Technical Program

Paper Detail

Paper:	SA-AM-OS1.7
Session:	MRI Acquisition and Reconstruction
Time:	Saturday, April 8, 11:50 - 12:10
Presentation:	Oral
Title:	Exact Correction of Sharply Varying Off-Resonance Effects in Spiral MRI
Authors:	Mahender Makhijani; University of Southern California
	Krishna Nayak; University of Southern California
Abstract:	Magnetic Resonance Imaging with non-Cartesian acquisition schemes suffer from blurring artifacts induced by 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. Iterative methods have been proposed for sharply varying off-resonance correction but are either computationally intense in the exact form or need approximations like time segmentation to reduce computational cost. Here a new method for accurate and computationally efficient off resonance correction using spatial domain deconvolution is presented.

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