In known NMR imaging apparatuses it has been the practice to arrange the G.sub.R field gradient, which rotates in the plane of the examined slice, with a zero crossing substantially in the center of the slice and to demodulate at the Larmor frequency at the zero crossing. It is now proposed to demodulate...http://www.google.com.au/patents/US4333053?utm_source=gb-gplus-sharePatent US4333053 - Imaging systems
