In vivo accelerated MR parameter mapping using annihilating filter-based low rank Hankel matrix (ALOHA)
Dongwook Lee1, Kyong Hwan Jin1, Eung-yeop Kim2, Sunghong Park1, and Jong Chul Ye1
1Bio and Brain Engineering, Korea Advanced Institute of Science and Technology, Daejeon, Korea, Republic of, 2Radiology, Gachon University Gil Medical Center, Inchoen, Korea, Republic of
The purpose of this study is to develop an accelerated MR parameter mapping technique. For accelerated T1 and T2 mapping, spin-echo inversion recovery and multi-echo spin echo pulse sequences were redesigned to perform undersampling along phase encoding direction. The highly missing k-space were then interpolated by using recently proposed annihilating filter based low-rank Hankel matrix approach (ALOHA). By exploiting the duality between the transform domain sparsity and the low-rankness of weighted Hankel structured matrix in k-space, ALOHA provided outperforming reconstruction results compared to the existing compressed sensing methods.
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