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Golden‐angle radial sparse parallel MRI: Combination of compressed sensing, parallel imaging, and golden‐angle radial sampling for fast and flexible dynamic volumetric MRI
Author(s) -
Feng Li,
Grimm Robert,
Block Kai Tobias,
Chandarana Hersh,
Kim Sungheon,
Xu Jian,
Axel Leon,
Sodickson Daniel K.,
Otazo Ricardo
Publication year - 2014
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.24980
Subject(s) - dynamic contrast enhanced mri , dynamic imaging , real time mri , computer science , compressed sensing , temporal resolution , iterative reconstruction , image resolution , robustness (evolution) , artificial intelligence , computer vision , magnetic resonance imaging , physics , image processing , optics , radiology , medicine , biochemistry , chemistry , gene , digital image processing , image (mathematics)
Purpose To develop a fast and flexible free‐breathing dynamic volumetric MRI technique, iterative Golden‐angle RAdial Sparse Parallel MRI (iGRASP), that combines compressed sensing, parallel imaging, and golden‐angle radial sampling. Methods Radial k‐space data are acquired continuously using the golden‐angle scheme and sorted into time series by grouping an arbitrary number of consecutive spokes into temporal frames. An iterative reconstruction procedure is then performed on the undersampled time series where joint multicoil sparsity is enforced by applying a total‐variation constraint along the temporal dimension. Required coil‐sensitivity profiles are obtained from the time‐averaged data. Results iGRASP achieved higher acceleration capability than either parallel imaging or coil‐by‐coil compressed sensing alone. It enabled dynamic volumetric imaging with high spatial and temporal resolution for various clinical applications, including free‐breathing dynamic contrast‐enhanced imaging in the abdomen of both adult and pediatric patients, and in the breast and neck of adult patients. Conclusion The high performance and flexibility provided by iGRASP can improve clinical studies that require robustness to motion and simultaneous high spatial and temporal resolution. Magn Reson Med 72:707–717, 2014. © 2013 Wiley Periodicals, Inc.