Scattered radiation in flat-detector based cone-beam CT: analysis of voxelized patient simulations

Jens Wiegert; Matthias Bertram

doi:10.1117/12.652719

2 March 2006 Scattered radiation in flat-detector based cone-beam CT: analysis of voxelized patient simulations

Jens Wiegert, Matthias Bertram

Proceedings Volume 6142, Medical Imaging 2006: Physics of Medical Imaging; 614235 (2006) https://doi.org/10.1117/12.652719
Event: Medical Imaging, 2006, San Diego, California, United States

Abstract

This paper presents a systematic assessment of scattered radiation in flat-detector based cone-beam CT. The analysis is based on simulated scatter projections of voxelized CT images of different body regions allowing to accurately quantify scattered radiation of realistic and clinically relevant patient geometries. Using analytically computed primary projection data of high spatial resolution in combination with Monte-Carlo simulated scattered radiation, practically noise-free reference data sets are computed with and without inclusion of scatter. The impact of scatter is studied both in the projection data and in the reconstructed volume for the head, thorax, and pelvis regions. Currently available anti-scatter grid geometries do not sufficiently compensate scatter induced cupping and streak artifacts, requiring additional software-based scatter correction. The required accuracy of scatter compensation approaches increases with increasing patient size.

Citation Download Citation

Jens Wiegert and Matthias Bertram "Scattered radiation in flat-detector based cone-beam CT: analysis of voxelized patient simulations", Proc. SPIE 6142, Medical Imaging 2006: Physics of Medical Imaging, 614235 (2 March 2006); https://doi.org/10.1117/12.652719

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