Searchlight CT: a new reconstruction method for collimated X-ray tomography

Authors:
Robert Azencott;Anando Sen;Bernhard G. Bodmann;King C. Li;Demetrio Labate;Xiaobo Zhou
Affiliations:
University of Houston, Houston, Texas;University of Houston, Houston, Texas;University of Houston, Houston, Texas;The Methodist Hospital Research Institute, Houston, Texas;University of Houston, Houston, Texas;The Methodist Hospital, Research Institute Houston, Texas
Venue:
Proceedings of the 5th International ICST Conference on Performance Evaluation Methodologies and Tools
Year:
2011

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Abstract

The method presented in this paper aims to reduce the overall radiation exposure from X-ray CT scans when only the reconstruction of a region of interest is required. To achieve this goal, the Searchlight CT algorithm restricts the acquisition to X-rays passing mainly through the region of interest. The algorithm uses an iteration of the X-ray transform and of a regularized inverse, which converges rapidly and for which generic conditions of converges are provided. The performance of the Searchlight CT algorithm is illustrated on both phantom and experimental data.