnetic resonance signal correction curve; correcting the magnetic resonance signal to be corrected according to the correction coefficient to obtain the corrected magnetic resonance signal.

8. A magnetic resonance signal correction device, characterized in that, the device includes: an acquisition module for acquiring the original free induction decay signal of the target device; A determination module, configured to determine a magnetic resonance signal correction curve of the target device according to the original free induction decay signal; A correction module, configured to correct the to-be-corrected magnetic resonance signal collected by the target device according to the magnetic resonance signal correction curve, so as to obtain a corrected magnetic resonance signal corresponding to the to-be-corrected magnetic resonance signal.

9. A magnetic resonance imaging system Characterized in that The system includes: A bed body, configured to carry a target object; A radio frequency transmitting coil, configured to transmit radio frequency pulses to the target object; A gradient coil, configured to generate a gradient field; A radio frequency receiving coil, configured to receive a to-be-corrected magnetic resonance signal; A processor, configured to correct the to-be-corrected magnetic resonance signal according to a pre-determined magnetic resonance signal correction curve, so as to obtain a corrected magnetic resonance signal; the magnetic resonance signal correction curve is determined according to the original free induction decay signal of the magnetic resonance imaging system.

10. A computer device, including a memory and a processor, where the memory stores a computer program Characterized in that When the processor executes the computer program, the steps of the method according to any one of claims 1 to 7 are implemented.

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