TY - GEN
T1 - Undersampled dynamic magnetic resonance imaging using patch-based spatiotemporal dictionaries
AU - Wang, Yanhua
AU - Zhou, Yihang
AU - Ying, Leslie
PY - 2013
Y1 - 2013
N2 - Dynamic magnetic resonance imaging (dMRI) requires high spatial and temporal resolutions, which is challenging due to the low imaging speed. To reduce the imaging time, a patch-based spatiotemporal dictionary learning (DL) model is proposed for compressed-sensing reconstruction of dynamic images from undersampled data. Specifically, the dynamic image sequence is divided into overlapping patches along both the spatial and temporal directions. These patches are expected to be sparsely represented over a set of temporal-dependent spatiotemporal dictionaries. The images are then reconstructed from the undersampled data in (k,t) space under such sparseness constraints, where the dictionaries are learned iteratively. Alternating optimization is applied to solve the problem. Simulation results show that the proposed method is capable of preserving details in both spatial and temporal directions.
AB - Dynamic magnetic resonance imaging (dMRI) requires high spatial and temporal resolutions, which is challenging due to the low imaging speed. To reduce the imaging time, a patch-based spatiotemporal dictionary learning (DL) model is proposed for compressed-sensing reconstruction of dynamic images from undersampled data. Specifically, the dynamic image sequence is divided into overlapping patches along both the spatial and temporal directions. These patches are expected to be sparsely represented over a set of temporal-dependent spatiotemporal dictionaries. The images are then reconstructed from the undersampled data in (k,t) space under such sparseness constraints, where the dictionaries are learned iteratively. Alternating optimization is applied to solve the problem. Simulation results show that the proposed method is capable of preserving details in both spatial and temporal directions.
KW - compressed sensing
KW - dictionary learning
KW - dynamic magnetic resonance imaging
KW - spatiotemporal dictionary
UR - http://www.scopus.com/inward/record.url?scp=84881627549&partnerID=8YFLogxK
U2 - 10.1109/ISBI.2013.6556470
DO - 10.1109/ISBI.2013.6556470
M3 - Conference contribution
AN - SCOPUS:84881627549
SN - 9781467364546
T3 - Proceedings - International Symposium on Biomedical Imaging
SP - 294
EP - 297
BT - ISBI 2013 - 2013 IEEE 10th International Symposium on Biomedical Imaging
T2 - 2013 IEEE 10th International Symposium on Biomedical Imaging: From Nano to Macro, ISBI 2013
Y2 - 7 April 2013 through 11 April 2013
ER -