File(s) under permanent embargo
Minimum maximum temperature gradient coil design
journal contribution
posted on 2023-05-17, 19:18 authored by While, PT, Poole, MS, Lawrence ForbesLawrence Forbes, Crozier, SOhmic heating is a serious problem in gradient coil operation. A method is presented for redesigning cylindrical gradient coils to operate at minimum peak temperature, while maintaining field homogeneity and coil performance. To generate these minimaxT coil windings, an existing analytic method for simulating the spatial temperature distribution of single layer gradient coils is combined with a minimax optimization routine based on sequential quadratic programming. Simulations are provided for symmetric and asymmetric gradient coils that show considerable improvements in reducing maximum temperature over existing methods. The winding patterns of the minimaxT coils were found to be heavily dependent on the assumed thermal material properties and generally display an interesting "fish-eye" spreading of windings in the dense regions of the coil. Small prototype coils were constructed and tested for experimental validation and these demonstrate that with a reasonable estimate of material properties, thermal performance can be improved considerably with negligible change to the field error or standard figures of merit.
History
Publication title
Magnetic Resonance in MedicineVolume
70Pagination
584-594ISSN
0740-3194Department/School
School of Natural SciencesPublisher
John Wiley & Sons IncPlace of publication
111 River St, Hoboken, USA, NJ, 07030Rights statement
Copyright 2012 Wiley Periodicals.Repository Status
- Restricted