Method for accurately positioning center of gradient field of MRI (Magnetic Resonance Imaging) system
A precise positioning and gradient field technology, applied in the direction of measuring magnetic variables, measuring devices, instruments, etc., can solve the problems of lack of accurate and effective magnetic field center positioning methods
Active Publication Date: 2015-12-16
HOHAI UNIV
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[0003] In order to solve the deficiencies of the prior art, the purpose of the present invention is to provide a method for accurately locating the center of the gradient field in an MRI system, so as to solve the problem of lacking an accurate and effective method for locating the center of the magnetic field in the prior art
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[0029] Below in conjunction with accompanying drawing and specific embodiment, further illustrate the present invention, should be understood that these embodiments are only for illustrating the present invention and are not intended to limit the scope of the present invention, after having read the present invention, those skilled in the art will understand various aspects of the present invention Modifications in equivalent forms all fall within the scope defined by the appended claims of this application.
[0030] This application is supported by the Youth Fund Project of the Natural Science Foundation of Jiangsu Province (Project Approval No.: BK20130854).
[0031] This embodiment uses the gradient magnetic field generated by the gradient coil in the superconducting MRI system in the ellipsoidal imaging space as an example to illustrate the method for accurately locating the center of the gradient field in the present invention. The spatial distribution of several core com...
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The invention discloses a method for accurately positioning the center of a gradient field of a MRI (Magnetic Resonance Imaging) system. The method comprises steps of preliminarily determining the center of an initial gradient field according to the gradient coil structure, and arranging multiple measurement sampling points around the center as the origin of coordinates; measuring the background magnetic field of each sampling point; measuring the magnetic field of each sampling point when direct current flows through each of three gradient coils; performing linear fitting of real magnetic field data generated by the gradient coils; and determining a new magnetic field center according to fitting results, and determining whether to continue testing or not. The invention performs fitting according to measurement data to find the position of the center of the gradient field, and can position the center of the gradient coils more accurately compared with the traditional method using mechanical positioning, and has high precision.
Description
technical field [0001] The invention relates to a method for locating the center of a magnetic field, in particular to a method for precisely locating the center of a gradient magnetic field generated by a gradient coil in a nuclear magnetic resonance imaging system. The invention belongs to the field of research and development of nuclear magnetic resonance imaging system components. Background technique [0002] The magnetic fields in MRI include the static magnetic field generated by the main magnet, the gradient magnetic field generated by the gradient coil, and the radio frequency field generated by the radio frequency coil. Objects can only produce MRI images under the joint action of the three fields. In principle, when an MRI system is assembled, it is required that the magnetic field centers of the three components coincide with each other. And when scanning, the object should be placed in the center of the magnetic field as much as possible. If the actual imagin...
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IPC IPC(8): G01R33/385
Inventor 平学伟朱紫辉殷兴辉李黎李昌利陈嘉琪
Owner HOHAI UNIV