Scatter correction in cone-beam CT via a half beam blocker technique allowing simultaneous acquisition of scatter and image information

Medical Physics
Ho LeeBenjamin P Fahimian

Abstract

X-ray scatter incurred to detectors degrades the quality of cone-beam computed tomography (CBCT) and represents a problem in volumetric image guided and adaptive radiation therapy. Several methods using a beam blocker for the estimation and subtraction of scatter have been proposed. However, due to missing information resulting from the obstruction of the blocker, such methods require dual scanning or dynamically moving blocker to obtain a complete volumetric image. Here, we propose a half beam blocker-based approach, in conjunction with a total variation (TV) regularized Feldkamp-Davis-Kress (FDK) algorithm, to correct scatter-induced artifacts by simultaneously acquiring image and scatter information from a single-rotation CBCT scan. A half beam blocker, comprising lead strips, is used to simultaneously acquire image data on one side of the projection data and scatter data on the other half side. One-dimensional cubic B-Spline interpolation/extrapolation is applied to derive patient specific scatter information by using the scatter distributions on strips. The estimated scatter is subtracted from the projection image acquired at the opposite view. With scatter-corrected projections where this subtraction is completed, the FDK...Continue Reading

References

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Citations

Jun 7, 2013·Physics in Medicine and Biology·Johan NuytsFreek J Beekman
Apr 3, 2016·Medical Physics·Wei ZhaoLei Xing
Sep 12, 2013·Radiotherapy and Oncology : Journal of the European Society for Therapeutic Radiology and Oncology·Simon van KranenJan-Jakob Sonke
Jan 20, 2017·Medical Physics·Hao GongGuohua Cao
Jul 18, 2015·Physics in Medicine and Biology·Changhwan KimSeungryong Cho
Jan 17, 2015·Physics in Medicine and Biology·Wei ZhaoGuang-Hong Chen
Jan 12, 2021·Radiological Physics and Technology·Taisei Shimomura, Akihiro Haga
Sep 18, 2021·Physics in Medicine and Biology·Branimir RusanovMahsheed Sabet

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