Fast Cardiac CINE MRI by Iterative Truncation of Small Transformed Coefficients.
10.13104/imri.2015.19.1.19
- Author:
Jinho PARK
1
;
Hye Jin HONG
;
Young Joong YANG
;
Chang Beom AHN
Author Information
1. Department of Electrical Engineering, Kwangwoon University, Seoul, Korea. cbahn@kw.ac.kr
- Publication Type:Original Article
- Keywords:
Iterative truncation of small transformed coefficients;
Compressed sensing;
Cardiac CINE MRI;
Reconstruction from under-sampled data
- MeSH:
Magnetic Resonance Imaging, Cine*
- From:Investigative Magnetic Resonance Imaging
2015;19(1):19-30
- CountryRepublic of Korea
- Language:English
-
Abstract:
PURPOSE: A new compressed sensing technique by iterative truncation of small transformed coefficients (ITSC) is proposed for fast cardiac CINE MRI. MATERIALS AND METHODS: The proposed reconstruction is composed of two processes: truncation of the small transformed coefficients in the r-f domain, and restoration of the measured data in the k-t domain. The two processes are sequentially applied iteratively until the reconstructed images converge, with the assumption that the cardiac CINE images are inherently sparse in the r-f domain. A novel sampling strategy to reduce the normalized mean square error of the reconstructed images is proposed. RESULTS: The technique shows the least normalized mean square error among the four methods under comparison (zero filling, view sharing, k-t FOCUSS, and ITSC). Application of ITSC for multi-slice cardiac CINE imaging was tested with the number of slices of 2 to 8 in a single breath-hold, to demonstrate the clinical usefulness of the technique. CONCLUSIONS: Reconstructed images with the compression factors of 3-4 appear very close to the images without compression. Furthermore the proposed algorithm is computationally efficient and is stable without using matrix inversion during the reconstruction.
