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Efficient multiple acquisitions by skipped phase encoding and edge deghosting (SPEED) using shared spatial information
Author(s) -
Chang Zheng,
Xiang QingSan,
Ji Jim,
Yin FangFang
Publication year - 2009
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.21809
Subject(s) - undersampling , encoding (memory) , computer science , enhanced data rates for gsm evolution , phase (matter) , algorithm , order (exchange) , index (typography) , artificial intelligence , physics , finance , economics , quantum mechanics , world wide web
The fast MRI method of Skipped Phase Encoding and Edge Deghosting (SPEED) is further developed to accelerate multiple acquisitions. In a single acquisition, SPEED first acquires three sparse ghosted edge maps with an undersampling factor of N/3, which are modeled with a double‐layer structure and described by three equations with two unknown ghosts, each with a unique ghost order index. By minimizing least‐square‐error, a pair of ghost order indexes is determined. Based on them, the two corresponding ghosts are resolved, leading to a deghosted image. In this case, three equations are needed to determine the ghost order index, while only two equations are required to resolve the two ghosts. This shows both inefficiency and potential. Multiple acquisitions often contain similar spatial information. The similarities can be used to improve efficiency by sharing the ghost order index among different acquisitions, leading to acceleration factors greater than that achievable with single acquisition. Magn Reson Med 61:229–233, 2009. © 2008 Wiley‐Liss, Inc.

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