Projection reconstruction MR imaging using FOCUSS. |
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Authors: | Jong Chul Ye Sungho Tak Yeji Han Hyun Wook Park |
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Institution: | Department of Biosystems, Korea Advanced Institute of Science & Technology, Daejon 305-701, Korea. jong.ye@kaist.ac.kr |
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Abstract: | The focal underdetermined system solver (FOCUSS) was originally designed to obtain sparse solutions by successively solving quadratic optimization problems. This article adapts FOCUSS for a projection reconstruction MR imaging problem to obtain high resolution reconstructions from angular under-sampled radial k-space data. We show that FOCUSS is effective for projection reconstruction MRI, since medical images are usually sparse in some sense and the center region of the undersampled radial k-space samples still provides a low resolution, yet meaningful, image essential for the convergence of FOCUSS. The new algorithm is successfully applied for synthetic data as well as in vivo brain imaging obtained by under-sampled radial spin echo sequence. |
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Keywords: | projection reconstruction sparsity angular undersampling FOCUSS compressed sensing |
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