Exact correction of sharply varying off-resonance effects in spiral MRI using spatially varying deconvolution.
Makhijani M, Nayak K
University of Southern California
MRI with non-Cartesian acquisition schemes suffer from blurring artifacts due to off-resonance. Conventional algorithms for off-resonance correction are approximate in nature and assume that the off-resonance map is varying smoothly across the object. This assumption is violated in the case of susceptibility related off-resonance which is sharply varying near certain tissue interfaces. We present a new method for fast and accurate off-resonance correction using spatial domain deconvolution that does not assume smoothness of the field map. Phantom and in-vivo results are presented.