Title :
On the performance of tubular surface coils in nuclear magnetic resonance imaging and spectroscopy
Author :
Lou, Xiaoming ; Smith, Charles D. ; Gedney, Stephen D. ; Li, Jian ; Kadaba, Prasad K.
Author_Institution :
Dept. of Electr. Eng., Kentucky Univ., Lexington, KY, USA
fDate :
2/1/1995 12:00:00 AM
Abstract :
Surface coils are important devices in the clinical application of nuclear magnetic resonance imaging and spectroscopy (NMRIS) because they have higher signal-to-noise ratios than body or head coils in superficial regions. This paper describes our theoretical and experimental study of the performances of tubular surface coils, aiding the effective application of such coils to NMRIS. We present formulas for the RF magnetic (H1) fields produced by tabular surface coils placed over layered media, and for the self- and loaded-impedances of these coils. The calculated results show the dependence of the coil performances on the coil design parameters and the characteristics of the sample under test. We include the calculated results for the H1 field phase shifts in conductive samples
Keywords :
NMR spectroscopy; biomedical NMR; H1 field phase shifts; NMRIS; RF magnetic fields; clinical application; coil design parameters; conductive samples; layered media; loaded-impedances; nuclear magnetic resonance imaging; nuclear magnetic resonance spectroscopy; self-impedances; signal-to-noise ratios; superficial regions; tubular surface coils performance; Coils; Equations; Magnetic field measurement; Magnetic resonance imaging; Nonhomogeneous media; Nuclear magnetic resonance; Radio frequency; Spectroscopy; Surface impedance; Transmitters;
Journal_Title :
Nuclear Science, IEEE Transactions on
