An improved nuclear magnetic resonance (NMR) apparatus for use in topical magnetic resonance (TMR) spectroscopy and other remote sensing NMR applications includes a semitoroidal radio-frequency (rf) coil. The semitoroidal rf coil produces an effective alternating magnetic field at a distance from the...http://www.google.de/patents/US4590427?utm_source=gb-gplus-sharePatent US4590427 - Nuclear magnetic resonance apparatus having semitoroidal rf coil for use in topical NMR and NMR imaging
