Magnetic resonance image-forming system gradient field spherical harmonic coefficient obtaining method
A technology of magnetic resonance imaging and spherical harmonic coefficient, which is used in image data processing, image enhancement, measurement of magnetic variables, etc.
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[0039] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.
[0040] The acquisition method of the spherical harmonic coefficient of the gradient field of the magnetic resonance imaging system provided by the present invention is based on taking limited points in the actual image space, and inversely calculating the magnetic resonance correction parameter, that is, the spherical harmonic coefficient, for the sake of calculation amount and correction accuracy Comprehensive consideration, only the calculation of parameters below the 5th order is carried out.
[0041] As shown in Figures 1 and 2, the gradient correction water model is a tool for gradient correction, which is used not only to search for system parameters, but also to measure the corrected error. The gradient correction water model is a square box body 1, and cylinders 2 arranged in a square array at equal intervals are arranged in the box body 1, an...
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