Real-time 3D image registration for functional MRI.
Subject head movements are one of the main practical difficulties with brain functional MRI. A fast, accurate method for rotating and shifting a three-dimensional (3D) image using a shear factorization of the rotation matrix is described. Combined with gradient descent (repeated linearization) on a least squares objective function, 3D image realignment for small movements can be computed as rapidly as whole brain images can be acquired on current scanners. Magn Reson Med 42:1014-1018, 1999.
Cox
R W
RW
Biophysics Research Institute, Medical College of Wisconsin, Milwaukee, WI 53226, USA. rwcox@mcw.edu
Jesmanowicz
A
A
D001921:Brain / Q000033:anatomy & histology*; D019416:Head Movements; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008279:Magnetic Resonance Imaging / Q000379:methods*