A local coil for magnetic resonance imaging employs a cylindrical form supporting a coil array of one or more coil groups arranged circumferentially around the cylindrical form. Multiple coil groups are overlapped to provide electrical isolation between the coil groups preserving the signal to noise...http://www.google.com.au/patents/US5329233?utm_source=gb-gplus-sharePatent US5329233 - Cylindrical local coil for nuclear magnetic resonance imaging
