A method, device, equipment and storage medium for determining magnetic resonance passive shimming
A magnetic resonance and shimming technology, applied in the field of electromagnetic scanning, can solve the problem of high overall uniformity of the magnetic field
Active Publication Date: 2019-11-01
SHANDONG AOXIN MEDICAL TECH CO LTD
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[0004] The purpose of the present invention is to provide a method, device, equipment and storage medium for determining passive shimming of magnetic resonance, so as to solve the problem of high overall uniformity of the magnetic field in the prior art
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[0052] The core of the present invention is to provide a method for determining passive shimming of magnetic resonance, and a schematic flow chart of a specific implementation thereof is as follows figure 2 As shown, it is called the first specific implementation mode, including:
[0053] Step S101: Obtain the magnetic field data in the cavity before shims are installed as initial field data, and obtain target field data.
[0054] The above target field data is the data of the desired ideal magnetic field.
[0055] Furthermore, after the above-mentioned acquisition of the magnetic field data in the cavity before the shims are set as the initial field data, it also includes:
[0056] Perform deconvolution processing on the above initial field data;
[0057] The above determination of the minimum value of the loss function through the above initial field data also includes:
[0058] The minimum value of the loss function is determined by the initial field data subjected to t...
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The invention discloses a method for determining magnetic resonance passive shimming, which comprises the steps of acquiring magnetic field data in a cavity before the setting of a shimming piece to serve as initial field data, and acquiring target field data; determining the minimum value of a loss function according to the initial field data, wherein the loss function is a function for determining the difference between the target field and an adjustment field after the setting of the shimming piece, and the loss function satisfies harmonic analysis based constraints and target field analysis based constraints; determining the thickness of the shimming piece and spatial arrangement of the shimming piece according to adjustment field data when the loss function is the minimum. The methodintegrates the harmonic component based constraints and the target field based constraints, mixes two methods of harmonic components and the target field, enables the advantages and disadvantages to complement each other, and obtains the adjustment field closer to the target field. The invention further provides a device and equipment for determining the magnetic resonance passive shimming and a computer storage medium with the above beneficial effects.
Description
technical field [0001] The invention relates to the field of electromagnetic scanning, in particular to a method, device, equipment and storage medium for determining magnetic resonance passive shimming. Background technique [0002] Magnetic resonance imaging technology has gradually become an indispensable part of the hospital imaging department due to its superior ability to distinguish soft tissues and its low harm to the human body. The medical superconducting MRI (1.5 or 3T) has obvious advantages over the traditional permanent magnet MRI in terms of signal-to-noise ratio, resolution and imaging speed. One of the difficulties in the design of superconducting magnetic resonance lies in the requirement of high magnetic field uniformity, and the peak-to-peak value should be lower than 10ppm (one millionth). However, due to some uncertain factors or errors, the uniformity of the initial field is about 400-600ppm, so it is necessary to further optimize the initial field, t...
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IPC IPC(8): G01R33/3873A61B5/055
Inventor 王兆连杨文辉李培勇张义廷刘宇陆瑶
Owner SHANDONG AOXIN MEDICAL TECH CO LTD