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Fast Cardiac CINE MRI by Iterative Truncation of Small Transformed Coefficients
Article de En | WPRIM | ID: wpr-145442
Bibliothèque responsable: WPRO
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.
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Texte intégral: 1 Indice: WPRIM Sujet Principal: IRM dynamique langue: En Texte intégral: Investigative Magnetic Resonance Imaging Année: 2015 Type: Article
Texte intégral: 1 Indice: WPRIM Sujet Principal: IRM dynamique langue: En Texte intégral: Investigative Magnetic Resonance Imaging Année: 2015 Type: Article