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Proceedings Paper

System optics in both backprojection and forward projection for model-based iterative reconstruction
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Paper Abstract

Advantages of iterative reconstruction (IR) algorithms over standard filtered backprojection (FBP) algorithms include improved resolution and better noise performance, and many IR algorithms have been described in the literature. More recently model-based IR algorithms (MBIR) have been developed, which incorporate accurate system models into IR, resulting in better image quality than IR algorithms without a system model. This work investigates the resolution improvement achieved when a system optics model (SOM) has been included in a standard OS-SART algorithm. Three OS-SART algorithms have been compared: (1) "Pencil beam" (IR-P) with no system optics; (2) system optics included in forward projection (IR-SOM-FP), and (3) system optics included in both forward and backprojection (IRSOM-FPBP). Simulated reconstructions of a 0.2 mm bead show that IR-SOM-FPBP produced a FWHM resolution of 0.41 mm, considerably better than FBPJ (0.87 mm), IR-P (0.63 mm), and IR-SOM-FP (0.59 mm).

Paper Details

Date Published: 3 March 2012
PDF: 8 pages
Proc. SPIE 8313, Medical Imaging 2012: Physics of Medical Imaging, 83133L (3 March 2012); doi: 10.1117/12.911386
Show Author Affiliations
Ilmar A. Hein, Toshiba Medical Research Institute USA (United States)
Alexander Zamyatin, Toshiba Medical Research Institute USA (United States)

Published in SPIE Proceedings Vol. 8313:
Medical Imaging 2012: Physics of Medical Imaging
Norbert J. Pelc; Robert M. Nishikawa; Bruce R. Whiting, Editor(s)

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