Gradient eddy current detection and compensation device and method based on inductance coil
A technology of eddy current detection and inductance coils, which is applied in the field of electronic information, can solve the problems of large error in the winding accuracy of sensor coils, and achieve the effects of low cost, good compensation results, and high stability
Active Publication Date: 2021-03-09
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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This method also has the problem of relatively large error in the winding accuracy of the sensor coil.
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[0036] In order to facilitate those skilled in the art to understand the technical content of the present invention, the content of the present invention will be further explained below in conjunction with the accompanying drawings.
[0037] Comprehensively considering the advantages and disadvantages of various eddy current compensation methods, the present invention adopts a compensation method based on the gradient measurement of the inductance coil. The specific principle of this method is to measure the actual gradient waveform, such as figure 1 As shown, comparing the actual gradient field with the ideal gradient field can be obtained as figure 1 The eddy current attenuation curve shown in the middle shaded part, and then the eddy current attenuation curve obtained by comparison is superimposed on the ideal gradient waveform to form a gradient "overcurrent";
[0038] Because the eddy current effect of the metal parts around the gradient coil always exists, the gradient w...
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The invention discloses a gradient eddy current detection and compensation device and method based on an inductance coil, which are applied to the technical field of electronic information and aim atsolving the problem of large eddy current detection precision error in the prior art.The inductance coil is improved by adopting a modern printed circuit board technology; According to the coil designed and manufactured through the PCB technology, it can be guaranteed that parameters such as the wire diameter of the coil, the winding width, the wire distance and the number of wound coils are accurate and controllable, and the defects that a traditional mechanical wound coil is large in size and poor in consistency are overcome.According to the invention, the gradient eddy current is detected by using the inductance coil method implemented by the PCB; The magnitude of an actual gradient magnetic field generated under the control of a gradient waveform generator is measured, then a measuredvalue of the gradient magnetic field is compared with a theoretical value, and the magnitude of overcurrent needing to be subjected to gradient waveform pre-emphasis is calculated.
Description
technical field [0001] The invention belongs to the technical field of electronic information, in particular to an eddy current detection method and device. Background technique [0002] In the magnetic resonance imaging (magnetic resonance imaging, MRI) system, in order to obtain a complete magnetic resonance image of human tissue, it is necessary to spatially locate each part of the subject's body. The phase encoding gradient is realized by three gradient magnetic fields. The gradient magnetic field is generated by applying current to the gradient coil, but the changing gradient field generated by the rapidly switching current when the gradient coil is working will cause the metal parts around it to produce an eddy current (Eddy Current) effect. This eddy current decays with an e-exponential function that approximates multiple time constants (the time constant can reach several s), which will seriously deform the gradient waveform. From the perspective of magnetic resona...
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Login to View More IPC IPC(8): G01R33/3875A61B5/055
CPCA61B5/055G01R33/3875
Inventor 吴林张涛胡霞飞解玺洁余洁
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA