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Prior estimate‐based compressed sensing in parallel MRI
Author(s) -
Wu Bing,
Millane Rick P.,
Watts Richard,
Bones Philip J.
Publication year - 2011
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.22545
Subject(s) - compressed sensing , computer science , image (mathematics) , artificial intelligence , encoding (memory) , computer vision , iterative reconstruction , sensitivity (control systems) , process (computing) , sampling (signal processing) , pattern recognition (psychology) , sorting , algorithm , filter (signal processing) , electronic engineering , engineering , operating system
Abstract Two improved compressed sensing (CS)‐based image reconstruction methods for MRI are proposed: prior estimate‐based compressed sensing (PECS) and sensitivity encoding‐based compressed sensing (SENSECS). PECS allows prior knowledge of the underlying image to be intrinsically incorporated in the image recovery process, extending the use of data sorting as first proposed by Adluru and DiBella (Int J Biomed Imaging 2008: 341648). It does so by rearranging the elements in the underlying image based on the magnitude information gathered from a prior image estimate, so that the underlying image can be recovered in a new form that exhibits a higher level of sparsity. SENSECS is an application of PECS in parallel imaging. In SENSECS, image reconstruction is carried out in two stages: SENSE and PECS, with the SENSE reconstruction being used as a image prior estimate in the following PECS reconstruction. SENSECS bypasses the conflict of sampling pattern design in directly applying CS recovery in multicoil data sets and exploits the complementary characteristics of SENSE‐type and CS‐type reconstructions, hence achieving better image reconstructions than using SENSE or CS alone. The characteristics of PECS and SENSECS are investigated using experimental data. Magn Reson Med, 2010. © 2010 Wiley‐Liss, Inc.