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Simultaneous acquisition of gradient‐echo and asymmetric spin‐echo for single‐shot z‐shim: Z‐SAGA
Author(s) -
Heberlein Keith Arron,
Hu Xiaoping
Publication year - 2004
Publication title -
magnetic resonance in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.696
H-Index - 225
eISSN - 1522-2594
pISSN - 0740-3194
DOI - 10.1002/mrm.10680
Subject(s) - shim (computing) , pulse sequence , spin echo , gradient echo , nuclear magnetic resonance , physics , echo (communications protocol) , fast spin echo , sequence (biology) , single shot , echo time , flip angle , signal (programming language) , optics , computer science , magnetic resonance imaging , chemistry , medicine , radiology , computer network , biochemistry , erectile dysfunction , programming language
Abstract This article describes the Z‐SAGA pulse sequence, a technique for recovering susceptibility losses in EPI images for neuroimaging applications. The pulse sequence is based on an asymmetric spin echo EPI sequence and acquires a gradient echo image and an asymmetric spin echo image in a single shot. For one of the images, a z‐shim gradient pulse is applied to compensate for susceptibility‐related field distortions. The two images are combined to form an image with reduced signal loss. This sequence is simple to implement and experimentally demonstrated to be effective for BOLD imaging. Magn Reson Med 51:212–216, 2004. © 2003 Wiley‐Liss, Inc.