Technical Program

Paper Detail

Paper:	TH-PM-PS1.3
Session:	MRI Reconstruction and Analysis
Time:	Thursday, April 6, 15:20 - 16:40
Presentation:	Poster
Title:	Reconstruction of Undersampled Dynamic Spiral MR Images
Authors:	Taehoon Shin; University of Southern California
	Jon Nielsen; University of Southern California
	Krishna Nayak; University of Southern California
Abstract:	The temporal resolution of dynamic MRI can be increased by sampling a fraction of k-space in an interleaved fashion, which causes spatial and temporal aliasing. We describe algebraically the aliasing process caused by spiral undersampling to formulate unaliasing as a set of independent inverse problems. Since each linear system is severely ill-conditioned, zeros are assumed in the solution. Specifically the size and the location of assumed zeros necessary for obtaining a unique solution is inspected. To overcome the problems of excessive memory and computation time needed for direct inverse computation, a fast implementation of the conjugate gradient (CG) method is proposed. Simulation using dynamic spiral cardiac images demonstrates improved temporal resolution of the proposed method.

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