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Iterative Reconstruction-Reprojection: An Algorithm for Limited Data Cardiac-Computed Tomography

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4 Author(s)
Nassi, Menahem ; Diasonics, Inc., Milpitas, CA 95305 and the Department of Radiology, Stanford University ; Brody, William R. ; Medoff, Barry P. ; Macovski, A.

Cardiac X-ray computed tomography (CT) has been limited due to scanning times which are considerably longer (1 s) than required to resolve the beating heart (0.1 s). The otherwise attractive convolution-backprojection algorithm is not suited for CT image reconstruction from measurements comprising an incomplete set of projection data. In this paper, an iterative reconstruction-reprojection (IRR) algorithm is proposed for limited projection data CT image reconstruction. At each iteration, the missing views are estimated based on reprojection, which is a software substitute for the scanning process. The standard fan-beam convolution-backprojection algorithm is then used for image reconstruction. The proposed IRR algorithm enables the use of convolution-backprojection in limited angle of view and in limited field of view CT cases. The potential of this method for cardiac CT reconstruction is demonstrated using computer simulated data.

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Biomedical Engineering, IEEE Transactions on  (Volume:BME-29 ,  Issue: 5 )