Actively shielded multi-layer gradient coil designs with improved cooling properties

Leggett, J., Crozier, S. and Bowtell, R. W. (2003) Actively shielded multi-layer gradient coil designs with improved cooling properties. Journal of Magnetic Resonance, 165 2: 196-207. doi:10.1016/j.jmr.2003.08.002


Author Leggett, J.
Crozier, S.
Bowtell, R. W.
Title Actively shielded multi-layer gradient coil designs with improved cooling properties
Journal name Journal of Magnetic Resonance   Check publisher's open access policy
ISSN 1090-7807
Publication date 2003-12
Sub-type Article (original research)
DOI 10.1016/j.jmr.2003.08.002
Volume 165
Issue 2
Start page 196
End page 207
Total pages 12
Editor S. Opella
Place of publication Orlando, Florida
Publisher Academic Press
Collection year 2003
Language eng
Subject C1
090399 Biomedical Engineering not elsewhere classified
Abstract In standard cylindrical gradient coils consisting of a single layer of wires, a limiting factor in achieving very large magnetic field gradients is the rapid increase in coil resistance with efficiency. This is a particular problem in small-bore scanners, such as those used for MR microscopy. By adopting a multi-layer design in which the coil wires are allowed to spread out into multiple layers wound at increasing radii, a more favourable scaling of resistance with efficiency is achieved, thus allowing the design of more powerful gradient coils with acceptable resistance values. Previously this approach has been applied to the design of unshielded, longitudinal, and transverse gradient coils. Here, the multi-layer approach has been extended to allow the design of actively shielded multi-layer gradient coils, and also to produce coils exhibiting enhanced cooling characteristics. An iterative approach to modelling the steady-state temperature distribution within the coil has also been developed. Results indicate that a good level of screening can be achieved in multi-layer coils, that small versions of such coils can yield higher efficiencies at fixed resistance than conventional two-layer (primary and screen) coils, and that performance improves as the number of layers of increases. Simulations show that by optimising multi-layer coils for cooling it is possible to achieve significantly higher gradient strengths at a fixed maximum operating temperature. A four-layer coil of 8 mm inner diameter has been constructed and used to test the steady-state temperature model. (C) 2003 Elsevier Inc. All rights reserved.
Keyword Biochemical Research Methods
Physics, Atomic, Molecular & Chemical
Spectroscopy
Gradient Coil
Shielding
High Efficiency
Nmr Microscopy
Cooling
Q-Index Code C1

 
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