Gradient coil design method in nuclear magnetic resonance system
A gradient coil and nuclear magnetic resonance technology is applied in the field of superconductivity to achieve the effects of easy engineering processing, good linearity and high coil efficiency
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[0049]Step (1), input the preset conditions to the computer, including the radius of the main coil and the shielding coil, the wiring length, the expansion order of the current density, the expansion order of the target field and the shielding field, the disturbance range of the target field and the gradient field, and the shielding field test Dot radius, minimum wiring spacing, target gradient strength, gradient linear region diameter.
[0050] Step (2), calculating the target field coefficient matrix D inside the gradient coil, the method is as follows:
[0051] In the spherical coordinate system, define the field point Source The radius of the coil is a and the length is L. The current is distributed on a cylindrical surface with radius a, expressed as
[0052] According to Pizza's theorem:
[0053] dB = μ 0 4 π ▿ 1 | ...
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