Optimized Small-Bore, High-Pass Resonator Designs

Crozier S., Luescher K., Forbes L.K. and Doddrell D.M. (1995) Optimized Small-Bore, High-Pass Resonator Designs. Journal of Magnetic Resonance, Series B, 109 1: 1-11. doi:10.1006/jmrb.1995.1140


Author Crozier S.
Luescher K.
Forbes L.K.
Doddrell D.M.
Title Optimized Small-Bore, High-Pass Resonator Designs
Journal name Journal of Magnetic Resonance, Series B   Check publisher's open access policy
ISSN 1064-1866
Publication date 1995-01-01
Sub-type Article (original research)
DOI 10.1006/jmrb.1995.1140
Volume 109
Issue 1
Start page 1
End page 11
Total pages 11
Subject 2200 Engineering
Abstract The radiofrequency field homogeneity and quality factor (Q) of a number of high-pass resonator designs are compared theoretically and experimentally for small-bore coils. It was found that for high-pass resonators with the number of distributed capacitors greater than eight, a significant and unacceptable decrease in Q resulted. A number of schemes are proposed and investigated to improve the homogeneity of eight-capacitor high-pass resonators, thus balancing Q and homogeneity. These designs include variation in rung width, interrung feeding, a new hybrid coil design, and the use of internal guard rings. Eleven high-pass resonators were modeled and built to test the designs. The current density in each conductor was calculated using a novel numerical technique based on the inverse finite Hilbert transform which implicitly includes the effects of RF eddy currents. It was found that the effect of such eddy currents is important in coils of small geometry. RF fields were calculated from the current densities by using a retarded-potential solution to the free-space Maxwell equations. The interrung-fed hybrid coil design with guard rings was found to be superior to conventional designs.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import
 
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Created: Tue, 14 Jun 2016, 12:21:59 EST by System User