Sk. Nagle et Dn. Levin, Creating a library of generalized Fourier sampling patterns for irregular 2D regions of support, MAGN RES M, 46(3), 2001, pp. 624-627
Citations number
9
Categorie Soggetti
Radiology ,Nuclear Medicine & Imaging","Medical Research Diagnosis & Treatment
Multiple-region MRI (mrMRI) represents a generalization of the Shannon samp
ling theorem to permit sparse k-space sampling whenever the scanned object
or its high-contrast edges are confined to multiple known regions. Use of a
n optimal mrMRI sampling pattern produces an image with root-mean-squared (
RMS) noise over the supporting regions equal to the RMS noise in a conventi
onal Fourier image with the same total area of support. Analytical solution
s for such sampling patterns have been described previously for all arrange
ments of two or three (noncollinear) supporting regions. This work describe
s a robust numerical method for creating a library of optimal and near-opti
mal mrMRI sampling patterns for more complicated geometries. The average no
ise amplification over all sampling patterns in the demonstration library w
as only 4%, with 30% of the sampling patterns resulting in no noise amplifi
cation whatsoever. (C) 2001 Wiley-Liss, Inc.