E. Brian Welch Armando Manduca Roger C. Grimm Heidi A. Ward Clifford R. Jack Jr. Spherical Navigator Echoes for Full 3-D Rigid Body Motion Measurement in MRI. 1235-1236 2001 conf/miccai/2001 MICCAI http://link.springer.de/link/service/series/0558/bibs/2208/22081235.htm db/conf/miccai/miccai2001.html#WelchMGWJ01