High-Homogeneity NMR and MRI Magnets With Minimized Fringe Field

This paper demonstrates the capabilities of a computer program to design magnets with exquisite field homogeneity and minimal fringe field. The program adjusts magnet parameters to reduce (typically to zero) selected coefficients cn in the power series expansion B z (z) = Σc n z n , with n ranging f...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 2014-06, Vol.24 (3), p.1-4
Main Authors: Weggel, Robert J., Weggel, Carl F.
Format: Article
Language:English
Subjects:
Adjustment
Applied sciences
C (programming language)
Coils
Computer programs
Differentiation
Electrical engineering. Electrical power engineering
Electromagnetic compatibility
Electromagnets
Exact sciences and technology
Homogeneity
Information, signal and communications theory
Least squares method
Magnetic analysis
Magnetic moments
Magnetic noise
Magnetic resonance imaging
Magnetic shielding
Magnets
Newton method
nuclear magnetic resonance
occupational safety
Superconducting magnets
Superconductivity
Syntax
Telecommunications and information theory
Various equipment and components
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Summary:This paper demonstrates the capabilities of a computer program to design magnets with exquisite field homogeneity and minimal fringe field. The program adjusts magnet parameters to reduce (typically to zero) selected coefficients cn in the power series expansion B z (z) = Σc n z n , with n ranging from -21 to +16 ( n ≠ - 2 or -1) and c n evaluated by multiple differentiations of the on-axis field of a solenoid. Presented are illustrative MRI magnets of 1-m I.D. with field homogeneity of 12th order and fringe field annulled through order as high as 21st. ΔB/B(0) is 0.1-0.2 ppm within a 30-cm sphere. The volume of the OSHA "hazard zone" (|B| > 5 is as little as 0.5% that of an uncompensated magnet.
ISSN:1051-8223
1558-2515
DOI:10.1109/TASC.2013.2283422