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Proceedings Paper

Real-time GPU implementation of a weighted filtered back-projection algorithm for stationary gantry CT reconstruction
Author(s): William Thompson; Edward Morton; Alexander Katsevich; Seongjin Yoon; Michael Frenkel
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Paper Abstract

We present details of a real-time implementation of a new algorithm designed to reduce streak artifacts in switched-source stationary gantry CT reconstruction. The algorithm is of the filtered back-projection type, and uses a voxel-specific weighting function to account for the non-uniform distribution of illumination angles caused by such a scanning geometry. The main challenge in developing a real-time implementation is the storage and memory bandwidth requirements imposed by the weighting function. This has been addressed by storing weights at a low precision and reduced resolution, and using interpolation to recover weights at the full resolution. Results demonstrate real-time performance of the algorithm at a realistic problem size, running on a low-cost consumer grade laptop.

Paper Details

Date Published: 28 May 2019
PDF: 5 pages
Proc. SPIE 11072, 15th International Meeting on Fully Three-Dimensional Image Reconstruction in Radiology and Nuclear Medicine, 110721W (28 May 2019); doi: 10.1117/12.2534855
Show Author Affiliations
William Thompson, Rapiscan Systems (United States)
Edward Morton, Rapiscan Systems (United States)
Alexander Katsevich, iTomography Corp. (United States)
Univ. of Central Florida (United States)
Seongjin Yoon, iTomography Corp. (United States)
Michael Frenkel, iTomography Corp. (United States)


Published in SPIE Proceedings Vol. 11072:
15th International Meeting on Fully Three-Dimensional Image Reconstruction in Radiology and Nuclear Medicine
Samuel Matej; Scott D. Metzler, Editor(s)

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