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KMID : 0858520150190010019
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Journal of the Korean Society of Magnetic Resonance in Medicine
2015 Volume.19 No. 1 p.19 ~ p.30
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Fast Cardiac CINE MRI by Iterative Truncation of Small Transformed Coefficients
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Park Jin-Ho
Hong Hye-Jin
Yang Young-Joong
Ahn Chang-Beom
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Abstract
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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.
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KEYWORD
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Iterative truncation of small transformed coefficients, Compressed sensing, Cardiac CINE MRI, Reconstruction from under-sampled data
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