Real-time GPU implementation of a weighted filtered back-projection algorithm for stationary gantry CT reconstruction

William Thompson; Edward Morton; Alexander Katsevich; Seongjin Yoon; Michael Frenkel

doi:10.1117/12.2534855

28 May 2019 Real-time GPU implementation of a weighted filtered back-projection algorithm for stationary gantry CT reconstruction

William Thompson, Edward Morton, Alexander Katsevich, Seongjin Yoon, Michael Frenkel

Author Affiliations +

Proceedings Volume 11072, 15th International Meeting on Fully Three-Dimensional Image Reconstruction in Radiology and Nuclear Medicine; 110721W (2019) https://doi.org/10.1117/12.2534855
Event: Fully Three-Dimensional Image Reconstruction in Radiology and Nuclear Medicine, 2019, Philadelphia, United States

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.

Citation Download Citation

William Thompson, Edward Morton, Alexander Katsevich, Seongjin Yoon, and Michael Frenkel "Real-time GPU implementation of a weighted filtered back-projection algorithm for stationary gantry CT reconstruction", Proc. SPIE 11072, 15th International Meeting on Fully Three-Dimensional Image Reconstruction in Radiology and Nuclear Medicine, 110721W (28 May 2019); https://doi.org/10.1117/12.2534855

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