Imaging signal acquisition method and system of multiple acquisition modules based on inversion recovery pulse, electronic equipment, storage medium and computer program product

Abstract

The invention provides an imaging signal acquisition method and system of multiple acquisition modules based on inversion recovery pulses, electronic equipment, a storage medium and a computer program product. The imaging signal acquisition method comprises the steps that an inversion recovery pulse is applied to a first layer of a target space position at a first moment, so that at least two acquisition modules sequentially acquire imaging signals of the first layer after first inversion recovery time, and the first inversion recovery time is the inversion recovery time of the first acquisition module; under the condition that the first inversion recovery time meets a first preset condition and the interval time between two adjacent acquisition modules does not meet a second preset condition, determining a first target layer number meeting the execution of interlayer staggered acquisition; and applying inversion recovery pulses to the layers of the first target layer number in sequence within the first inversion recovery time, so that the at least two acquisition modules acquire imaging signals of the corresponding layers in sequence after the first inversion recovery time.

Description

Technical Field

[0001] This invention relates to the field of magnetic resonance imaging, and more specifically, to an imaging signal acquisition method and system, electronic device, storage medium, and computer program product based on a multi-acquisition module using inversion recovery pulses. Background Art

[0002] Magnetic resonance imaging (MRI) is widely used in medical diagnosis due to its excellent soft tissue contrast. Conventional structural imaging (such as T1- and T2-weighted imaging) can clearly display anatomical structures, while diffusion-weighted imaging (DWI) and functional magnetic resonance imaging (fMRI) reflect tissue microstructure and neural activity through water molecule diffusion behavior and changes in cerebral blood flow, respectively. To expand imaging capabilities, MRI sequences often employ radiofrequency or gradient pulse preparation modules (such as inversion recovery pulses) to meet more imaging needs.

[0003] Inversion recovery pulses (IRPs) can enhance tissue contrast or suppress specific signals by modulating the magnetization vector relaxation process. For example, in T1-weighted imaging, IRPs can more clearly display differences in brain tissue based on an appropriate inversion recovery time (TI), thereby optimizing the contrast between gray matter, white matter, and fluid accumulation. In vascular imaging, IRPs can suppress background tissue to improve the visualization of blood vessels. Furthermore, IRPs can also be used in fat suppression (STIR) to reduce interference from fat signals.

[0004] Traditional IR sequences require a fixed time interval (TI) after applying the inversion recovery pulse before signal acquisition, resulting in a long repetition time (TR) period and reduced imaging efficiency. This is especially problematic when the TI is long (hundreds to thousands of milliseconds) while the acquisition time is short (e.g., the BOLD sequence requires only a few hundred milliseconds), leaving a significant amount of idle time unused in the IR sequence. Therefore, the inventors discovered that inversion preparation for other spatial planes can be performed within the TI waiting time of the current plane, thereby improving imaging acquisition efficiency by optimizing the idle time of the TI.

[0005] However, the inventors of this invention also discovered that in the optimization methods of the prior art, the TI waiting time is not fully used for signal acquisition of other layers or acquisition modules, and it is only applicable to a single acquisition module, which cannot support the complex timing requirements of multi-contrast or multi-echo imaging, resulting in excessively long imaging time and low imaging efficiency.

[0006] The content in the background section is merely technology known to the public and does not necessarily represent existing technology in this field. Summary of the Invention

[0007] According to one aspect of the present invention, an imaging signal acquisition method based on inversion recovery pulses using multiple acquisition modules is provided, comprising: applying an inversion recovery pulse to a first layer at a target spatial location at a first moment, such that at least two acquisition modules sequentially acquire imaging signals of the first layer after a first inversion recovery time, wherein the first inversion recovery time is the inversion recovery time of the first acquisition module; determining a first target layer number that satisfies the requirement of performing interlayer staggered acquisition when the first inversion recovery time satisfies a first preset condition and the interval between two adjacent acquisition modules does not satisfy a second preset condition; and sequentially applying inversion recovery pulses to the layers of the first target layer number within the first inversion recovery time, such that at least two acquisition modules sequentially acquire imaging signals of the corresponding layers after the first inversion recovery time.

[0008] According to another aspect of the present invention, an imaging signal acquisition system based on inversion recovery pulses and multiple acquisition modules is also provided, comprising an inversion recovery pulse application module, at least two acquisition modules, and a target layer number determination module. The inversion recovery pulse application module applies an inversion recovery pulse to a first layer at a target spatial location at a first moment. The at least two acquisition modules sequentially acquire imaging signals of the first layer after a first inversion recovery time, where the first inversion recovery time is the inversion recovery time of the first acquisition module. The target layer number determination module determines the first target layer number that satisfies the requirement of interlayer staggered acquisition if the first inversion recovery time satisfies a first preset condition and the interval between two adjacent acquisition modules does not satisfy a second preset condition. The inversion recovery pulse application module sequentially applies inversion recovery pulses to layers of the first target layer number within the first inversion recovery time, so that the at least two acquisition modules sequentially acquire imaging signals of the corresponding layers after the first inversion recovery time.

[0009] According to another aspect of the present invention, an electronic device is also provided. The electronic device includes: one or more processors; and a storage device for storing one or more programs, which, when executed by the one or more processors, enable the one or more processors to perform the methods described above.

[0010] According to another aspect of the present invention, a non-volatile computer-readable storage medium is also provided. The storage medium stores a computer program that, when executed by a processor, enables the implementation of the methods described above.

[0011] According to another aspect of the present invention, a computer program product is also provided. The computer program product includes: a computer program stored on a computer-readable storage medium; the computer program includes program instructions that, when executed by a computer, cause the computer to perform the methods described above.

[0012] Beneficial effects

[0013] This invention can determine the first target number of layers sufficient for interlayer staggered acquisition when the first inversion recovery time meets preset conditions, and then sequentially perform interlayer staggered acquisition on multiple layers within the first inversion recovery time. This fully utilizes the first inversion recovery time, thereby improving the efficiency of imaging signal acquisition. Furthermore, this invention can perform multi-contrast imaging through multiple acquisition modules, enabling multi-contrast layered imaging, inversion recovery multi-echo imaging, and other similar functions. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 A flowchart illustrating an imaging signal acquisition method according to an embodiment of the present invention is shown.

[0016] Figure 2 A schematic diagram of the structure of a magnetic resonance imaging device according to an embodiment of the present invention is shown;

[0017] Figure 3 A schematic diagram of imaging signal acquisition according to an embodiment of the present invention is shown;

[0018] Figure 4 This diagram illustrates yet another flow chart of the imaging signal acquisition method according to an embodiment of the present invention;

[0019] Figure 5 This diagram illustrates another embodiment of the imaging signal acquisition of the present invention.

[0020] Figure 6 This diagram illustrates another embodiment of the imaging signal acquisition of the present invention.

[0021] Figure 7 This diagram illustrates another embodiment of the imaging signal acquisition of the present invention.

[0022] Figure 8 A schematic diagram of the imaging signal acquisition system according to an embodiment of the present invention is shown.

[0023] Explanation of reference numerals in the attached figures:

[0024] Reverse recovery pulse application module 10; at least two acquisition modules 20; target layer number determination module 30. Detailed Implementation

[0025] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided so that the invention will be thorough and complete, and the concept of the exemplary embodiments will be fully conveyed to those skilled in the art. The same reference numerals in the drawings denote the same or similar parts, and therefore repeated descriptions of them will be omitted.

[0026] The described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a full understanding of embodiments of this disclosure. However, those skilled in the art will recognize that the technical solutions of this disclosure can be practiced without one or more of these specific details, or other methods, components, materials, devices, etc. In these cases, well-known structures, methods, devices, implementations, materials, or operations will not be shown or described in detail.

[0027] Furthermore, the terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such process, method, product, or apparatus.

[0028] The terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish different objects, rather than to describe a specific order.

[0029] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] The full names and Chinese definitions of the English abbreviations used in this invention are as follows:

[0031] T1: Longitudinal relaxation time;

[0032] T2: Lateral relaxation time;

[0033] DWI: Diffusion-weighted imaging;

[0034] fMRI: functional magnetic resonance imaging;

[0035] STIR: ShortTau Inversion Recovery, a fat-suppressing technology;

[0036] TI: Inversion Time, the time to reverse and recover from an inversion error.

[0037] IR: Inversion Recovery;

[0038] TR: Repetition Time;

[0039] BOLD: Blood Oxygenation Level Dependent;

[0040] k-space: k-space contains image frequency information;

[0041] FLAIR: Fluid Attenuated Inversion Recovery;

[0042] Sinc pulse: Radio frequency pulse waveform.

[0043] Existing technologies generally improve imaging efficiency by optimizing the IR sequence, such as:

[0044] Single acquisition module optimization: In a two-dimensional layer-selective IR sequence, the waiting time of the current layer's TI is used to prepare for the reversal of other layers, thereby achieving interlayer alternating acquisition. However, the inventors found that this method only supports a single acquisition module and cannot adapt to the imaging requirements of multiple acquisition modules or multiple contrast ratios.

[0045] Multi-contrast acquisition optimization: Dana C. Peters et al. (2006) proposed an optimization method for multi-TI data acquisition by combining IR sequences with four acquisition modules. They independently reconstructed and weighted the radial k-space data collected at four different TI times into a single k-space for reconstruction. However, the inventors found that this method did not optimize TI waiting time. While Refaat E. Gabr et al. (2018) and Yanning Liu et al. (2022) proposed optimization methods for continuous multi-contrast acquisition (such as alternating FLAIR and magnetic susceptibility weighting), the inventors found that these methods still suffer from low TI idle time utilization. Furthermore, the inventors found that multi-nuclear alternating acquisition imaging (such as...) 1 H and 23 While alternating acquisition (NA) can improve efficiency by utilizing multiple channels, its logic is not suitable for application scenarios with single-core multi-acquisition modules.

[0046] Currently, IR sequences in multi-acquisition modules still use layer-by-layer sequential acquisition, which results in excessively long imaging times, low imaging efficiency, and difficulty in meeting the clinical demand for efficient multi-contrast imaging.

[0047] According to one aspect of the present invention, an imaging signal acquisition method based on a multi-acquisition module using an inversion recovery pulse is provided. Figure 1 A flowchart illustrating an imaging signal acquisition method according to an embodiment of the present invention is shown. Figure 1 As shown, the imaging signal acquisition method includes steps S100-S300.

[0048] For example, this imaging signal acquisition method can be performed by an imaging signal acquisition system with computing capabilities.

[0049] According to the example embodiment, in step S100, the imaging signal acquisition system applies a reversal recovery pulse to the first layer of the target spatial location at a first moment, so that at least two acquisition modules sequentially acquire the imaging signal of the first layer after the first reversal recovery time, where the first reversal recovery time (TI1) is the reversal recovery time of the first acquisition module.

[0050] Figure 2 A schematic diagram of the structure of a magnetic resonance imaging device according to an embodiment of the present invention is shown.

[0051] For example, such as Figure 2 As shown, after the subject enters the magnetic resonance imaging (MRI) device, the imaging signal acquisition system responds to the user's software operation commands and applies a reversal recovery pulse to the first layer of the target spatial location (i.e., the location to be imaged) at the first moment T1. The reversal recovery pulse can use a 180° radio frequency flip angle, which can reverse the magnetization vector Mz from the positive direction of the vertical axis to the negative direction. Exemplarily, the reversal recovery pulse includes, but is not limited to, Gaussian, rectangular, Si nc pulses, or adiabatic pulse forms. The pulse form of the reversal recovery pulse can be customized according to user requirements.

[0052] According to the example embodiment, the inversion recovery pulse serves as a preparation pulse, reversing the initial magnetization vector Mz to the opposite direction. This provides a specific tissue with an opportunity for the magnetization vector Mz to recover past the zero point of signal intensity. The time it takes for longitudinal relaxation to reach the zero point varies for each tissue depending on the TI (Time Intensity) value. If a signal acquisition module is applied at the zero point of longitudinal relaxation in a certain tissue for signal acquisition, since there is no macroscopic longitudinal magnetization vector, there is no macroscopic transverse magnetization vector generated, thus achieving the purpose of suppressing the signal of that tissue, such as fat and blood. Different tissues typically require different recovery times; for example, fat has a shorter TI relaxation time, while blood has a longer TI time. After the inversion recovery pulse is applied, the TI time can be set to the moment when excitation and acquisition are needed. Different TI times can yield images with different contrasts.

[0053] For example, after the inversion recovery pulse is applied, the magnetization vector Mz enters the relaxation recovery process. Different tissues (such as gray matter, white matter, fluid, fat, and blood in the brain) have different relaxation inversion recovery times. Depending on the application, a corresponding acquisition module can be applied when the magnetization vector Mz recovers to zero to perform signal excitation and encoding acquisition, thereby inhibiting a certain tissue (such as inhibiting fat, cerebrospinal fluid, or blood when necessary). Alternatively, depending on the application, an acquisition module can be applied when the magnetization vector Mz recovers to a higher level to acquire contrast data from other tissues.

[0054] Therefore, by setting at least two acquisition modules, this invention can meet the acquisition needs of different imaging signals in different application scenarios. Exemplarily, multiple acquisition modules can be configured; two, three, or more acquisition modules can be set according to user requirements, and this invention does not impose any limitations on this.

[0055] For example, at least two acquisition modules use the same inversion recovery pulse and the same layer selection gradient. Images from different acquisition modules have the same spatial location and image structure. However, different tissues will have different contrast due to differences in TI relaxation inversion recovery time. Subsequent operations such as mutual fusion or signal calibration can be performed. This invention does not limit this.

[0056] According to the example embodiment, in step S100, after the first inversion recovery time of the applied inversion recovery pulse, at least two acquisition modules start working and sequentially acquire imaging signals of the first layer, which can be used for image construction.

[0057] The acquisition module includes a signal excitation unit and an encoding acquisition unit. The signal excitation unit can employ free induction attenuation or spin echo methods, while the encoding acquisition unit can flexibly encode and acquire imaging signals using various methods as needed. The corresponding imaging signals are then filled into the k-space for image reconstruction. The encoding acquisition unit can reconstruct the amplitude or phase of the raw data in the k-space as required to present different image formats. For example, the information collected in the k-space contains all frequency components of the image. By performing necessary low-pass filtering and Fourier transform operations on the k-space data for reconstruction, magnetic resonance imaging with different contrasts can be obtained.

[0058] It can be understood that in each IR inversion recovery pulse and imaging signal acquisition, depending on the position where the IR inversion recovery pulse is applied, subsequent acquisition modules need to use the same spatial excitation position to ensure consistent magnetization vector Mz. The acquisition excitation and encoding methods can be flexibly designed. IR inversion pulses and layer-selective excitation radio frequencies at different spatial levels undergo spatial coordinate transformation based on the selected imaging position, thus corresponding to the corresponding imaging frequencies.

[0059] For example, the acquisition duration of each of the at least two acquisition modules can be kept consistent, or it can be flexibly set according to user needs. The interval between two adjacent acquisition modules can also be kept consistent, or it can be flexibly set according to user needs.

[0060] In step S200, if the imaging signal acquisition system satisfies the first preset condition in the first reversal recovery time and the interval between two adjacent acquisition modules does not satisfy the second preset condition, it determines the first target layer number that satisfies the requirement to perform interlayer staggered acquisition.

[0061] For example, the first preset condition is that the first inversion recovery time can accommodate the acquisition duration of at least one other layer acquisition module. The second preset condition is that the interval between two adjacent acquisition modules can accommodate the acquisition duration of at least one other layer acquisition module.

[0062] That is, if the first reversal recovery time meets the first preset condition, the conditions for interlayer staggered acquisition are met.

[0063] Based on the example embodiment, it can be understood that the IR inversion recovery pulses acquired in different layers and the acquisition modules cannot overlap in time. In practical applications, there needs to be spared for the response time of radio frequency and gradient, which is usually in the order of less than milliseconds.

[0064] Once the imaging signal acquisition system determines that the conditions for interlayer staggered acquisition are met, it determines the first target layer number that satisfies the requirement to perform interlayer staggered acquisition.

[0065] For example, if the first inversion recovery time TI1 is long enough to accommodate the acquisition duration of at least one other layer acquisition module, but the interval time TD between two adjacent acquisition modules is short enough to accommodate the acquisition duration of at least one other layer acquisition module, the imaging signal acquisition system determines the number of layers (i.e., the first target layer number) that can be acquired by interlayer staggered acquisition within the first inversion recovery time TI1.

[0066] Figure 3 A schematic diagram of imaging signal acquisition according to an embodiment of the present invention is shown.

[0067] For example, Figure 3 A schematic diagram of imaging signal acquisition, including two acquisition modules, is shown. Figure 3As shown, the first inversion recovery time TI1 is long enough to accommodate the acquisition duration (TC) of at least one other layer acquisition module. However, the interval time TD between two adjacent acquisition modules (i.e., acquisition module 1 and acquisition module 2) is too short to accommodate the acquisition duration (TC) of at least one other layer acquisition module.

[0068] Optionally, in step S200, the imaging signal acquisition system determines the number of first target layers based on the sum of the first inversion recovery time, the acquisition duration of at least two acquisition modules, and the interval time between at least two acquisition modules.

[0069] For example, the formula for calculating the number of first target layers can be:

[0070] N1 = floor(TI1 / TC) 合 +1;

[0071] Where N1 is the number of the first target layers, TI1 is the first inversion recovery time, and TC is the first inversion recovery time. 合为 The sum of the acquisition duration of at least two acquisition modules and the interval between at least two acquisition modules, where floor() is a floor operation.

[0072] For example, such as Figure 3 As shown, TC 合 =TC 1+ TD + TC2 and TC1 represent the acquisition duration of acquisition module 1, TD represents the interval between acquisition module 1 and acquisition module 2, and TC2 represents the acquisition duration of acquisition module 2. For example... Figure 3 As shown, the imaging signal acquisition system can determine through calculation that, under this condition, three layers of interlayer staggered acquisition can be performed within the first inversion recovery time TI1.

[0073] In step S300, the imaging signal acquisition system applies inversion recovery pulses to the layers of the first target layer number sequentially within the first inversion recovery time, so that at least two acquisition modules sequentially acquire imaging signals of the corresponding layers after the first inversion recovery time.

[0074] For example, after determining the number of layers that can be interleaved for acquisition, the imaging signal acquisition system sequentially applies inversion recovery pulses to the corresponding layers so that at least two acquisition modules sequentially acquire the imaging signals of the corresponding layers after the first inversion recovery time. This allows full utilization of the first inversion recovery time TI1 to complete the acquisition of imaging signals with high acquisition efficiency.

[0075] like Figure 3 As shown, the IR inversion recovery pulse and TC between different layers 合Interlayer staggered acquisition can be performed, making full use of the first inversion recovery time TI1, which can improve the efficiency of imaging signal acquisition. For example, the imaging efficiency after interlayer staggered acquisition can reach 3 times that of the original acquisition.

[0076] Through the above embodiments, the present invention can determine the first target number of layers sufficient for interlayer staggered acquisition when the first inversion recovery time meets preset conditions, and sequentially perform interlayer staggered acquisition on multiple layers within the first inversion recovery time. This fully utilizes the first inversion recovery time, thereby improving the efficiency of imaging signal acquisition. Furthermore, the present invention can perform multi-contrast imaging through multiple acquisition modules, enabling support for multi-contrast layered imaging, inversion recovery multi-echo imaging, and other technologies.

[0077] Optionally, in step S300, when the number of first target layers is three, the imaging signal acquisition system applies a reverse recovery pulse to the second layer of the target spatial location at a second time, and applies a reverse recovery pulse to the third layer of the target spatial location at a third time.

[0078] The second moment is:

[0079] TC 合 ≤T2≤TI1-TC 合 ;

[0080] The third moment is:

[0081] 2TC 合 ≤T3≤TI1;

[0082] Among them, TC 合 The time interval is the sum of the acquisition duration of at least two acquisition modules and the interval between two adjacent acquisition modules in the at least two acquisition modules, where T2 is the second time moment, T3 is the third time moment, and TI1 is the first inversion recovery time.

[0083] For example, such as Figure 3 As shown, the imaging signal acquisition system can apply inversion recovery pulses to the corresponding layers at the second time T2 and the third time T3, respectively, thereby ensuring that interlayer staggered acquisition is performed during the first inversion recovery time and that multiple acquisition modules with interlayer staggered distribution at different layers do not overlap in time.

[0084] Figure 4 This diagram illustrates yet another flow chart of the imaging signal acquisition method according to an embodiment of the present invention. Figure 4 As shown, the imaging signal acquisition method includes steps S400-S500.

[0085] According to the example embodiment, in step S400, if the imaging signal acquisition system satisfies the first preset condition in the first reversal recovery time and the interval time between two adjacent acquisition modules satisfies the second preset condition, it determines the second target number of layers that satisfies the requirement to perform interlayer staggered acquisition.

[0086] For example, the first preset condition is that the first inversion recovery time can accommodate the acquisition duration of at least one other layer acquisition module. The second preset condition is that the interval time between two adjacent acquisition modules can accommodate the acquisition duration of at least one other layer acquisition module. That is, when the first inversion recovery time TI1 is long enough to accommodate the acquisition duration of at least one other layer acquisition module, and the interval time TD between two adjacent acquisition modules is also long enough to accommodate the acquisition duration of at least one other layer acquisition module, the imaging signal acquisition system determines the number of layers that can perform interlayer staggered acquisition (i.e., the second target number of layers).

[0087] Figure 5 This diagram illustrates another embodiment of the imaging signal acquisition of the present invention. Figure 6 This is another schematic diagram illustrating the acquisition of imaging signals according to an embodiment of the present invention.

[0088] For example, Figure 5 or Figure 6 A schematic diagram of imaging signal acquisition, including three acquisition modules, is shown. Figure 5 or Figure 6 As shown, the first inversion recovery time TI1 is long enough to accommodate the acquisition duration (TC) of at least one other layer acquisition module. Furthermore, the interval time TD between two adjacent acquisition modules (i.e., acquisition module 1 and acquisition module 2, acquisition module 2 and acquisition module 3) is also long enough to accommodate the acquisition duration (TC) of at least one other layer acquisition module.

[0089] In step S500, the imaging signal acquisition system sequentially applies inversion recovery pulses to the layers of the second target layer number, so that at least two acquisition modules sequentially acquire imaging signals of the corresponding layers.

[0090] For example, after determining the number of layers that can be interleaved for acquisition, the imaging signal acquisition system sequentially applies inversion recovery pulses to the corresponding layers. During this process, it is crucial to ensure that the IR inversion recovery pulses from different interleaved layers and the multiple acquisition modules do not overlap in time.

[0091] Optionally, in step S400, when the imaging signal acquisition system has different acquisition durations for each of the at least two acquisition modules and different intervals between adjacent acquisition modules, the second target layer number is determined based on the first inversion recovery time, the acquisition duration of each acquisition module, and the interval between each acquisition module.

[0092] For example, such as Figure 5 As shown, the acquisition duration of each acquisition module is different (e.g., the acquisition duration TC1 of acquisition module 1, TC2 of acquisition module 2, and TC3 of acquisition module 3 are all different), and the interval between each pair of adjacent acquisition modules is also different (e.g., the interval TD1 between acquisition modules 1 and 2, and the interval TD2 between acquisition modules 2 and 3 are different). In this case, layer-interleaved acquisition is performed using the minimum allowed number of acquisition modules among the idle time portions TI1, TD1, TD2, ..., TDn in the current layer.

[0093] For example, in this case, the formula for calculating the number of second target layers can be:

[0094] N2=floor{Min(TI1 / TC1, TD1 / TC2,..., TDn / TCn+1)+1};

[0095] Where N2 is the number of the second target layers, TI1 is the first inversion recovery time, TDn is the nth interval time, TCn+1 is the acquisition duration of the (n+1)th acquisition module, floor() is the floor operation, and Min() is the minimum value operation.

[0096] For example, such as Figure 5 As shown, in this case, acquisition module 1, acquisition module 2, and acquisition module 3 can acquire three imaging signal data on the same layer, thus achieving three different image contrasts. Furthermore, combined with TI1, interlayer staggered acquisition across the three layers can be achieved, resulting in imaging efficiency three times that of the original acquisition.

[0097] Optionally, in step S400, the imaging signal acquisition system determines the number of second target layers based on the first inversion recovery time, the acquisition duration, and the interval time, provided that the acquisition duration of each acquisition module in at least two acquisition modules is the same and the interval time between each pair of adjacent acquisition modules is also the same.

[0098] For example, such as Figure 6As shown, the acquisition duration of each acquisition module is the same (e.g., the acquisition duration TC of acquisition module 1, acquisition module 2, and acquisition module 3 are all the same), and the interval between each pair of adjacent acquisition modules is also the same (e.g., the interval TD between acquisition modules 1 and 2, and the interval TD between acquisition modules 2 and 3 are the same). Therefore, in this case, within the time interval TI1 and the acquisition module interval TD, we can simply consider interlayer staggered acquisition of the same type of acquisition module.

[0099] For example, in this case, the formula for calculating the number of second target layers can be:

[0100] N2 = Min(TI1 / TC, TD / TC) + 1;

[0101] Where N2 is the number of the second target layers, TI1 is the first inversion recovery time, TD is the interval time, and TC is the acquisition duration.

[0102] For example, such as Figure 6 As shown, in this case, acquisition module 1, acquisition module 2, and acquisition module 3 can acquire three imaging signal data on one layer, thus achieving three different image contrasts. Furthermore, combined with TI1, four layers of interlayer staggered acquisition can be achieved, resulting in an imaging efficiency four times that of the original acquisition.

[0103] Through the above embodiments, the present invention can determine the second target number of layers sufficient for interlayer staggered acquisition when both the first inversion recovery time and the interval between two adjacent acquisition modules meet preset conditions. This enables multi-layer interlayer staggered acquisition, thereby improving the efficiency of imaging signal acquisition. Furthermore, the present invention can perform multi-contrast imaging through multiple acquisition modules, enabling multi-contrast layered imaging, inversion recovery multi-echo imaging, and other similar functions.

[0104] Optionally, in step S400, when the number of second target layers is three, the imaging signal acquisition system applies a reverse recovery pulse to the second layer of the target spatial location at a second time, and applies a reverse recovery pulse to the third layer of the target spatial location at a third time.

[0105] The second moment is:

[0106] TC 合 ≤T2≤TI1-TC 合 ;

[0107] The third moment is:

[0108] 2TC 合 ≤T3≤TI1;

[0109] Among them, TC 合 The time interval is the sum of the acquisition duration of at least two acquisition modules and the interval between two adjacent acquisition modules in the at least two acquisition modules, where T2 is the second time moment, T3 is the third time moment, and TI1 is the first inversion recovery time.

[0110] For example, the imaging signal acquisition system can apply inversion recovery pulses to the corresponding layers at the second time T2 and the third time T3, respectively, so as to ensure that multiple acquisition modules with interlayer distribution at different layers do not overlap in time.

[0111] Optionally, if the imaging signal acquisition system does not meet the first preset condition in the first inversion recovery time and does not meet the second preset condition in the interval between two adjacent acquisition modules, it adopts a layer-by-layer sequential acquisition method to acquire imaging signals from multiple layers.

[0112] Figure 7 This is another schematic diagram illustrating the acquisition of imaging signals according to an embodiment of the present invention.

[0113] For example, Figure 7 A schematic diagram of imaging signal acquisition, including two acquisition modules, is shown. Figure 7 As shown, both the first inversion recovery time TI1 and the interval time TD between two adjacent acquisition modules (i.e., acquisition module 1 and acquisition module 2) are relatively short, and neither can accommodate the acquisition duration of at least one acquisition module in another layer. Therefore, the imaging signal acquisition system needs to complete the acquisition of imaging signals in one layer before proceeding to the next layer for imaging signal acquisition.

[0114] According to another aspect of the present invention, an imaging signal acquisition system based on a multi-acquisition module of inversion recovery pulse is provided. Figure 8 A schematic diagram of the imaging signal acquisition system according to an embodiment of the present invention is shown.

[0115] According to the example embodiment, such as Figure 8 As shown, the imaging signal acquisition system 1 includes a reverse recovery pulse application module 10, at least two acquisition modules 20, and a target layer number determination module 30.

[0116] According to the example embodiment, the inversion recovery pulse application module 10 applies an inversion recovery pulse to the first layer of the target spatial location at a first moment, so that at least two acquisition modules 20 sequentially acquire the imaging signal of the first layer after the first inversion recovery time, where the first inversion recovery time (TI1) is the inversion recovery time of the first acquisition module.

[0117] For example, such as Figure 2As shown, after the subject enters the magnetic resonance imaging (MRI) device, the inversion recovery pulse application module 10 responds to the user's software operation command and applies an inversion recovery pulse to the first layer of the target spatial location (i.e., the imaging location) at the first moment T1. The inversion recovery pulse can use a 180° radio frequency flip angle, which can reverse the magnetization vector Mz from the positive direction of the vertical axis to the negative direction. Exemplarily, the inversion recovery pulse includes, but is not limited to, Gaussian, rectangular, Sinc, or adiabatic pulse forms. The pulse form of the inversion recovery pulse can be customized according to user requirements.

[0118] According to the example embodiment, the inversion recovery pulse serves as a preparation pulse, reversing the initial magnetization vector Mz to the opposite direction. This provides a specific tissue with an opportunity for the magnetization vector Mz to recover past the zero point of signal intensity. The time it takes for longitudinal relaxation to reach the zero point varies for each tissue depending on the TI (Time Intensity) value. If a signal acquisition module is applied at the zero point of longitudinal relaxation in a certain tissue for signal acquisition, since there is no macroscopic longitudinal magnetization vector, there is no macroscopic transverse magnetization vector generated, thus achieving the purpose of suppressing the signal of that tissue, such as fat and blood. Different tissues typically require different recovery times; for example, fat has a shorter TI relaxation time, while blood has a longer TI time. After the inversion recovery pulse is applied, the TI time can be set to the moment when excitation and acquisition are needed. Different TI times can yield images with different contrasts.

[0119] For example, after the inversion recovery pulse is applied, the magnetization vector Mz enters the relaxation recovery process. Different tissues (such as gray matter, white matter, fluid, fat, and blood in the brain) have different relaxation inversion recovery times. Depending on the application, a corresponding acquisition module can be applied when the magnetization vector Mz recovers to zero to perform signal excitation and encoding acquisition, thereby inhibiting a certain tissue (such as inhibiting fat, cerebrospinal fluid, or blood when necessary). Alternatively, depending on the application, an acquisition module can be applied when the magnetization vector Mz recovers to a higher level to acquire contrast data from other tissues.

[0120] Therefore, by providing at least two acquisition modules 20, this invention can meet the acquisition needs of different imaging signals in various practical application scenarios. Exemplarily, multiple acquisition modules can be configured; two, three, or more acquisition modules can be set according to user requirements, and this invention does not impose any limitations on this.

[0121] For example, at least two acquisition modules 20 use the same inversion recovery pulse and the same layer selection gradient. The images from different acquisition modules have the same spatial location and image structure, while different tissues will have different contrast due to the difference in TI relaxation inversion recovery time. Subsequent operations such as mutual fusion or signal calibration can be performed. This invention does not limit this.

[0122] According to the example embodiment, after the first inversion recovery time of the applied inversion recovery pulse, at least two acquisition modules 20 start working and sequentially acquire imaging signals of the first layer, which can be used for image construction.

[0123] The acquisition module includes a signal excitation unit and an encoding acquisition unit. The signal excitation unit can employ free induction attenuation or spin echo methods, while the encoding acquisition unit can flexibly encode and acquire imaging signals using various methods as needed. The corresponding imaging signals are then filled into the k-space for image reconstruction. The encoding acquisition unit can reconstruct the amplitude or phase of the raw data in the k-space as required to present different image formats. For example, the information collected in the k-space contains all frequency components of the image. By performing necessary low-pass filtering and Fourier transform operations on the k-space data for reconstruction, magnetic resonance imaging with different contrasts can be obtained.

[0124] It can be understood that in each IR inversion recovery pulse and imaging signal acquisition, depending on the position where the IR inversion recovery pulse is applied, subsequent acquisition modules need to use the same spatial excitation position to ensure consistent magnetization vector Mz. The acquisition excitation and encoding methods can be flexibly designed. IR inversion pulses and layer-selective excitation radio frequencies at different spatial levels undergo spatial coordinate transformation based on the selected imaging position, thus corresponding to the corresponding imaging frequencies.

[0125] For example, the acquisition duration of each acquisition module in at least two acquisition modules 20 can be kept consistent, or it can be flexibly set according to user needs. The interval between two adjacent acquisition modules in at least two acquisition modules can be kept consistent, or it can be flexibly set according to user needs.

[0126] According to the example embodiment, the target layer number determination module 30 determines the first target layer number that satisfies the interlayer staggered acquisition when the first inversion recovery time meets the first preset condition and the interval time between two adjacent acquisition modules does not meet the second preset condition.

[0127] For example, the first preset condition is that the first inversion recovery time can accommodate the acquisition duration of at least one other layer acquisition module. The second preset condition is that the interval between two adjacent acquisition modules can accommodate the acquisition duration of at least one other layer acquisition module.

[0128] That is, if the first reversal recovery time meets the first preset condition, the conditions for interlayer staggered acquisition are met.

[0129] Based on the example embodiment, it can be understood that the IR inversion recovery pulses acquired in different layers and the acquisition modules cannot overlap in time. In practical applications, there needs to be spared for the response time of radio frequency and gradient, which is usually in the order of less than milliseconds.

[0130] The target layer number determination module 30 determines the first target layer number that satisfies the conditions for performing interlayer staggered acquisition, provided that the conditions for interlayer staggered acquisition are met.

[0131] For example, if the first inversion recovery time TI1 is long enough to accommodate the acquisition duration of at least one other layer acquisition module, but the interval time TD between two adjacent acquisition modules is short enough to accommodate the acquisition duration of at least one other layer acquisition module, the target layer number determination module 30 determines the number of layers that can perform interlayer staggered acquisition within the first inversion recovery time TI1 (i.e., the first target layer number).

[0132] For example, Figure 3 A schematic diagram of imaging signal acquisition, including two acquisition modules, is shown. Figure 3 As shown, the first inversion recovery time TI1 is long enough to accommodate the acquisition duration (TC) of at least one other layer acquisition module. However, the interval time TD between two adjacent acquisition modules (i.e., acquisition module 1 and acquisition module 2) is too short to accommodate the acquisition duration (TC) of at least one other layer acquisition module.

[0133] Optionally, the target layer number determination module 30 determines the first target layer number based on the sum of the first inversion recovery time, the acquisition duration of at least two acquisition modules, and the interval time between at least two acquisition modules.

[0134] For example, the formula for calculating the number of first target layers can be:

[0135] N1 = floor(TI1 / TC) 合 +1;

[0136] Where N1 is the number of the first target layers, TI1 is the first inversion recovery time, and TC is the first inversion recovery time. 合为 The sum of the acquisition duration of at least two acquisition modules and the interval between at least two acquisition modules, where floor() is a floor operation.

[0137] For example, such as Figure 3 As shown, TC 合 =TC 1+ TD + TC2 and TC1 represent the acquisition duration of acquisition module 1, TD represents the interval between acquisition module 1 and acquisition module 2, and TC2 represents the acquisition duration of acquisition module 2. For example... Figure 3 As shown, the target layer number determination module 30 can determine through calculation that, in this case, three layers of interlayer staggered acquisition can be performed within the first inversion recovery time TI1.

[0138] The inversion recovery pulse application module 10 applies inversion recovery pulses sequentially to the layers of the first target layer number during the first inversion recovery time, so that at least two acquisition modules 20 sequentially acquire imaging signals of the corresponding layers after the first inversion recovery time.

[0139] For example, after determining the number of layers that can be interleaved for acquisition, the inversion recovery pulse application module 10 sequentially applies inversion recovery pulses to the corresponding layers so that at least two acquisition modules 20 sequentially acquire the imaging signals of the corresponding layers after the first inversion recovery time, thereby making full use of the first inversion recovery time TI1 and completing the acquisition of imaging signals with high acquisition efficiency.

[0140] like Figure 3 As shown, the IR inversion recovery pulse and TC between different layers 合 Interlayer staggered acquisition can be performed, making full use of the first inversion recovery time TI1, which can improve the efficiency of imaging signal acquisition. For example, the imaging efficiency after interlayer staggered acquisition can reach 3 times that of the original acquisition.

[0141] Through the above embodiments, the present invention can determine the first target number of layers sufficient for interlayer staggered acquisition when the first inversion recovery time meets preset conditions, and sequentially perform interlayer staggered acquisition on multiple layers within the first inversion recovery time. This fully utilizes the first inversion recovery time, thereby improving the efficiency of imaging signal acquisition. Furthermore, the present invention can perform multi-contrast imaging through multiple acquisition modules, enabling support for multi-contrast layered imaging, inversion recovery multi-echo imaging, and other technologies.

[0142] When the first target layer has three layers, the inversion recovery pulse application module 10 applies an inversion recovery pulse to the second layer of the target spatial location at the second time, and applies an inversion recovery pulse to the third layer of the target spatial location at the third time.

[0143] The second moment is:

[0144] TC 合 ≤T2≤TI1-TC 合 ;

[0145] The third moment is:

[0146] 2TC 合 ≤T3≤TI1;

[0147] Among them, TC合 The time interval is the sum of the acquisition duration of at least two acquisition modules and the interval between two adjacent acquisition modules in the at least two acquisition modules, where T2 is the second time moment, T3 is the third time moment, and TI1 is the first inversion recovery time.

[0148] For example, such as Figure 3 As shown, the inversion recovery pulse application module 10 can apply inversion recovery pulses to the corresponding layers at the second time T2 and the third time T3, respectively, thereby ensuring that interlayer staggered acquisition is performed during the first inversion recovery time and that multiple acquisition modules with interlayer staggered distribution at different layers do not overlap in time.

[0149] According to the example embodiment, the target layer number determination module 30 determines the second target layer number that satisfies the requirement of performing interlayer staggered acquisition when the first inversion recovery time meets the first preset condition and the interval time between two adjacent acquisition modules meets the second preset condition.

[0150] For example, the first preset condition is that the first inversion recovery time can accommodate the acquisition duration of at least one acquisition module from another layer. The second preset condition is that the interval between two adjacent acquisition modules can accommodate the acquisition duration of at least one acquisition module from another layer. That is, if the first inversion recovery time TI1 is long enough to accommodate the acquisition duration of at least one acquisition module from another layer, and the interval time TD between two adjacent acquisition modules is also long enough to accommodate the acquisition duration of at least one acquisition module from another layer, the target layer number determination module 30 determines the number of layers that can perform interlayer staggered acquisition (i.e., the second target layer number).

[0151] For example, Figure 5 or Figure 6 A schematic diagram of imaging signal acquisition, including three acquisition modules, is shown. Figure 5 or Figure 6 As shown, the first inversion recovery time TI1 is long enough to accommodate the acquisition duration (TC) of at least one other layer acquisition module. Furthermore, the interval time TD between two adjacent acquisition modules (i.e., acquisition module 1 and acquisition module 2, acquisition module 2 and acquisition module 3) is also long enough to accommodate the acquisition duration (TC) of at least one other layer acquisition module.

[0152] The inversion recovery pulse application module 10 applies inversion recovery pulses sequentially to the layers of the second target layer, so that at least two acquisition modules 20 sequentially acquire imaging signals of the corresponding layers.

[0153] For example, after determining the number of layers for which interlayer staggered acquisition can be performed, the inversion recovery pulse application module 10 sequentially applies inversion recovery pulses to the corresponding layers. During the process of the inversion recovery pulse application module 10 sequentially applying inversion recovery pulses to the corresponding layers, it is necessary to ensure that the IR inversion recovery pulses with different interlayer staggered distributions and the multiple acquisition modules do not overlap in time.

[0154] Optionally, when the acquisition duration of each acquisition module in at least two acquisition modules 20 is different, and the interval time between two adjacent acquisition modules is also different, the target layer number determination module 30 determines the second target layer number based on the first inversion recovery time, the acquisition duration of each acquisition module, and the interval time between each acquisition module.

[0155] For example, such as Figure 5 As shown, the acquisition duration of each acquisition module is different (e.g., the acquisition duration TC1 of acquisition module 1, TC2 of acquisition module 2, and TC3 of acquisition module 3 are all different), and the interval between each pair of adjacent acquisition modules is also different (e.g., the interval TD1 between acquisition modules 1 and 2, and the interval TD2 between acquisition modules 2 and 3 are different). In this case, layer-interleaved acquisition is performed using the minimum allowed number of acquisition modules among the idle time portions TI1, TD1, TD2, ..., TDn in the current layer.

[0156] For example, in this case, the formula for calculating the number of second target layers can be:

[0157] N2=floor{Min(TI1 / TC1, TD1 / TC2,..., TDn / TCn+1)+1};

[0158] Where N2 is the number of the second target layers, TI1 is the first inversion recovery time, TDn is the nth interval time, TCn+1 is the acquisition duration of the (n+1)th acquisition module, floor() is the floor operation, and Min() is the minimum value operation.

[0159] For example, such as Figure 5 As shown, in this case, acquisition module 1, acquisition module 2, and acquisition module 3 can acquire three imaging signal data on the same layer, thus achieving three different image contrasts. Furthermore, combined with TI1, interlayer staggered acquisition across the three layers can be achieved, resulting in imaging efficiency three times that of the original acquisition.

[0160] Optionally, the target layer number determination module 30 determines the second target layer number based on the first inversion recovery time, the acquisition duration, and the interval time when the acquisition duration of each acquisition module in at least two acquisition modules 20 is the same and the interval time between each pair of adjacent acquisition modules is also the same.

[0161] For example, such as Figure 6 As shown, the acquisition duration of each acquisition module is the same (e.g., the acquisition duration TC of acquisition module 1, acquisition module 2, and acquisition module 3 are all the same), and the interval between each pair of adjacent acquisition modules is also the same (e.g., the interval TD between acquisition modules 1 and 2, and the interval TD between acquisition modules 2 and 3 are the same). Therefore, in this case, within the time interval TI1 and the acquisition module interval TD, we can simply consider interlayer staggered acquisition of the same type of acquisition module.

[0162] For example, in this case, the formula for calculating the number of second target layers can be:

[0163] N2 = Min(TI1 / TC, TD / TC) + 1;

[0164] Where N2 is the number of the second target layers, TI1 is the first inversion recovery time, TD is the interval time, and TC is the acquisition duration.

[0165] For example, such as Figure 6 As shown, in this case, acquisition module 1, acquisition module 2, and acquisition module 3 can acquire three imaging signal data on one layer, thus achieving three different image contrasts. Furthermore, combined with TI1, four layers of interlayer staggered acquisition can be achieved, resulting in an imaging efficiency four times that of the original acquisition.

[0166] Through the above embodiments, the present invention can determine the second target number of layers sufficient for interlayer staggered acquisition when both the first inversion recovery time and the interval between two adjacent acquisition modules meet preset conditions. This enables multi-layer interlayer staggered acquisition, thereby improving the efficiency of imaging signal acquisition. Furthermore, the present invention can perform multi-contrast imaging through multiple acquisition modules, enabling multi-contrast layered imaging, inversion recovery multi-echo imaging, and other similar functions.

[0167] Optionally, when the number of second target layers is three, the inversion recovery pulse application module 10 applies an inversion recovery pulse to the second layer of the target spatial location at a second time, and the inversion recovery pulse application module 10 applies an inversion recovery pulse to the third layer of the target spatial location at a third time.

[0168] The second moment is:

[0169] TC 合 ≤T2≤TI1-TC 合 ;

[0170] The third moment is:

[0171] 2TC 合 ≤T3≤TI1;

[0172] Among them, TC 合 The time interval is the sum of the acquisition duration of at least two acquisition modules and the interval between two adjacent acquisition modules in the at least two acquisition modules, where T2 is the second time moment, T3 is the third time moment, and TI1 is the first inversion recovery time.

[0173] For example, the inversion recovery pulse application module 10 can apply inversion recovery pulses to the corresponding layers at the second time T2 and the third time T3, respectively, so as to ensure that multiple acquisition modules with interleaved distribution at different layers do not overlap in time.

[0174] Optionally, if at least two acquisition modules 20 do not meet the first preset condition in the first reversal recovery time and do not meet the second preset condition in the interval between two adjacent acquisition modules, they may adopt a layer-by-layer sequential acquisition method to acquire imaging signals from multiple layers.

[0175] For example, Figure 7 A schematic diagram of imaging signal acquisition, including two acquisition modules, is shown. Figure 7 As shown, both the first inversion recovery time TI1 and the interval time TD between two adjacent acquisition modules (i.e., acquisition module 1 and acquisition module 2) are relatively short, and neither can accommodate the acquisition duration of at least one acquisition module in another layer. Therefore, the imaging signal acquisition system needs to complete the acquisition of imaging signals in one layer before proceeding to the next layer for imaging signal acquisition.

[0176] According to another aspect of the present invention, an electronic device is also provided. The electronic device includes: one or more processors; and a storage device for storing one or more programs, which, when executed by the one or more processors, enable the one or more processors to perform the methods described above.

[0177] According to another aspect of the present invention, a non-volatile computer-readable storage medium is also provided. The storage medium stores a computer program that, when executed by a processor, enables the implementation of the methods described above.

[0178] According to another aspect of the present invention, a computer program product is also provided. The computer program product includes: a computer program stored on a computer-readable storage medium; the computer program includes program instructions that, when executed by a computer, cause the computer to perform the methods described above.

[0179] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions of the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An imaging signal acquisition method based on a multi-acquisition module using inversion recovery pulses, characterized in that, include: An inversion recovery pulse is applied to the first layer of the target spatial location at the first moment, so that at least two acquisition modules sequentially acquire the imaging signal of the first layer after the first inversion recovery time, where the first inversion recovery time is the inversion recovery time of the first acquisition module; If the first reversal recovery time meets the first preset condition and the interval between two adjacent acquisition modules does not meet the second preset condition, the first target number of layers that meets the requirements for performing interlayer staggered acquisition is determined. During the first inversion recovery time, inversion recovery pulses are sequentially applied to the layers of the first target layer number, so that the at least two acquisition modules sequentially acquire imaging signals of the corresponding layers after the first inversion recovery time.

2. The imaging signal acquisition method according to claim 1, characterized in that, The determination of the first target layer number that satisfies the inter-layer staggered acquisition requirement includes: The first target layer number is determined based on the sum of the first reversal recovery time, the acquisition duration of the at least two acquisition modules, and the interval time between two adjacent acquisition modules.

3. The imaging signal acquisition method according to claim 1, characterized in that, When the first target number of layers is three, the step of sequentially applying inversion recovery pulses to the layers of the first target number of layers within the first inversion recovery time includes: A reversal recovery pulse is applied to the second layer of the target spatial location at a second time point, where the second time point is: TC 合 ≤T2≤TI1-TC 合 ; A reversal recovery pulse is applied to the third layer of the target spatial location at the third time point, wherein the third time point is: 2TC 合 ≤T3≤TI1; Among them, TC 合 The time interval is the sum of the acquisition duration of the at least two acquisition modules and the interval between two adjacent acquisition modules, where T2 is the second time moment, T3 is the third time moment, and TI1 is the first inversion recovery time.

4. The imaging signal acquisition method according to claim 1, characterized in that, The imaging signal acquisition method further includes: If the first reversal recovery time meets the first preset condition and the interval between two adjacent acquisition modules meets the second preset condition, the second target number of layers that meet the requirements for performing interlayer staggered acquisition is determined. Inversion recovery pulses are applied sequentially to the layers of the second target layer, so that the at least two acquisition modules sequentially acquire imaging signals of the corresponding layers.

5. The imaging signal acquisition method according to claim 4, characterized in that, When the acquisition duration of each of the at least two acquisition modules is different, and the interval between each pair of adjacent acquisition modules is also different, determining the second target number of layers that satisfies the requirement of performing interlayer staggered acquisition includes: The number of the second target layers is determined based on the first reversal recovery time, the acquisition duration of each acquisition module, and each interval.

6. The imaging signal acquisition method according to claim 4, characterized in that, When the acquisition duration of each of the at least two acquisition modules is the same, and the interval between each pair of adjacent acquisition modules is also the same, determining the second target number of layers that satisfies the requirement of performing interlayer staggered acquisition includes: The number of the second target layers is determined based on the first reversal recovery time, the acquisition duration, and the interval time.

7. An imaging signal acquisition system based on a multi-acquisition module using inversion recovery pulses, characterized in that, The imaging signal acquisition system performs the imaging signal acquisition method as described in any one of claims 1-6, and the imaging signal acquisition system comprises: The inversion recovery pulse application module applies an inversion recovery pulse to the first layer of the target spatial location at the first moment; At least two acquisition modules sequentially acquire imaging signals of the first layer after the first inversion recovery time, where the first inversion recovery time is the inversion recovery time of the first acquisition module. The target layer number determination module determines the first target layer number that satisfies the requirement of performing interlayer staggered acquisition when the first inversion recovery time meets the first preset condition and the interval time between two adjacent acquisition modules does not meet the second preset condition. The inversion recovery pulse application module applies inversion recovery pulses sequentially to the layers of the first target layer number within the first inversion recovery time, so that the at least two acquisition modules sequentially acquire imaging signals of the corresponding layers after the first inversion recovery time.

8. An electronic device, characterized in that, include: one or more processors; Storage device for storing one or more programs; When the one or more programs are executed by the one or more processors, the one or more processors implement the imaging signal acquisition method as described in any one of claims 1-6.

9. A non-volatile computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the imaging signal acquisition method as described in any one of claims 1-6.

10. A computer program product, characterized in that, The method includes a computer program stored on a computer-readable storage medium, the computer program including program instructions that, when executed by a computer, cause the computer to perform the imaging signal acquisition method as described in any one of claims 1-6.

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