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Proceedings Paper

A patch-based CBCT scatter artifact correction using prior CT
Author(s): Xiaofeng Yang; Tian Liu; Xue Dong; Xiangyang Tang; Eric Elder; Walter J. Curran; Anees Dhabaan
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Paper Abstract

We have developed a novel patch-based cone beam CT (CBCT) artifact correction method based on prior CT images. First, we used the image registration to align the planning CT with the CBCT to reduce the geometry difference between the two images. Then, we brought the planning CT-based prior information into the Bayesian deconvolution framework to perform the CBCT scatter artifact correction based on patchwise nonlocal mean strategy. We evaluated the proposed correction method using a Catphan phantom with multiple inserts based on contrast-to-noise ratios (CNR) and signal-to-noise ratios (SNR), and the image spatial non-uniformity (ISN). All values of CNR, SNR and ISN in the corrected CBCT image were much closer to those in the planning CT images. The results demonstrated that the proposed CT-guided correction method could significantly reduce scatter artifacts and improve the image quality. This method has great potential to correct CBCT images allowing its use in adaptive radiotherapy.

Paper Details

Date Published: 9 March 2017
PDF: 7 pages
Proc. SPIE 10132, Medical Imaging 2017: Physics of Medical Imaging, 1013229 (9 March 2017); doi: 10.1117/12.2253935
Show Author Affiliations
Xiaofeng Yang, Emory Univ. (United States)
Winship Cancer Institute of Emory Univ. (United States)
Tian Liu, Emory Univ. (United States)
Winship Cancer Institute of Emory Univ. (United States)
Xue Dong, Emory Univ. (United States)
Winship Cancer Institute of Emory Univ. (United States)
Xiangyang Tang, Emory Univ. (United States)
Winship Cancer Institute of Emory Univ. (United States)
Eric Elder, Emory Univ. (United States)
Winship Cancer Institute of Emory Univ. (United States)
Walter J. Curran, Emory Univ. (United States)
Winship Cancer Institute of Emory Univ. (United States)
Anees Dhabaan, Emory Univ. (United States)
Winship Cancer Institute of Emory Univ. (United States)


Published in SPIE Proceedings Vol. 10132:
Medical Imaging 2017: Physics of Medical Imaging
Thomas G. Flohr; Joseph Y. Lo; Taly Gilat Schmidt, Editor(s)

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