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Design of actively shielded main magnets: an improved functional method
Yu-Chung N Cheng1, Timothy P Eagan, Robert W Brown
1Department of Physics, Case Western Reserve University, 10900 Euclid Ave., Cleveland, OH 44106-7079, USA. yxc16@po.cwru.edu
Magma (New York, N.Y.)
|July 29, 2003
Summary
This study presents an improved functional approach for designing actively shielded magnetic resonance imaging (MRI) magnets. New designs offer enhanced shielding and shorter lengths, yielding high field homogeneity without superconducting shim coils.
Area of Science:
- Medical Imaging
- Magnet Design
- Applied Physics
Background:
- Designing magnetic resonance imaging (MRI) magnets with effective active shielding is crucial for achieving high-resolution imaging.
- Current methods often face limitations in balancing shielding efficiency, magnet length, and field homogeneity.
Purpose of the Study:
- To present an improved functional approach for designing MRI main magnets with active shielding.
- To develop new magnet designs offering enhanced shielding and potentially shorter lengths.
- To achieve desired field homogeneity without superconducting shim coils.
Main Methods:
- Utilizing a functional approach to design MRI magnets with active shielding.
- Nulling specific external and internal magnetic field moments.
- Employing contour plots of continuous current solutions for parameter optimization.
Main Results:
- New MRI magnet designs with improved active shielding and reduced lengths were obtained.
- The designs achieve the desired field homogeneity within the region of interest.
- The method does not require superconducting shim coils and uses modest computing power.
Conclusions:
- The improved functional approach enables the design of short, practical, actively shielded superconducting magnets.
- This method offers a computationally efficient way to achieve high field homogeneity in MRI magnets.
- The approach is applicable for designing magnets at any field strength.