Magnetic resonance longitudinal relaxation time determination method and system

Abstract

The invention relates to a magnetic resonance longitudinal relaxation time measuring method and system. The method comprises the following steps: acquiring minimum magnetic resonance signal values and other magnetic resonance signal values at each pixel position in magnetic resonance images at a plurality of acquisition moments; fitting the minimum magnetic resonance signal value at each pixel position and other magnetic resonance signal values to obtain a first fitting result of each pixel position; and fitting the opposite number of the minimum magnetic resonance signal value at each pixel position and other magnetic resonance signal values to obtain a second fitting result of each pixel position, and determining a magnetic resonance longitudinal relaxation time measurement result according to the first fitting result and the second fitting result of each pixel position. By adopting the method, the measurement result of the magnetic resonance longitudinal relaxation time can be accurately obtained.

Description

Technical Field

[0001] The present application relates to the field of magnetic resonance scanning technology, and in particular to a method and system for measuring magnetic resonance longitudinal relaxation time. Background Art

[0002] During magnetic resonance imaging, the proton relaxation time has an important influence on image quality and signal intensity. The relaxation time is divided into longitudinal relaxation time and transverse relaxation time.

[0003] Taking the measurement process of longitudinal relaxation time as an example, in the related technology, the longitudinal magnetization vector is flipped by applying an inversion recovery pulse, and then the magnetic resonance imaging sequence is used to collect magnetic resonance data at different times. Part of the magnetic resonance data is inverted, and the inverted magnetic resonance data is fitted to obtain the measurement result of the longitudinal relaxation time.

[0004] However, the method of the related art has the problem that the measurement result of the magnetic resonance longitudinal relaxation time is inaccurate. Summary of the invention

[0005] Based on this, it is necessary to provide a method and system for measuring magnetic resonance longitudinal relaxation time in order to solve the above technical problems, so as to accurately obtain the measurement results of magnetic resonance longitudinal relaxation time.

[0006] In a first aspect, the present application provides a method for measuring magnetic resonance longitudinal relaxation time, comprising:

[0007] Acquire the minimum magnetic resonance signal value and other magnetic resonance signal values ​​at each pixel position in the magnetic resonance images at multiple acquisition moments;

[0008] Fitting the minimum magnetic resonance signal value and other magnetic resonance signal values ​​at each pixel position to obtain a first fitting result at each pixel position; and fitting the inverse of the minimum magnetic resonance signal value and other magnetic resonance signal values ​​at each pixel position to obtain a second fitting result at each pixel position;

[0009] The magnetic resonance longitudinal relaxation time measurement result is determined according to the first fitting result and the second fitting result at each pixel position.

[0010] In one embodiment, determining the magnetic resonance longitudinal relaxation time measurement result according to the first fitting result and the second fitting result at each pixel position includes:

[0011] Determine the longitudinal relaxation time of each pixel position according to the first fitting result and the second fitting result of each pixel position;

[0012] The combined result of the longitudinal relaxation time at all pixel positions is taken as the magnetic resonance longitudinal relaxation time measurement result.

[0013] In one embodiment, determining the longitudinal relaxation time of each pixel position according to the first fitting result and the second fitting result of each pixel position includes:

[0014] For any pixel position, obtaining a first fitting evaluation result corresponding to the first fitting result of the pixel position, and obtaining a second fitting evaluation result corresponding to the second fitting result of the pixel position;

[0015] The longitudinal relaxation time of the pixel position is determined according to the first fitting evaluation result and the second fitting evaluation result.

[0016] In one embodiment, the first fitting result is a first fitting curve;

[0017] Obtaining a first fitting evaluation result corresponding to the first fitting result at the pixel position includes:

[0018] Acquire a vertical distance between a magnetic resonance signal value at a pixel position on each magnetic resonance image and a first fitting curve;

[0019] Based on the average value of each vertical distance, a first fitting evaluation result corresponding to the first fitting result is determined.

[0020] In one embodiment, determining the longitudinal relaxation time of the pixel position according to the first fitting evaluation result and the second fitting evaluation result includes:

[0021] comparing the first fitting evaluation result and the second fitting evaluation result;

[0022] If the first fitting evaluation result is greater than the second fitting evaluation result, the longitudinal relaxation time corresponding to the first fitting result is used as the longitudinal relaxation time of the pixel position;

[0023] If the first fitting evaluation result is less than the second fitting evaluation result, the longitudinal relaxation time corresponding to the second fitting result is used as the longitudinal relaxation time of the pixel position;

[0024] If the first fitting evaluation result is equal to the second fitting evaluation result, the longitudinal relaxation time corresponding to the first fitting result or the second fitting result is used as the longitudinal relaxation time of the pixel position.

[0025] In one embodiment, obtaining the minimum magnetic resonance signal value and other magnetic resonance signal values ​​at each pixel position in the magnetic resonance images at multiple acquisition moments includes:

[0026] Acquiring magnetic resonance images at multiple acquisition times after applying an inversion recovery pulse;

[0027] Analyze the magnetic resonance signal values ​​of each pixel position in the magnetic resonance image at multiple acquisition moments, screen out the minimum magnetic resonance signal value of each pixel position from each pixel position; and use the magnetic resonance signal values ​​other than the minimum magnetic resonance signal value as other magnetic resonance signal values.

[0028] In a second aspect, the present application also provides a magnetic resonance longitudinal relaxation time determination system, the magnetic resonance longitudinal relaxation time determination system comprising a magnetic resonance device and a computer device;

[0029] A magnetic resonance device for acquiring magnetic resonance images at a plurality of acquisition moments while applying an inversion recovery pulse to a region of interest of an acquisition object;

[0030] The computer device is used to fit the minimum magnetic resonance signal value and other magnetic resonance signal values ​​at each pixel position in the magnetic resonance images at multiple acquisition moments to obtain a first fitting result at each pixel position; and to fit the inverse of the minimum magnetic resonance signal value and other magnetic resonance signal values ​​at each pixel position to obtain a second fitting result at each pixel position, and determine the magnetic resonance longitudinal relaxation time measurement result based on the first fitting result and the second fitting result at each pixel position.

[0031] In a third aspect, the present application also provides a magnetic resonance longitudinal relaxation time measuring device, comprising:

[0032] An acquisition module, used for acquiring the minimum magnetic resonance signal value and other magnetic resonance signal values ​​at each pixel position in the magnetic resonance image at multiple acquisition moments;

[0033] A fitting module is used to fit the minimum magnetic resonance signal value and other magnetic resonance signal values ​​at each pixel position to obtain a first fitting result at each pixel position; and to fit the opposite of the minimum magnetic resonance signal value and other magnetic resonance signal values ​​at each pixel position to obtain a second fitting result at each pixel position;

[0034] The determination module is used to determine the magnetic resonance longitudinal relaxation time measurement result according to the first fitting result and the second fitting result of each pixel position.

[0035] In a fourth aspect, the present application further provides a computer device, comprising a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the content of any one embodiment of the method for measuring magnetic resonance longitudinal relaxation time in the first aspect is implemented.

[0036] In a fifth aspect, the present application further provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the content of any one embodiment of the method for measuring magnetic resonance longitudinal relaxation time in the first aspect.

[0037] In a sixth aspect, the present application further provides a computer program product, comprising a computer program, which, when executed by a processor, implements the content of any one embodiment of the method for measuring magnetic resonance longitudinal relaxation time in the first aspect.

[0038] The above-mentioned magnetic resonance longitudinal relaxation time determination method and system obtain the minimum magnetic resonance signal value and other magnetic resonance signal values ​​at each pixel position in the magnetic resonance images at multiple acquisition moments; fit the minimum magnetic resonance signal value and other magnetic resonance signal values ​​at each pixel position to obtain the first fitting result at each pixel position; and fit the opposite number of the minimum magnetic resonance signal value and other magnetic resonance signal values ​​at each pixel position to obtain the second fitting result at each pixel position; and determine the magnetic resonance longitudinal relaxation time determination result according to the first fitting result and the second fitting result at each pixel position. The method starts from the pixel positions of the magnetic resonance images at multiple acquisition moments, takes the magnetic resonance signal values ​​closest to zero as positive values ​​and negative values ​​respectively during the fitting process, and then performs longitudinal relaxation time fitting, and according to the positive value fitting result and the negative value fitting result, the fitting result of each pixel position can be accurately obtained, so that the magnetic resonance longitudinal relaxation time determination result can be accurately determined. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the drawings required for use in the embodiments of the present application or related technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0040] Figure 1 is a schematic diagram of a magnetic resonance signal curve actually collected in one embodiment;

[0041] Figure 2 A diagram showing an application environment of a method for measuring magnetic resonance longitudinal relaxation time in one embodiment;

[0042] Figure 3 Schematic diagram of a method for measuring magnetic resonance longitudinal relaxation time in one embodiment;

[0043] Figure 4 is a schematic diagram of a theoretical recovery curve of a magnetic resonance signal after an inversion recovery pulse in one embodiment;

[0044] Figure 5 Schematic diagram of a method for measuring magnetic resonance longitudinal relaxation time in one embodiment;

[0045] Figure 6Schematic diagram of a method for measuring magnetic resonance longitudinal relaxation time in one embodiment;

[0046] Figure 7 Schematic diagram of a method for measuring magnetic resonance longitudinal relaxation time in one embodiment;

[0047] Figure 8 Schematic diagram of a method for measuring magnetic resonance longitudinal relaxation time in one embodiment;

[0048] Fig. 9 Schematic diagram of a method for measuring magnetic resonance longitudinal relaxation time in one embodiment;

[0049] Fig.10 Schematic diagram of a method for measuring magnetic resonance longitudinal relaxation time in one embodiment;

[0050] Fig.11 is a structural block diagram of a magnetic resonance longitudinal relaxation time measuring device in one embodiment;

[0051] Fig.12 FIG. 4 is a diagram showing the internal structure of a computer device in one embodiment. DETAILED DESCRIPTION

[0052] 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.

[0053] Before introducing the technical solution of the present application in detail, a brief introduction to the technical background of the present application is first given.

[0054] Taking the determination process of longitudinal relaxation time as an example, in the related art, the longitudinal magnetization vector is mainly flipped by applying an inversion recovery pulse, and then the images with different inversion recovery times are acquired by using a magnetic resonance imaging sequence at different times. Since the signal intensity after different inversion recovery times satisfies the exponential change, the images with different inversion recovery times are exponentially fitted to obtain the longitudinal relaxation time. The longitudinal relaxation time constant fitted by this method is more accurate, especially the inversion recovery spin echo sequence method is often used as the gold standard method in the quantitative longitudinal relaxation time of magnetic resonance applications. In theory, since the longitudinal magnetization vector is reversed to the negative direction after applying the inversion recovery sequence, the recovery of the magnetic resonance signal is a process of gradually recovering from the negative value to the positive steady-state value. However, the images reconstructed by the conventional magnetic resonance imaging sequence are often positive in amplitude diagram, so it is necessary to first negate a part of the magnetic resonance signal value and then fit it. This results in the magnetic resonance signal value close to zero being unable to determine whether it is positive or negative. The incorrect processing of the magnetic resonance signal value at this point will cause errors in the fitted longitudinal relaxation time. Of course, it is also possible to reconstruct a phase diagram from the collected data and then determine the sign of the magnetic resonance signal value near the zero point. However, factors such as magnetic field unevenness and movement may cause the phase diagram to be inaccurate, and it is impossible to accurately identify the sign of the magnetic resonance signal value near the zero point.

[0055] For example, Figure 1 This is a schematic diagram of the magnetic resonance signal curve actually collected. The curve in this figure is an amplitude diagram of the image reconstructed by the magnetic resonance imaging sequence, which is often only positive values. It can be seen from the figure that the first half gradually decreases from +M to 0, and then gradually increases from 0 to +M according to the exponential function curve. The part of the curve that gradually decreases from +M to 0 is the part where the magnetic resonance signal value needs to be inverted.

[0056] In view of the above problems, the present application provides a method and system for measuring the longitudinal relaxation time of magnetic resonance. For the longitudinal magnetization vector flipped by inversion recovery pulse, and then the amplitude image collected by magnetic resonance imaging sequence at different times, the amplitude map can be used to fit the longitudinal relaxation time constant. In the fitting process, the magnetic resonance signal value closest to zero is taken as positive and negative values, respectively, and then the longitudinal relaxation time is fitted, and the fitting value with high fitting goodness is selected as the final fitting result to improve the accuracy of the fitting longitudinal relaxation time. Of course, the technical solution provided in the embodiment of the present application is not limited to solving the above problems, and there are other technical effects, which can be specifically referred to in the following embodiment description. Next, the technical solution of the present application is introduced in detail.

[0057] The magnetic resonance longitudinal relaxation time determination method provided in the embodiment of the present application can be applied to Figure 2In the application environment shown. The application environment includes a computer device 101 and a magnetic resonance device 102, and the computer device 101 and the magnetic resonance device 102 communicate with each other. The magnetic resonance device 102 is used to acquire magnetic resonance images at multiple acquisition times when an inversion recovery pulse is applied to a region of interest of an acquisition object. The computer device 101 is used to obtain the minimum magnetic resonance signal value and other magnetic resonance signal values ​​at each pixel position in the magnetic resonance images at multiple acquisition times; fit the minimum magnetic resonance signal value and other magnetic resonance signal values ​​at each pixel position to obtain a first fitting result at each pixel position; and fit the opposite number of the minimum magnetic resonance signal value and other magnetic resonance signal values ​​at each pixel position to obtain a second fitting result at each pixel position; determine the magnetic resonance longitudinal relaxation time measurement result according to the first fitting result and the second fitting result at each pixel position.

[0058] In an exemplary embodiment, Figure 3 As shown, a method for determining magnetic resonance longitudinal relaxation time is provided, and the method is applied to Figure 2 The computer device in the example is used to illustrate, including the following steps 101 to 103. Among them:

[0059] S101, obtaining the minimum magnetic resonance signal value and other magnetic resonance signal values ​​at each pixel position in the magnetic resonance images at multiple acquisition moments.

[0060] The multiple acquisition moments refer to multiple moments after the magnetic resonance device applies an inversion recovery pulse to the region of interest of the acquisition object. For example, the multiple acquisition moments may be the 1st second, 3rd second, 5th second, etc. after the inversion recovery pulse is applied.

[0061] In an embodiment of the present application, the computer device may send a magnetic resonance longitudinal relaxation time measurement instruction generated based on user needs to the magnetic resonance device based on user needs. The magnetic resonance longitudinal relaxation time measurement instruction carries a magnetic resonance image acquisition instruction at multiple times after applying an inversion recovery pulse. Then, after the magnetic resonance device applies an inversion recovery pulse to the region of interest of the acquisition object, the magnetic resonance device may acquire magnetic resonance images of the region of interest of the acquisition object at a preset time interval or in real time, and send the acquired magnetic resonance images at multiple times to the computer device. Optionally, the magnetic resonance images at multiple acquisition times acquired by the magnetic resonance device after applying the inversion recovery pulse are stored in the image memory of the magnetic resonance device. The computer device may send an image acquisition instruction to the magnetic resonance device, and when the magnetic resonance device receives the image acquisition instruction, it sends the magnetic resonance images at multiple acquisition times in the image memory that match the image acquisition instruction to the computer device.

[0062] Further, when magnetic resonance images at multiple acquisition moments are acquired, each pixel position refers to a position corresponding to each magnetic resonance image. For example, assuming that the number of acquisition moments is 5 and the magnetic resonance images are A, B, C, D and E, respectively, then the pixel position may be the first pixel point in the magnetic resonance images A, B, C, D and E.

[0063] For any pixel position, the computer device can obtain the magnetic resonance signal value of the pixel position on each magnetic resonance image, and screen the magnetic resonance signal values ​​to determine the minimum magnetic resonance signal value from multiple magnetic resonance signal values. And, the magnetic resonance signal values ​​other than the minimum magnetic resonance signal value are all used as other magnetic resonance signal values.

[0064] Exemplarily, the number of acquisition moments is N, and the size of the magnetic resonance image can be (Nx, Ny). The magnetic resonance signal value of the i,j-th pixel point (one pixel position) in the k-th magnetic resonance image is Imk(i,j), where 1≤i≤Nx, 1≤j≤Ny. That is, the minimum magnetic resonance signal value Imh(i,j) is found from Im1(i,j)-ImN(i,j), and the order of the magnetic resonance image corresponding to the minimum magnetic resonance signal value is h.

[0065] S102, fitting the minimum magnetic resonance signal value and other magnetic resonance signal values ​​at each pixel position to obtain a first fitting result at each pixel position; and fitting the inverse of the minimum magnetic resonance signal value and other magnetic resonance signal values ​​at each pixel position to obtain a second fitting result at each pixel position.

[0066] In the embodiment of the present application, when the magnetic resonance device applies an inversion recovery pulse to the region of interest of the acquisition object, the magnetic resonance signal changes from +M to -M, and then recovers until it returns to the equilibrium state of +M and remains unchanged. This recovery process satisfies an exponential function, which can be expressed as:

[0067]

[0068] in, represents the intensity of the longitudinal magnetization vector at the tth moment after the inversion recovery pulse is applied; T1 represents the longitudinal relaxation time; M is the intensity of the longitudinal magnetization vector in the equilibrium state.

[0069] Figure 4It is a schematic diagram of the theoretical recovery curve of the magnetic resonance signal after an inversion recovery pulse. After each application of the inversion recovery pulse, the magnetic resonance signal value can be measured using a magnetic resonance imaging sequence at different acquisition times. In order to fit the recovery process of the magnetic resonance signal, it is necessary to take the negative value of the corresponding magnetic resonance signal value before fitting and then perform calculations. However, the magnetic resonance signal value close to zero cannot be determined whether it is positive or negative, and the incorrect processing of the magnetic resonance signal value at this point will cause an error in the longitudinal relaxation time constant obtained by fitting.

[0070] In the embodiment of the present application, in combination with Figure 1 looking, the magnetic resonance signal value whose positive or negative cannot be determined refers to the minimum value of the actually acquired magnetic resonance signal curve. Therefore, after the computer device obtains the minimum magnetic resonance signal value at each pixel position, it can perform fitting by taking the positive value or negative value of the minimum magnetic resonance signal value respectively. Specifically, for any pixel position, the computer device can use the exponential function fitting method to fit the minimum magnetic resonance signal value and other magnetic resonance signal values at this pixel position to obtain the first fitting result. The first fitting result here is the exponential function curve corresponding to the positive value. At the same time, the computer device can also use the exponential function fitting method to fit the opposite number of the minimum magnetic resonance signal value at this pixel position and other magnetic resonance signal values to obtain the second fitting result. The second fitting result here is the exponential function curve corresponding to the negative value.

[0071] Exemplarily, the opposite number of the minimum magnetic resonance signal value is Imm(i,j)=-Imm(i,j), m<h, and the minimum magnetic resonance signal value takes the positive value or negative value respectively, that is, Imh(i,j)=-Imh(i,j) or Imh(i,j)=Imh(i,j). Based on T1 and Im(i,j), the least squares fitting of the target formula is performed to obtain the first fitting result and the second fitting result. Among them, the target formula can be expressed as: . The longitudinal relaxation time corresponding to the first fitting result is expressed as T1 + (i,j), and the longitudinal relaxation time corresponding to the second fitting result is expressed as T1 - (i,j).

[0072] S103. Determine the measurement result of the magnetic resonance longitudinal relaxation time according to the first fitting result and the second fitting result of each pixel position.

[0073] In an embodiment of the present application, the magnetic resonance longitudinal relaxation time measurement result is determined by the longitudinal relaxation time measurement result at each pixel position. Therefore, for any pixel position, the computer device can evaluate the first fitting result and the second fitting result of the pixel position respectively according to the preset evaluation rules, and use the fitting result with a better evaluation result as the longitudinal relaxation time measurement result of the pixel position. Alternatively, the computer device can also compare the first fitting result and the second fitting result, and use the fitting result with a better effect as the longitudinal relaxation time measurement result of the pixel position. Then combine the longitudinal relaxation time measurement results of multiple pixel positions, and use the combined result as the magnetic resonance longitudinal relaxation time measurement result.

[0074] In the above-mentioned magnetic resonance longitudinal relaxation time determination method, the minimum magnetic resonance signal value and other magnetic resonance signal values ​​at each pixel position in the magnetic resonance images at multiple acquisition moments are obtained; the minimum magnetic resonance signal value and other magnetic resonance signal values ​​at each pixel position are fitted to obtain a first fitting result at each pixel position; and the opposite number of the minimum magnetic resonance signal value and other magnetic resonance signal values ​​at each pixel position are fitted to obtain a second fitting result at each pixel position; and the magnetic resonance longitudinal relaxation time determination result is determined based on the first fitting result and the second fitting result at each pixel position. The method starts from the pixel positions of the magnetic resonance images at multiple acquisition moments, and in the fitting process, the magnetic resonance signal values ​​closest to zero are respectively taken as positive values ​​and negative values, and then the longitudinal relaxation time is fitted, and based on the positive value fitting result and the negative value fitting result, the fitting result of each pixel position can be accurately obtained, so that the magnetic resonance longitudinal relaxation time determination result can be accurately determined.

[0075] Next, the specific content of determining the magnetic resonance longitudinal relaxation time measurement result according to the first fitting result and the second fitting result of each pixel position is introduced through an embodiment. Figure 5 As shown, the specific content includes the following steps:

[0076] S201, determining the longitudinal relaxation time of each pixel position according to the first fitting result and the second fitting result of each pixel position.

[0077] In an embodiment of the present application, for any pixel position, the computer device can use a preset evaluation rule to evaluate the first fitting result and the second fitting result respectively, and filter out the fitting result with a higher evaluation from the two evaluation results. The longitudinal relaxation time corresponding to the fitting result with a higher evaluation is used as the longitudinal relaxation time of the pixel position. Alternatively, the computer device can also obtain the degree of discreteness of the sampling point and the fitting curve on the first fitting result of the pixel position and the degree of discreteness of the sampling point and the fitting curve on the second fitting result, and use the longitudinal relaxation time corresponding to the fitting result with a lower degree of discreteness as the longitudinal relaxation time of the pixel position.

[0078] S202, combining the longitudinal relaxation times of all pixel positions as the magnetic resonance longitudinal relaxation time measurement result.

[0079] In the embodiment of the present application, after the longitudinal relaxation time of each pixel position is obtained, the computer device can sort the longitudinal relaxation times of all pixel positions according to the position of each pixel in the magnetic resonance image, and combine the sorted multiple longitudinal relaxation times to obtain a combined result as the magnetic resonance longitudinal relaxation time measurement result.

[0080] In the above-mentioned magnetic resonance longitudinal relaxation time determination method, the longitudinal relaxation time of each pixel position is determined according to the first fitting result and the second fitting result of each pixel position; the combined result of the longitudinal relaxation time of all pixel positions is used as the magnetic resonance longitudinal relaxation time determination result. Starting from the pixel perspective, the method accurately determines the longitudinal relaxation time of each pixel position by analyzing the first fitting result and the second fitting result of each pixel position, thereby accurately determining the magnetic resonance longitudinal relaxation time determination result on the entire magnetic resonance image.

[0081] In one embodiment, Figure 6 As shown, the specific content of determining the longitudinal relaxation time of each pixel position according to the first fitting result and the second fitting result of each pixel position is introduced, and the specific content includes the following steps:

[0082] S301, for any pixel position, obtaining a first fitting evaluation result corresponding to a first fitting result of the pixel position, and obtaining a second fitting evaluation result corresponding to a second fitting result of the pixel position.

[0083] The fitting evaluation result is an evaluation of the accuracy of the fitting result. Specifically, it represents the degree of discreteness between each pixel point and the fitting curve.

[0084] In the embodiment of the present application, for any pixel position, the computer device can evaluate the first fitting result according to a preset evaluation rule to obtain a first fitting evaluation result corresponding to the first fitting result. At the same time, the computer device can also evaluate the second fitting result according to the evaluation rule to obtain a second fitting evaluation result corresponding to the second fitting result.

[0085] Alternatively, the computer device may also use the evaluation model to evaluate the first fitting result and the second fitting result respectively, to obtain a first fitting evaluation result corresponding to the first fitting result and a second fitting evaluation result corresponding to the second fitting result. The first fitting evaluation result corresponding to the first fitting result can be expressed as R + 2 (i, j), the second fitting evaluation result corresponding to the second fitting result can be expressed as R - 2 S302: Determine the longitudinal relaxation time of the pixel position according to the first fitting evaluation result and the second fitting evaluation result.

[0086] In an embodiment of the present application, after obtaining the first fitting evaluation result and the second fitting evaluation result, the computer device can filter out the fitting evaluation result with a higher evaluation from the two fitting evaluation results, and determine the longitudinal relaxation time of the pixel position based on the fitting evaluation result with a higher evaluation.

[0087] In the magnetic resonance longitudinal relaxation time determination method, for any pixel position, a first fitting evaluation result corresponding to the first fitting result of the pixel position is obtained, and a second fitting evaluation result corresponding to the second fitting result of the pixel position is obtained; the longitudinal relaxation time of the pixel position is determined according to the first fitting evaluation result and the second fitting evaluation result. For any pixel position, the method can more objectively analyze the two fitting results by evaluating the two fitting results respectively and based on the evaluation results of the two fitting results, so that the longitudinal relaxation time at the pixel position can be accurately determined.

[0088] Assuming that the first fitting result is a first fitting curve, then, in one embodiment, if Figure 7 As shown, the specific content of the first fitting evaluation result corresponding to the first fitting result of the pixel position obtained above includes:

[0089] S401, obtaining a vertical distance between a magnetic resonance signal value at a pixel position on each magnetic resonance image and a first fitting curve.

[0090] In the embodiment of the present application, the first fitting curve is obtained by fitting the multiple magnetic resonance signal values ​​corresponding to the pixel position, so a part of the multiple magnetic resonance signal values ​​may be on the first fitting curve, and another part may be distributed around the first fitting curve. Based on this, the computer device can calculate the multiple theoretical magnetic resonance signal values ​​at the pixel position based on the first fitting curve. And calculate the error between each magnetic resonance signal value and the corresponding theoretical magnetic resonance signal value, and use the error as the vertical distance between the magnetic resonance signal value on each magnetic resonance image and the first fitting curve.

[0091] S402: Determine a first fitting evaluation result corresponding to the first fitting result based on an average value of each vertical distance.

[0092] In the embodiment of the present application, after obtaining the vertical distance between the magnetic resonance signal value on each magnetic resonance image and the first fitting curve, the computer device can calculate the average value of multiple vertical distances. The average value of multiple vertical distances indicates the degree of discreteness between the signal value and the fitting curve. Then, the computer device can map the average value of each vertical distance according to the mapping relationship between the vertical distance average value and the evaluation value to obtain the first fitting evaluation result corresponding to the first fitting result.

[0093] In the above-mentioned method for determining the magnetic resonance longitudinal relaxation time, the vertical distance between the magnetic resonance signal value at the pixel position on each magnetic resonance image and the first fitting curve is obtained; based on the average value of each vertical distance, the first fitting evaluation result corresponding to the first fitting result is determined. By obtaining the vertical distance between each magnetic resonance signal value and the first fitting curve and calculating the average value of multiple vertical distances, the method can accurately determine the degree of discreteness of multiple magnetic resonance signal values, thereby accurately evaluating the first fitting result and obtaining a more accurate first fitting evaluation result.

[0094] Similarly, the second fitting evaluation result corresponding to the second fitting result of the pixel position can also be obtained in the above manner. Specifically, the vertical distance between the magnetic resonance signal value of the pixel position on each magnetic resonance image and the second fitting curve is obtained; based on the average value of each vertical distance, the second fitting evaluation result corresponding to the second fitting result is determined.

[0095] Next, a specific method for determining the longitudinal relaxation time of a pixel position according to the first fitting evaluation result and the second fitting evaluation result is introduced through an embodiment. Figure 8 As shown, the specific content includes the following steps:

[0096] S501, comparing the first fitting evaluation result and the second fitting evaluation result.

[0097] In the embodiment of the present application, after obtaining the first fitting evaluation result corresponding to the first fitting result and the second fitting evaluation result corresponding to the second fitting result, since the first fitting evaluation result and the second fitting evaluation result are both evaluation values ​​of the fitting results, the higher the evaluation value, the better the evaluation result. For example, if the first fitting evaluation result is 0.98 and the second fitting evaluation result is 0.8, then, in comparison, the first fitting evaluation result is greater than the second fitting evaluation result.

[0098] S502: If the first fitting evaluation result is greater than the second fitting evaluation result, the longitudinal relaxation time corresponding to the first fitting result is used as the longitudinal relaxation time of the pixel position.

[0099] In an embodiment of the present application, if the comparison result is that the first fitting evaluation result is greater than the second fitting evaluation result, it means that the first fitting evaluation result is closer to 1, that is, the first fitting result is more accurate. Then, the computer device can obtain the longitudinal relaxation time corresponding to the first fitting result and use the longitudinal relaxation time as the longitudinal relaxation time of the pixel position.

[0100] S503: If the first fitting evaluation result is smaller than the second fitting evaluation result, the longitudinal relaxation time corresponding to the second fitting result is used as the longitudinal relaxation time of the pixel position.

[0101] In an embodiment of the present application, if the comparison result is that the first fitting evaluation result is less than the second fitting evaluation result, it means that the second fitting evaluation result is closer to 1, that is, the second fitting result is more accurate. Then, the computer device can obtain the longitudinal relaxation time corresponding to the second fitting result and use the longitudinal relaxation time as the longitudinal relaxation time of the pixel position.

[0102] S504: If the first fitting evaluation result is equal to the second fitting evaluation result, the longitudinal relaxation time corresponding to the first fitting result or the second fitting result is used as the longitudinal relaxation time of the pixel position.

[0103] In an embodiment of the present application, if the comparison result is that the first fitting evaluation result is equal to the second fitting evaluation result, indicating that the first fitting evaluation result is the same as the second fitting evaluation result, then the computer device can obtain the longitudinal relaxation time corresponding to the first fitting result or the second fitting result, and use the longitudinal relaxation time as the longitudinal relaxation time of the pixel position.

[0104] In the above magnetic resonance longitudinal relaxation time determination method, the first fitting evaluation result and the second fitting evaluation result are compared; if the first fitting evaluation result is greater than the second fitting evaluation result, the longitudinal relaxation time corresponding to the first fitting result is used as the longitudinal relaxation time of the pixel position; if the first fitting evaluation result is less than the second fitting evaluation result, the longitudinal relaxation time corresponding to the second fitting result is used as the longitudinal relaxation time of the pixel position; if the first fitting evaluation result is equal to the second fitting evaluation result, the longitudinal relaxation time corresponding to the first fitting result or the second fitting result is used as the longitudinal relaxation time of the pixel position. By comparing the first fitting evaluation result and the second fitting evaluation result, the method can accurately screen out a more accurate longitudinal relaxation time from the first fitting result and the second fitting result based on different comparison results, thereby improving the accuracy of the longitudinal relaxation time of each pixel position.

[0105] The above embodiments are all about describing the specific process of determining the magnetic resonance longitudinal relaxation time measurement result according to the first fitting result and the second fitting result of each pixel position. Next, the process of obtaining the minimum magnetic resonance signal value is described in detail. In one embodiment, Fig. 9 As shown, the specific contents of the minimum magnetic resonance signal value and other magnetic resonance signal values ​​at each pixel position in the magnetic resonance images acquired at multiple acquisition moments include:

[0106] S601, acquiring magnetic resonance images at multiple acquisition times after applying an inversion recovery pulse.

[0107] In an embodiment of the present application, the computer device can control the magnetic resonance device to collect magnetic resonance signals at multiple collection times after applying the inversion recovery pulse. The computer device can also search for magnetic resonance signals at multiple collection times after applying the inversion recovery pulse from a signal database. After acquiring the magnetic resonance signals at multiple collection times, the computer device can reconstruct the image of the magnetic resonance signal at each collection time to obtain magnetic resonance images at multiple collection times.

[0108] S602, analyzing the magnetic resonance signal values ​​of each pixel position in the magnetic resonance images at multiple acquisition moments, screening out the minimum magnetic resonance signal value of each pixel position from each pixel position; and taking the magnetic resonance signal values ​​other than the minimum magnetic resonance signal value as other magnetic resonance signal values.

[0109] In the embodiment of the present application, since the magnetic resonance images at multiple acquisition moments are all images of the region of interest of the acquisition object, the same pixel position of each magnetic resonance image represents a fixed position on the region of interest. Therefore, for any pixel position, the computer device can obtain the magnetic resonance signal value of the pixel position in each magnetic resonance image, and filter out the minimum magnetic resonance signal value from the multiple magnetic resonance signal values. And the magnetic resonance signal values ​​other than the minimum magnetic resonance signal value are all used as other magnetic resonance signal values.

[0110] In the above-mentioned magnetic resonance longitudinal relaxation time determination method, magnetic resonance images at multiple acquisition times after applying an inversion recovery pulse are obtained; the magnetic resonance signal values ​​of each pixel position in the magnetic resonance images at multiple acquisition times are analyzed, and the minimum magnetic resonance signal value of each pixel position is screened out from each pixel position; and the magnetic resonance signal values ​​other than the minimum magnetic resonance signal value are used as other magnetic resonance signal values. By comparing multiple magnetic resonance signal values ​​at each pixel position of the magnetic resonance images at multiple acquisition times, the method can accurately screen out the minimum magnetic resonance signal value and other magnetic resonance signal values ​​from multiple magnetic resonance signal values, which is convenient for the subsequent fitting process.

[0111] As a specific embodiment of the present application, the magnetic resonance longitudinal relaxation time determination process is described in detail below. In one embodiment, Fig.10 As shown, the magnetic resonance longitudinal relaxation time determination method comprises:

[0112] S701, acquiring magnetic resonance images at multiple acquisition times after applying an inversion recovery pulse;

[0113] S702, analyzing the magnetic resonance signal values ​​of each pixel position in the magnetic resonance images at multiple acquisition moments, screening out the minimum magnetic resonance signal value of each pixel position from each pixel position; and using the magnetic resonance signal values ​​other than the minimum magnetic resonance signal value as other magnetic resonance signal values;

[0114] S703, fitting the minimum magnetic resonance signal value and other magnetic resonance signal values ​​at each pixel position to obtain a first fitting result at each pixel position; and fitting the inverse of the minimum magnetic resonance signal value and other magnetic resonance signal values ​​at each pixel position to obtain a second fitting result at each pixel position;

[0115] S704, for any pixel position, obtaining a first fitting evaluation result corresponding to the first fitting result of the pixel position, and obtaining a second fitting evaluation result corresponding to the second fitting result of the pixel position;

[0116] S705, comparing the first fitting evaluation result and the second fitting evaluation result;

[0117] S706, if the first fitting evaluation result is greater than the second fitting evaluation result, taking the longitudinal relaxation time corresponding to the first fitting result as the longitudinal relaxation time of the pixel position;

[0118] S707, if the first fitting evaluation result is less than the second fitting evaluation result, taking the longitudinal relaxation time corresponding to the second fitting result as the longitudinal relaxation time of the pixel position;

[0119] S708, if the first fitting evaluation result is equal to the second fitting evaluation result, taking the longitudinal relaxation time corresponding to the first fitting result or the second fitting result as the longitudinal relaxation time of the pixel position;

[0120] S709: Taking the combined result of the longitudinal relaxation time at all pixel positions as the magnetic resonance longitudinal relaxation time measurement result.

[0121] It should be understood that, although the steps in the flowcharts involved in the above 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 is not strictly limited in order, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above embodiments may 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 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.

[0122] In one embodiment, a magnetic resonance longitudinal relaxation time determination system is also provided, the magnetic resonance longitudinal relaxation time determination system comprising a magnetic resonance device and a computer device;

[0123] A magnetic resonance device for acquiring magnetic resonance images at a plurality of acquisition moments while applying an inversion recovery pulse to a region of interest of an acquisition object;

[0124] The computer device is used to fit the minimum magnetic resonance signal value and other magnetic resonance signal values ​​at each pixel position in the magnetic resonance images at multiple acquisition moments to obtain a first fitting result at each pixel position; and to fit the inverse of the minimum magnetic resonance signal value and other magnetic resonance signal values ​​at each pixel position to obtain a second fitting result at each pixel position, and determine the magnetic resonance longitudinal relaxation time measurement result based on the first fitting result and the second fitting result at each pixel position.

[0125] The magnetic resonance longitudinal relaxation time determination system includes a magnetic resonance device and a computer device; the magnetic resonance device is used to collect magnetic resonance images at multiple acquisition times under the condition that an inversion recovery pulse is applied to the region of interest of the acquisition object; the computer device is used to fit the minimum magnetic resonance signal value and other magnetic resonance signal values ​​at each pixel position in the magnetic resonance images at multiple acquisition times to obtain a first fitting result at each pixel position; and, fit the opposite number of the minimum magnetic resonance signal value and other magnetic resonance signal values ​​at each pixel position to obtain a second fitting result at each pixel position, and determine the magnetic resonance longitudinal relaxation time determination result according to the first fitting result and the second fitting result at each pixel position. The system starts from the pixel positions of the magnetic resonance images at multiple acquisition times, takes the data closest to zero as positive and negative values ​​respectively during the fitting process, and then performs longitudinal relaxation time fitting, and can accurately obtain the fitting result of each pixel position according to the positive value fitting result and the negative value fitting result, so as to accurately determine the magnetic resonance longitudinal relaxation time determination result.

[0126] Based on the same inventive concept, the embodiment of the present application also provides a magnetic resonance longitudinal relaxation time measuring device for implementing the magnetic resonance longitudinal relaxation time measuring method involved above. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above method, so the specific limitations of one or more magnetic resonance longitudinal relaxation time measuring device embodiments provided below can refer to the limitations of the magnetic resonance longitudinal relaxation time measuring method above, and will not be repeated here.

[0127] In an exemplary embodiment, Fig.11 As shown, a magnetic resonance longitudinal relaxation time measuring device is provided, comprising: an acquisition module 11, a fitting module 12 and a determination module 13, wherein:

[0128] An acquisition module 11 is used to acquire the minimum magnetic resonance signal value and other magnetic resonance signal values ​​at each pixel position in the magnetic resonance images at multiple acquisition moments;

[0129] The fitting module 12 is used to fit the minimum magnetic resonance signal value and other magnetic resonance signal values ​​at each pixel position to obtain a first fitting result at each pixel position; and to fit the opposite of the minimum magnetic resonance signal value and other magnetic resonance signal values ​​at each pixel position to obtain a second fitting result at each pixel position;

[0130] The determination module 13 is used to determine the magnetic resonance longitudinal relaxation time measurement result according to the first fitting result and the second fitting result of each pixel position.

[0131] In an exemplary embodiment, the above-mentioned determination module includes: a first determination unit and a second determination unit, wherein:

[0132] A first determining unit, configured to determine the longitudinal relaxation time of each pixel position according to the first fitting result and the second fitting result of each pixel position;

[0133] The second determination unit is used to use the combination result of the longitudinal relaxation time of all pixel positions as the magnetic resonance longitudinal relaxation time determination result.

[0134] In an exemplary embodiment, the above-mentioned first determination unit is also used to obtain, for any pixel position, a first fitting evaluation result corresponding to the first fitting result of the pixel position, and to obtain a second fitting evaluation result corresponding to the second fitting result of the pixel position; and determine the longitudinal relaxation time of the pixel position based on the first fitting evaluation result and the second fitting evaluation result.

[0135] In an exemplary embodiment, the first determination unit is further used to obtain the vertical distance between the magnetic resonance signal value at the pixel position on each magnetic resonance image and the first fitting curve; and determine the first fitting evaluation result corresponding to the first fitting result based on the average value of each vertical distance.

[0136] In an exemplary embodiment, the above-mentioned first determination unit is also used to compare the first fitting evaluation result and the second fitting evaluation result; if the first fitting evaluation result is greater than the second fitting evaluation result, the longitudinal relaxation time corresponding to the first fitting result is used as the longitudinal relaxation time of the pixel position; if the first fitting evaluation result is less than the second fitting evaluation result, the longitudinal relaxation time corresponding to the second fitting result is used as the longitudinal relaxation time of the pixel position; if the first fitting evaluation result is equal to the second fitting evaluation result, the longitudinal relaxation time corresponding to the first fitting result or the second fitting result is used as the longitudinal relaxation time of the pixel position.

[0137] In an exemplary embodiment, the acquisition module includes: an acquisition unit and an analysis unit, wherein:

[0138] An acquisition unit, used for acquiring magnetic resonance images at multiple acquisition moments after applying an inversion recovery pulse;

[0139] The analysis unit is used to analyze the magnetic resonance signal values ​​of each pixel position in the magnetic resonance image at multiple acquisition moments, screen out the minimum magnetic resonance signal value of each pixel position from each pixel position; and use the magnetic resonance signal values ​​other than the minimum magnetic resonance signal value as other magnetic resonance signal values.

[0140] Each module in the above-mentioned magnetic resonance longitudinal relaxation time measuring device can be implemented in whole or in part by software, hardware and a combination thereof. Each of the above-mentioned modules 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 the operations corresponding to each of the above modules.

[0141] In an exemplary embodiment, a computer device is provided. The computer device may be a server, and its internal structure diagram may be as shown in FIG. Fig.12 As shown. The computer device includes a processor, a memory, an input / output interface (Input / Output, referred to as I / O) and a communication interface. The processor, the memory and the input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. 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, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store magnetic resonance longitudinal relaxation time measurement data. The input / output interface of the computer device is used to exchange information between the processor and an external device. The communication interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, a method for measuring magnetic resonance longitudinal relaxation time is implemented.

[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 an exemplary 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 content of any one embodiment of the above-mentioned method for measuring magnetic resonance longitudinal relaxation time is implemented.

[0144] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the content of any one embodiment of the above-mentioned method for measuring magnetic resonance longitudinal relaxation time is implemented.

[0145] In one embodiment, a computer program product is provided, comprising a computer program, which implements the content of any one embodiment of the above-mentioned method for measuring magnetic resonance longitudinal relaxation time when executed by a processor.

[0146] 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 used 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 must comply with relevant regulations.

[0147] 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 the present application can include at least one of non-volatile memory 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), magnetic 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, an artificial intelligence (AI) processor, etc., but are not limited to this.

[0148] 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 application.

[0149] The above 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. A method for measuring magnetic resonance longitudinal relaxation time, characterized in that: The method comprises: Acquire the minimum magnetic resonance signal value and other magnetic resonance signal values ​​at each pixel position in the magnetic resonance images at multiple acquisition moments; Fitting the minimum magnetic resonance signal value and other magnetic resonance signal values ​​at each pixel position to obtain a first fitting result at each pixel position; and fitting the inverse of the minimum magnetic resonance signal value and the other magnetic resonance signal values ​​at each pixel position to obtain a second fitting result at each pixel position; The magnetic resonance longitudinal relaxation time measurement result is determined according to the first fitting result and the second fitting result of each pixel position.

2. The method according to claim 1, characterized in that Determining the magnetic resonance longitudinal relaxation time measurement result according to the first fitting result and the second fitting result of each pixel position includes: Determine the longitudinal relaxation time of each pixel position according to the first fitting result and the second fitting result of each pixel position; The combined result of the longitudinal relaxation time at all pixel positions is taken as the magnetic resonance longitudinal relaxation time measurement result.

3. The method according to claim 2, characterized in that Determining the longitudinal relaxation time of each pixel position according to the first fitting result and the second fitting result of each pixel position includes: For any pixel position, obtaining a first fitting evaluation result corresponding to the first fitting result of the pixel position, and obtaining a second fitting evaluation result corresponding to the second fitting result of the pixel position; The longitudinal relaxation time of the pixel position is determined according to the first fitting evaluation result and the second fitting evaluation result.

4. The method according to claim 3, characterized in that The first fitting result is a first fitting curve; The obtaining of a first fitting evaluation result corresponding to the first fitting result at the pixel position includes: Acquire a vertical distance between a magnetic resonance signal value of the pixel position on each magnetic resonance image and the first fitting curve; Based on an average value of each of the vertical distances, a first fitting evaluation result corresponding to the first fitting result is determined.

5. The method according to claim 3, characterized in that: Determining the longitudinal relaxation time of the pixel position according to the first fitting evaluation result and the second fitting evaluation result includes: comparing the first fitting evaluation result and the second fitting evaluation result; If the first fitting evaluation result is greater than the second fitting evaluation result, taking the longitudinal relaxation time corresponding to the first fitting result as the longitudinal relaxation time of the pixel position; If the first fitting evaluation result is less than the second fitting evaluation result, taking the longitudinal relaxation time corresponding to the second fitting result as the longitudinal relaxation time of the pixel position; If the first fitting evaluation result is equal to the second fitting evaluation result, the longitudinal relaxation time corresponding to the first fitting result or the second fitting result is used as the longitudinal relaxation time of the pixel position.

6. The method according to any one of claims 1 to 5, characterized in that: The step of obtaining the minimum magnetic resonance signal value and other magnetic resonance signal values ​​at each pixel position in the magnetic resonance images at multiple acquisition moments includes: Acquiring magnetic resonance images at multiple acquisition times after applying an inversion recovery pulse; Analyzing the magnetic resonance signal values ​​of each pixel position in the magnetic resonance image at multiple acquisition moments, screening out the minimum magnetic resonance signal value of each pixel position from the pixel positions; and using the magnetic resonance signal values ​​other than the minimum magnetic resonance signal value as the other magnetic resonance signal values.

7. A magnetic resonance longitudinal relaxation time measurement system, characterized in that: The magnetic resonance longitudinal relaxation time determination system comprises a magnetic resonance device and a computer device; The magnetic resonance device is used to acquire magnetic resonance images at multiple acquisition moments while applying an inversion recovery pulse to a region of interest of an acquisition object; The computer device is used to fit the minimum magnetic resonance signal value and other magnetic resonance signal values ​​at each pixel position in the magnetic resonance images at the multiple acquisition moments to obtain a first fitting result for each pixel position; and to fit the inverse of the minimum magnetic resonance signal value and other magnetic resonance signal values ​​at each pixel position to obtain a second fitting result for each pixel position, and determine the magnetic resonance longitudinal relaxation time measurement result based on the first fitting result and the second fitting result for each pixel position.

8. A magnetic resonance longitudinal relaxation time measuring device, characterized in that: The device comprises: An acquisition module, used for acquiring the minimum magnetic resonance signal value and other magnetic resonance signal values ​​at each pixel position in the magnetic resonance image at multiple acquisition moments; a fitting module, configured to fit the minimum magnetic resonance signal value and other magnetic resonance signal values ​​at each pixel position to obtain a first fitting result at each pixel position; and to fit the opposite of the minimum magnetic resonance signal value and other magnetic resonance signal values ​​at each pixel position to obtain a second fitting result at each pixel position; The determination module is used to determine the magnetic resonance longitudinal relaxation time measurement result according to the first fitting result and the second fitting result of each pixel position.

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 6 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

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