CN114398803A - Shimming joint simulation method and device, electronic equipment and storage medium - Google Patents
Shimming joint simulation method and device, electronic equipment and storage medium Download PDFInfo
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Abstract
The embodiment of the invention discloses a shimming joint simulation method, a shimming joint simulation device, electronic equipment and a storage medium, wherein the method comprises the following steps: acquiring initial simulation data generated by the simulation software executing electromagnetic simulation operation based on the initial configuration data, performing shimming analysis on the initial simulation data to obtain target amplitude-phase data, and sending the target amplitude-phase data to the simulation software; acquiring power loss density distribution data corresponding to target amplitude-phase data determined by simulation software, and determining specific absorption rate data corresponding to the power loss density distribution data; and if the specific absorption rate data is larger than or equal to the preset threshold value, generating current amplitude-phase data based on a preset iteration interval by taking the target amplitude-phase data as a starting point, controlling the simulation software to execute the electromagnetic simulation operation again based on the current amplitude-phase data to obtain current initial simulation data, and returning to the step of performing shimming analysis on the initial simulation data. The problem that the existing method can not realize the automation of radio frequency shimming simulation on the premise of ensuring the radio frequency safety is solved.
Description
Technical Field
The embodiment of the invention relates to the field of medical data processing, in particular to a shimming joint simulation method and device, electronic equipment and a storage medium.
Background
In the prior art, because an electromagnetic field numerical simulation tool does not have the programming post-processing capability, electromagnetic simulation and shimming analysis are two independent processes. In the electromagnetic simulation process, a user needs to obtain an electromagnetic simulation result of the radio frequency transmitting coil through a traditional field model simulation algorithm or a field-circuit integrated simulation method, and then manually export the electromagnetic simulation result. In the shimming analysis process, a user needs to read the derived electromagnetic simulation result in an external programming environment and perform shimming analysis on the electromagnetic simulation result to obtain radio frequency shimming distribution.
When the whole body of a human body is imaged, the region with uneven radio frequency transmitting field is mainly the abdomen, and the maximum cross section area of the human body is provided, so that the data volume of the electromagnetic field on the abdominal layer is very large, the data transfer and transmission are time-consuming and labor-consuming, and great burden is brought to simulation personnel.
In summary, the applicant finds that, in the process of implementing the embodiment of the present invention, at least, the existing electromagnetic simulation and shimming analysis method has a problem that the automation of the radio frequency shimming simulation cannot be quickly implemented on the premise of ensuring the radio frequency safety.
Disclosure of Invention
The embodiment of the invention provides a shimming joint simulation method, a shimming joint simulation device, electronic equipment and a storage medium, and solves the problem that the existing electromagnetic simulation and shimming analysis method cannot rapidly realize the automation of radio frequency shimming simulation on the premise of ensuring the radio frequency safety.
In a first aspect, an embodiment of the present invention provides a shimming joint simulation method, where the method includes:
acquiring initial simulation data generated by simulation software executing electromagnetic simulation operation based on initial configuration data, wherein the initial configuration data comprises initial amplitude-phase data of each transmitting channel of a radio frequency transmitting coil;
shimming analysis is carried out on the initial simulation data to obtain target amplitude-phase data, and the target amplitude-phase data is sent to the simulation software;
acquiring power loss density distribution data corresponding to the target amplitude-phase data determined by the simulation software, and determining specific absorption rate data corresponding to the power loss density distribution data;
and if the specific absorption rate data is larger than or equal to a preset threshold value, generating current amplitude and phase data based on a preset iteration interval by taking the target amplitude and phase data as a starting point, controlling the simulation software to execute electromagnetic simulation operation again based on the current amplitude and phase data to obtain current initial simulation data, and returning to the step of performing shimming analysis on the initial simulation data to obtain the target amplitude and phase data.
In a second aspect, an embodiment of the present invention further provides a shimming joint simulation apparatus, where the apparatus includes:
the system comprises an initial simulation data acquisition module, a data processing module and a data processing module, wherein the initial simulation data acquisition module is used for acquiring initial simulation data generated by simulation software executing electromagnetic simulation operation based on initial configuration data, and the initial configuration data comprises initial amplitude-phase data of each transmitting channel of a radio frequency transmitting coil;
the shimming analysis module is used for carrying out shimming analysis on the initial simulation data to obtain target amplitude-phase data and sending the target amplitude-phase data to the simulation software;
a power loss density distribution data acquisition module, configured to acquire power loss density distribution data corresponding to the target amplitude-phase data determined by the simulation software, and determine specific absorption rate data corresponding to the power loss density distribution data;
and the radio frequency safety verification module is used for generating current amplitude-phase data based on a preset iteration interval by taking the target amplitude-phase data as a starting point if the specific absorption rate data is greater than or equal to a preset threshold, controlling the simulation software to execute electromagnetic simulation operation again based on the current amplitude-phase data to obtain current initial simulation data, and returning to the step of performing shimming analysis on the initial simulation data to obtain the target amplitude-phase data.
In a third aspect, an embodiment of the present invention further provides an electronic device, where the electronic device includes:
one or more processors;
storage means for storing one or more programs;
when executed by the one or more processors, cause the one or more processors to implement the shimming joint simulation method of any embodiment.
In a fourth aspect, embodiments of the present invention also provide a storage medium containing computer-executable instructions for performing any of the shimming joint simulation methods when executed by a computer processor.
According to the technical scheme of the shimming joint simulation method provided by the embodiment of the invention, initial simulation data generated by simulation software executing electromagnetic simulation operation based on initial configuration data is obtained; carrying out shimming analysis on the initial simulation data to obtain target amplitude-phase data, and sending the target amplitude-phase data to simulation software; acquiring power loss density distribution data corresponding to the target amplitude-phase data determined by simulation software, and determining specific absorption rate data corresponding to the power loss density distribution data; and if the specific absorption rate data is larger than or equal to the preset threshold value, generating current amplitude-phase data based on a preset iteration interval by taking the target amplitude-phase data as a starting point, controlling the simulation software to execute electromagnetic simulation operation again based on the current amplitude-phase data to obtain current initial simulation data, and returning to the step of performing shimming analysis on the initial simulation data to obtain the target amplitude-phase data. The electromagnetic simulation software is called and controlled in an external programming environment, the complete operation flow of direct calling of a simulation result and shimming analysis is realized, manual intervention is reduced, post-processing of electromagnetic simulation is automated, radio frequency safety is fully verified after shimming of simulation, the result is ensured to meet international universal safety standards, and the automatic batch processing efficiency of shimming simulation is remarkably improved while the safety and usability of the radio frequency are ensured.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a flowchart of shimming joint simulation provided in an embodiment of the present invention;
fig. 2 is a structural block diagram of a shimming joint simulation apparatus provided in the second embodiment of the present invention;
fig. 3 is a block diagram of an electronic device according to a third embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described through embodiments with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
Fig. 1 is a flowchart of a shimming joint simulation method according to an embodiment of the present invention. The technical scheme of the embodiment is suitable for realizing automation of shimming simulation on the premise of ensuring radio frequency safety by calling simulation software. The shimming joint simulation device provided by the embodiment of the invention can be used for executing the shimming joint simulation device, is arranged in an external programming environment, can be realized in a software and/or hardware mode, and is configured to be applied in a processor of an electronic device. The external programming environment may be programming software such as Matlab, python, etc.
The method specifically comprises the following steps:
s101, acquiring initial simulation data generated by the simulation software executing electromagnetic simulation operation based on the initial configuration data, wherein the initial configuration data comprises initial amplitude-phase data of each transmitting channel of the radio frequency transmitting coil.
The Simulation software is conventional electromagnetic numerical Simulation software, such as CST (Computer Simulation Technology, CST Microwave Studio), HFSS (High Frequency Structure Simulator), and the like.
It will be appreciated that the initial simulation data is the result of an electromagnetic simulation corresponding to the initial configuration data.
In one embodiment, the initial simulation data is transmitted field distribution data in a circularly polarized mode.
In one embodiment, a communication connection between an external programming environment and simulation software is established, and in the external programming environment, initial configuration data is assigned to each transmitting channel of a radio frequency transmitting coil in the simulation software; controlling simulation software to execute electromagnetic simulation operation based on the initial configuration data to generate initial simulation data, and sending the initial simulation data to a first preset storage position; and when detecting that the simulation software finishes the electromagnetic simulation operation, reading initial simulation data from a first preset storage position. In this embodiment, when electromagnetic simulation is required, simulation software is used to perform electromagnetic simulation, and the simulation software sends a simulation result to a first preset storage location of an external programming environment.
In one embodiment, a bridge between the simulation software and the external programming environment is established through the interface component, so that the electromagnetic simulation software is externally called as a function, and the automatic post-processing of the simulation result is realized. The interface Component is a communication interface Component configured by emulation software, such as a COM (Component Object Model) Component. In practical use, a result synthesizer in simulation software is called through a pre-created interface pointer to perform electromagnetic simulation calculation on initial configuration data so as to generate initial simulation data corresponding to the initial configuration data.
Taking simulation of an 8-channel radio frequency coil with a human body model as a load as an example, a result synthesizer in an electromagnetic calculation template under a post-processing module of simulation software is called in an external programming environment, and initial configuration data is set. Illustratively, the initial configuration data includes the identity, amplitude and phase of each transmit channel of the radio frequency transmit coil in the format of (N, I and θ), where N is the transmit channel identity, I is the amplitude and θ is the phase. For example, the configuration data of each channel value in the circular polarization mode are (1, 1, 0), (2, 1, 45), (3, 1, 90), (4, 1, 135), (5, 1, 120), (6, 1, 225), (7, 1, 270), and (8, 1, 315), respectively. The result synthesizer synthesizes the electromagnetic field of each channel according to the circular polarization mode based on the electromagnetic numerical simulation function. When the external programming environment detects electromagnetic field synthesis, a result processor in simulation software is called, parameters such as an export object, a step length, an x-y-z direction range, a file name and the like and a storage path are set, and emission field distribution under 8 channels and a circular polarization mode is exported in sequence at a z =0 plane and other human abdomen cross sections, so that exported data exist in a first preset storage position corresponding to the storage path.
And S102, carrying out shimming analysis on the initial simulation data to obtain target amplitude-phase data, and sending the target amplitude-phase data to the simulation software.
In a high-field magnetic resonance system, a radio-frequency shimming method is mainly used for compensating an area with over-strong or over-weak magnetic field by acquiring the sensitivity of each channel and utilizing the independently controllable characteristic of each channel under the condition of not changing the original sequence time sequence and adjusting the amplitude and the phase of each channel so as to obtain a more uniform excitation magnetic field in the whole area.
The radio frequency shimming algorithm includes, but is not limited to, an interior point method iteration, twice shimming and other methods.
It can be understood that the target amplitude-phase data corresponds to a radio frequency shimming distribution, i.e. the transmission field distribution obtained by performing electromagnetic simulation based on the target amplitude-phase data is uniform.
And reading initial simulation data at a first preset storage position by an external programming environment, displaying the transmission field distribution in the circular polarization mode, and taking the transmission field distribution as a reference. And manually selecting the region of interest, and calling a constraint minimization tool in an optimization tool box in an external programming environment, so that the constraint minimization tool finds the amplitude-phase optimal solution of each transmitting channel through amplitude-phase data iteration. Wherein the objective function of the constraint minimization tool includes a data fitting portion and a regularization portion to prevent overfitting. The range of iteration for the amplitude data is (1, 2) and the range of iteration for the phase data is (-pi, pi). And after the target function is converged, the constraint minimization tool controls the iteration to be finished, returns a group of optimal amplitude data and phase data, namely target amplitude-phase data, and displays the corresponding transmitting field distribution of the target amplitude-phase data. The transmit field distribution is a radio frequency shimming distribution.
S103, power loss density distribution data corresponding to the target amplitude-phase data determined by the simulation software are obtained, and specific absorption rate data corresponding to the power loss density distribution data are determined.
In Magnetic Resonance Imaging (MRI), a radio frequency excitation pulse for exciting proton precession includes two major components, an electric field and a Magnetic field, wherein the electric field causes power deposition to cause tissue heat generation, and a Specific Absorption Rate (SAR) is used as a Magnetic Resonance safety index to evaluate the Magnetic Resonance Imaging (MRI) internationally. The embodiment takes the specific absorption rate as a constraint condition to implement shimming analysis, and verifies the radio frequency safety performance during optimal shimming.
In one embodiment, in an external programming environment, a result synthesizer of an electromagnetic computation template under a simulation software post-processing module is called, and target amplitude-phase data is assigned to each transmission channel in the result synthesizer, so that the result synthesizer synthesizes power loss density distribution according to the target amplitude-phase data. After the power loss density distribution is detected to be generated, an SAR value calculator under a simulation software post-processing module is called, the calculation type is set to be 10g SAR (local SAR), the calculated object is the synthesized power loss density distribution, and the SAR distribution of the human body model corresponding to the radio-frequency shimming distribution is finally obtained. It will be appreciated that a global SAR value can be determined from the SAR distribution, and the global SAR value and the local SAR value can be stored in a second predetermined memory location in the external programming environment.
And S104, if the specific absorption rate data is larger than or equal to a preset threshold value, generating current amplitude-phase data based on a preset iteration interval by taking the target amplitude-phase data as a starting point, controlling the simulation software to execute electromagnetic simulation operation again based on the current amplitude-phase data to obtain current initial simulation data, and returning to the step of performing shimming analysis on the initial simulation data to obtain the target amplitude-phase data.
The external programming environment reads the specific absorption rate data stored in the second preset storage position, judges the size relationship between the specific absorption rate data and a preset threshold value, if the specific absorption rate data is larger than or equal to the preset threshold value, the radio frequency shimming distribution corresponding to target amplitude-phase data cannot meet radio frequency safety requirements and cannot be used for clinic, generates current amplitude-phase data based on a preset iteration interval by taking the target amplitude-phase data as a starting point, assigns the current amplitude-phase data to each channel of a radio frequency transmitting coil in the simulation software, controls the simulation software to execute electromagnetic simulation operation again based on the current amplitude-phase data to obtain current initial simulation data, sends the initial simulation data to a first preset storage position in the external programming environment, and the external programming software reads the initial simulation data from the first preset storage position, and performing shimming analysis on the initial simulation data, namely, after the external programming environment reads the initial simulation data from the first preset storage position, returning to S102.
The amplitude and phase data comprise amplitude data and phase data, the iteration range of the amplitude data is (1, 2), and the iteration range of the phase data is (-pi, pi).
It will be appreciated that if the specific absorption rate data is less than the preset threshold, it indicates that the radio frequency shimming distribution corresponding to the current target amplitude-phase data meets the radio frequency safety requirements, and is clinically applicable, and therefore the radio frequency shimming distribution is output. Wherein the radio frequency shim distribution comprises electromagnetic field distribution data and target amplitude and phase data.
Wherein the specific absorption rate data comprises a global SAR value and a local SAR value. It can be understood that, only when the global SAR value and the local SAR value are both smaller than the corresponding preset threshold, it is indicated that the radio frequency shimming distribution corresponding to the current target amplitude-phase data meets the radio frequency safety requirement, and the method can be used clinically.
According to the technical scheme of the shimming joint simulation method provided by the embodiment of the invention, initial simulation data generated by simulation software executing electromagnetic simulation operation based on initial configuration data is obtained; carrying out shimming analysis on the initial simulation data to obtain target amplitude-phase data, and sending the target amplitude-phase data to simulation software; acquiring power loss density distribution data corresponding to the target amplitude-phase data determined by simulation software, and determining specific absorption rate data corresponding to the power loss density distribution data; and if the specific absorption rate data is larger than or equal to the preset threshold value, generating current amplitude-phase data based on a preset iteration interval by taking the target amplitude-phase data as a starting point, controlling the simulation software to execute electromagnetic simulation operation again based on the current amplitude-phase data to obtain current initial simulation data, and returning to the step of performing shimming analysis on the initial simulation data to obtain the target amplitude-phase data. The electromagnetic simulation software is called and controlled in an external programming environment, the complete operation flow of direct calling of a simulation result and shimming analysis is realized, manual intervention is reduced, post-processing of electromagnetic simulation is automated, radio frequency safety is fully verified after shimming of simulation, the result is ensured to accord with international universal safety standards, and automatic batch processing efficiency and radio frequency safety availability of shimming simulation are remarkably improved.
Example two
Fig. 2 is a structural block diagram of a shimming joint simulation apparatus provided in an embodiment of the present invention. The device is used for executing the shimming joint simulation method provided by any of the above embodiments, and the device can be implemented by software or hardware. The device includes:
the initial simulation data acquisition module 11 is configured to acquire initial simulation data generated by the simulation software executing the electromagnetic simulation operation based on initial configuration data, where the initial configuration data includes initial amplitude-phase data of each transmission channel of the radio frequency transmission coil;
the shimming analysis module 12 is configured to perform shimming analysis on the initial simulation data to obtain target amplitude-phase data, and send the target amplitude-phase data to the simulation software;
a power loss density distribution data obtaining module 13, configured to obtain power loss density distribution data corresponding to the target amplitude-phase data determined by the simulation software, and determine specific absorption rate data corresponding to the power loss density distribution data;
the radio frequency safety verification module 14 is configured to, if the specific absorption rate data is greater than or equal to a preset threshold, generate current amplitude-phase data based on a preset iteration interval with the target amplitude-phase data as a starting point, control the simulation software to perform an electromagnetic simulation operation again based on the current amplitude-phase data to obtain current initial simulation data, and return to the step of performing shimming analysis on the initial simulation data to obtain the target amplitude-phase data.
Optionally, the apparatus further comprises:
an output module for outputting a radio frequency shimming distribution if the specific absorption rate data is less than a preset threshold.
Optionally, the initial simulation data acquisition module is configured to establish a communication connection with the simulation software; assigning initial configuration data to each transmitting channel of a radio frequency transmitting coil in the simulation software; controlling the simulation software to execute electromagnetic simulation operation based on the initial configuration data to generate initial simulation data, and sending the initial simulation data to a first preset storage position; and when the simulation software is detected to finish the electromagnetic simulation operation, reading the initial simulation data from the first preset storage position.
Optionally, the initial simulation data obtaining module is configured to invoke a result synthesizer in the simulation software through a pre-created interface pointer to perform electromagnetic simulation calculation on the initial configuration data, so as to generate initial simulation data corresponding to the initial configuration data.
Optionally, the specific absorption rate data comprises a global SAR value and a local SAR value.
Optionally, the amplitude and phase data includes amplitude data and phase data, the iteration range of the amplitude data is (1, 2), and the iteration range of the phase data is (-pi, pi).
Optionally, the initial simulation data is transmitted field distribution data in a circular polarization mode.
According to the technical scheme of the shimming joint simulation device provided by the embodiment of the invention, the initial simulation data generated by the simulation software executing the electromagnetic simulation operation based on the initial configuration data is obtained through the initial simulation data obtaining module, the shimming analysis module is used for carrying out shimming analysis on the initial simulation data to obtain target amplitude-phase data, and the target amplitude-phase data is sent to the simulation software; acquiring power loss density distribution data corresponding to target amplitude-phase data determined by simulation software through a power loss density distribution data acquisition module, and determining specific absorption rate data corresponding to the power loss density distribution data; when the specific absorption rate data is larger than or equal to a preset threshold value, the radio frequency safety verification module generates current amplitude-phase data based on a preset iteration interval by taking the target amplitude-phase data as a starting point, controls simulation software to execute electromagnetic simulation operation again based on the current amplitude-phase data to obtain current initial simulation data, and returns to the step of performing shimming analysis on the initial simulation data to obtain the target amplitude-phase data. The electromagnetic simulation software is called and controlled in an external programming environment, the complete operation flow of direct calling of a simulation result and shimming analysis is realized, manual intervention is reduced, the post-processing of electromagnetic simulation is automated, the radio frequency safety is fully verified after the shimming of the simulation, the result is ensured to accord with the international universal safety standard, and the automatic batch processing efficiency of shimming simulation is obviously improved on the premise of ensuring the safety and usability of the radio frequency.
The shimming joint simulation device provided by the embodiment of the invention can execute the shimming joint simulation method provided by any embodiment of the invention, and has corresponding functional modules and beneficial effects of the execution method.
EXAMPLE III
Fig. 3 is a schematic structural diagram of an electronic apparatus according to an embodiment of the present invention, as shown in fig. 3, the electronic apparatus includes a processor 201, a memory 202, an input device 203, and an output device 204; the number of the processors 201 in the device may be one or more, and one processor 201 is taken as an example in fig. 3; the processor 201, the memory 202, the input device 203 and the output device 204 in the apparatus may be connected by a bus or other means, and fig. 3 illustrates the connection by a bus as an example.
The memory 202, as a computer-readable storage medium, may be used for storing software programs, computer-executable programs, and modules, such as program instructions/modules corresponding to the shimming joint simulation method in the embodiment of the present invention (for example, the initial simulation data acquisition module 11, the shimming analysis module 12, the power loss density distribution data acquisition module 13, and the radio frequency security verification module 14). The processor 201 executes various functional applications of the device and data processing by running software programs, instructions and modules stored in the memory 202, i.e. implements the shimming joint simulation method described above.
The memory 202 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created according to the use of the terminal, and the like. Further, the memory 202 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some examples, the memory 202 may further include memory located remotely from the processor 201, which may be connected to the device over a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The input device 203 may be used to receive input numeric or character information and generate key signal inputs related to user settings and function controls of the apparatus.
The output device 204 may include a display device such as a display screen, for example, of a user terminal.
Example four
Embodiments of the present invention also provide a storage medium containing computer-executable instructions, which when executed by a computer processor, are configured to perform a shimming joint simulation method, the method including:
acquiring initial simulation data generated by simulation software executing electromagnetic simulation operation based on initial configuration data, wherein the initial configuration data comprises initial amplitude-phase data of each transmitting channel of a radio frequency transmitting coil;
shimming analysis is carried out on the initial simulation data to obtain target amplitude-phase data, and the target amplitude-phase data is sent to the simulation software;
acquiring power loss density distribution data corresponding to the target amplitude-phase data determined by the simulation software, and determining specific absorption rate data corresponding to the power loss density distribution data;
and if the specific absorption rate data is larger than or equal to a preset threshold value, generating current amplitude and phase data based on a preset iteration interval by taking the target amplitude and phase data as a starting point, controlling the simulation software to execute electromagnetic simulation operation again based on the current amplitude and phase data to obtain current initial simulation data, and returning to the step of performing shimming analysis on the initial simulation data to obtain the target amplitude and phase data.
Of course, the storage medium provided by the embodiment of the present invention contains computer executable instructions, and the computer executable instructions are not limited to the method operations described above, and may also perform related operations in the shimming joint simulation method provided by any embodiment of the present invention.
From the above description of the embodiments, it is obvious for those skilled in the art that the present invention can be implemented by software and necessary general hardware, and certainly, can also be implemented by hardware, but the former is a better embodiment in many cases. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, where the computer software product may be stored in a computer-readable storage medium, such as a floppy disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a FLASH Memory (FLASH), a hard disk or an optical disk of a computer, and the like, and includes several instructions to enable a computer device (which may be a personal computer, a server, or a network device, and the like) to execute the shimming joint simulation method according to the embodiments of the present invention.
It should be noted that, in the embodiment of the shimming joint simulation apparatus, the units and modules included in the embodiment are only divided according to functional logic, but are not limited to the above division as long as the corresponding functions can be realized; in addition, specific names of the functional units are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present invention.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A shimming joint simulation method is characterized by comprising the following steps:
acquiring initial simulation data generated by simulation software executing electromagnetic simulation operation based on initial configuration data, wherein the initial configuration data comprises initial amplitude-phase data of each transmitting channel of a radio frequency transmitting coil;
shimming analysis is carried out on the initial simulation data to obtain target amplitude-phase data, and the target amplitude-phase data is sent to the simulation software;
acquiring power loss density distribution data corresponding to the target amplitude-phase data determined by the simulation software, and determining specific absorption rate data corresponding to the power loss density distribution data;
and if the specific absorption rate data is larger than or equal to a preset threshold value, generating current amplitude and phase data based on a preset iteration interval by taking the target amplitude and phase data as a starting point, controlling the simulation software to execute electromagnetic simulation operation again based on the current amplitude and phase data to obtain current initial simulation data, and returning to the step of performing shimming analysis on the initial simulation data to obtain the target amplitude and phase data.
2. The method of claim 1, further comprising:
outputting a radio frequency shimming distribution if the specific absorption rate data is less than a preset threshold.
3. The method of claim 1, wherein obtaining initial simulation data generated by the simulation software performing the electromagnetic simulation operation based on the initial configuration data comprises:
establishing communication connection with simulation software;
assigning initial configuration data to each transmitting channel of a radio frequency transmitting coil in the simulation software;
controlling the simulation software to execute electromagnetic simulation operation based on the initial configuration data to generate initial simulation data, and sending the initial simulation data to a first preset storage position;
and when the simulation software is detected to finish the electromagnetic simulation operation, reading the initial simulation data from the first preset storage position.
4. The method of claim 3, wherein said controlling said simulation software to perform electromagnetic simulation operations based on said initial configuration data to generate initial simulation data comprises:
and calling a result synthesizer in simulation software through a pre-created interface pointer to perform electromagnetic simulation calculation on the initial configuration data so as to generate initial simulation data corresponding to the initial configuration data.
5. The method of claim 1, wherein the specific absorption rate data comprises a global SAR value and a local SAR value.
6. The method of claim 1, wherein the magnitude and phase data comprises magnitude data and phase data, the magnitude data having an iteration range of (1, 2), and the phase data having an iteration range of (-pi, pi).
7. The method of any of claims 1-6, wherein the initial simulation data is transmit field distribution data in a circularly polarized mode.
8. A shimming joint simulation device is characterized by comprising:
the system comprises an initial simulation data acquisition module, a data processing module and a data processing module, wherein the initial simulation data acquisition module is used for acquiring initial simulation data generated by simulation software executing electromagnetic simulation operation based on initial configuration data, and the initial configuration data comprises initial amplitude-phase data of each transmitting channel of a radio frequency transmitting coil;
the shimming analysis module is used for carrying out shimming analysis on the initial simulation data to obtain target amplitude-phase data and sending the target amplitude-phase data to the simulation software;
a power loss density distribution data acquisition module, configured to acquire power loss density distribution data corresponding to the target amplitude-phase data determined by the simulation software, and determine specific absorption rate data corresponding to the power loss density distribution data;
and the radio frequency safety verification module is used for generating current amplitude-phase data based on a preset iteration interval by taking the target amplitude-phase data as a starting point if the specific absorption rate data is greater than or equal to a preset threshold, controlling the simulation software to execute electromagnetic simulation operation again based on the current amplitude-phase data to obtain current initial simulation data, and returning to the step of performing shimming analysis on the initial simulation data to obtain the target amplitude-phase data.
9. An electronic device, characterized in that the electronic device comprises:
one or more processors;
storage means for storing one or more programs;
when executed by the one or more processors, cause the one or more processors to implement the shimming co-simulation method of any of claims 1-7.
10. A storage medium containing computer executable instructions for performing the shimming joint simulation method according to any of claims 1-7 when executed by a computer processor.
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| CN202210297834.8A CN114398803B (en) | 2022-03-25 | 2022-03-25 | Shimming joint simulation method and device, electronic equipment and storage medium |
| PCT/CN2022/098083 WO2023178843A1 (en) | 2022-03-25 | 2022-06-10 | Shimming joint simulation method and apparatus, electronic device, and storage medium |
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| CN202210297834.8A CN114398803B (en) | 2022-03-25 | 2022-03-25 | Shimming joint simulation method and device, electronic equipment and storage medium |
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Cited By (3)
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| CN115438623A (en) * | 2022-11-07 | 2022-12-06 | 中国科学技术大学先进技术研究院 | Method, device and equipment for synthesizing magnetic field of multichannel magnetic resonance coil and storage medium |
| WO2023178843A1 (en) * | 2022-03-25 | 2023-09-28 | 中国科学院深圳先进技术研究院 | Shimming joint simulation method and apparatus, electronic device, and storage medium |
| CN117494532A (en) * | 2024-01-02 | 2024-02-02 | 航天精工股份有限公司 | Automatic finite element pretightening force data batch transmission and simulation calculation control method |
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| CN117494532B (en) * | 2024-01-02 | 2024-04-16 | 航天精工股份有限公司 | Automatic finite element pretightening force data batch transmission and simulation calculation control method |
Also Published As
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| CN114398803B (en) | 2022-07-12 |
| WO2023178843A1 (en) | 2023-09-28 |
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