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Interleaved variable density sampling with a constrained parallel imaging reconstruction for dynamic contrast‐enhanced MR angiography
Author(s) -
Wang Kang,
Busse Reed F.,
Holmes James H.,
Beatty Philip J.,
Brittain Jean H.,
Francois Christopher J.,
Reeder Scott B.,
Du Jiang,
Korosec Frank R.
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.22814
Subject(s) - computer science , temporal resolution , contrast (vision) , angiography , acceleration , image resolution , cartesian coordinate system , sampling (signal processing) , artificial intelligence , computer vision , radiology , mathematics , medicine , physics , optics , geometry , filter (signal processing) , classical mechanics
For MR applications such as contrast‐enhanced MR angiography, it is desirable to achieve simultaneously high spatial and temporal resolution. The current clinical standard uses view‐sharing methods combined with parallel imaging; however, this approach still provides limited spatial and temporal resolution. To improve on the clinical standard, we present an interleaved variable density (IVD) sampling method that pseudorandomly undersamples each individual frame of a 3D Cartesian k y – k z plane combined with parallel imaging acceleration. From this dataset, time‐resolved images are reconstructed with a method that combines parallel imaging with a multiplicative constraint. Total acceleration factors on the order of 20 are achieved for contrast‐enhanced MR angiography of the lower extremities, and improvements in temporal fidelity of the depiction of the contrast bolus passage are demonstrated relative to the clinical standard. Magn Reson Med, 2011. © 2011 Wiley‐Liss, Inc.