Technical Program

Paper Detail

Paper:	SA-AM-OS1.1
Session:	MRI Acquisition and Reconstruction
Time:	Saturday, April 8, 09:30 - 09:50
Presentation:	Oral
Title:	Regularized Fieldmap Estimation in MRI
Authors:	Jeffrey A. Fessler; University of Michigan
	Desmond Yeo; University of Michigan
	Douglas C. Noll; University of Michigan
Abstract:	In fast MR imaging such as echo-planar imaging and spiral scans, it is important to correct for the effects of field inhomogeneity to reduce image distortion and blurring. Such corrections require an accurate field map, the off-resonance frequency at each voxel. Standard methods yield noisy fieldmaps, particularly in image regions having low spin density. This paper describes regularized methods for fieldmap estimation, exploiting the fact that fieldmaps are smooth functions. Efficient convergent algorithms are given even though the problem is highly nonlinear. Results show that the proposed regularized methods significantly improve the quality of fieldmap estimates relative to conventional unregularized methods.

ISBI 2006 is sponsored by

and organized in cooperation with