Xm. Lou et al., ON THE PERFORMANCE OF TUBULAR SURFACE COILS IN NUCLEAR-MAGNETIC-RESONANCE IMAGING AND SPECTROSCOPY, IEEE transactions on nuclear science, 42(1), 1995, pp. 41-47
Surface coils are important devices in the clinical application of nuc
lear magnetic resonance imaging and spectroscopy (NMRIS) because they
have higher signal-to-noise ratios than body or head coils in superfic
ial regions. This paper describes our theoretical and experimental stu
dy of the performances of tubular surface coils, aiding the effective
application of such coils to NMRIS. We present formulas for the RF mag
netic (H1) fields produced by tubular surface coils placed over layere
d media, and for the self- and loaded-impedances of these coils. The c
alculated results show the dependence of the coil performances on the
coil design parameters and the characteristics of the sample under tes
t. We include the calculated results for the H1 field phase shifts in
conductive samples.