Projection reconstruction MR imaging using FOCUSS.
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.
Ye
Jong Chul
JC
Department of Biosystems, Korea Advanced Institute of Science & Technology, Daejon 305-701, Korea. jong.ye@kaist.ac.kr
Tak
Sungho
S
Han
Yeji
Y
Park
Hyun Wook
HW
D000465:Algorithms; D016477:Artifacts; D001931:Brain Mapping / Q000379:methods*; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods*; D008279:Magnetic Resonance Imaging / Q000379:methods*; D019047:Phantoms, Imaging