Scatter correction algorithm for cone-beam computed tomography = 콘빔 CT의 산란 보정법에 관한 연구

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Circular cone-beam computed tomography (CBCT) provides three-dimensional anatomy of an object from the projection data acquired in a single-rotation scan. Due to the large illumination area, a high level of scatter limits the image quality of CBCT by reducing the image contrast, increasing the image noise, and introducing inaccurate CT numbers in the reconstructed images. In this work, a scatter correction method using beam-block strips was presented. A single scan was performed on a cylindrical uniform phantom, and scatter was estimated from each projection data. Using beam-block strips that were positioned in a longitudinal direction to the rotation axis, detected signals in the shadow regions were estimated through interpolation. In addition, a separate estimation of signals was made through interpolation in the illuminated regions; in order to get rid of the effect of unwanted partial transmission through the beam-blocking material. The estimated scatter was extracted from the two estimates. A backprojection filtration (BPF) algorithm was applied to image reconstruction. The results showed that about 30% of the error due to scatter has been corrected by the proposed algorithm.
Advisors
Cho, Seung-Ryongresearcher조승룡researcher
Description
한국과학기술원 : 원자력및양자공학과,
Publisher
한국과학기술원
Issue Date
2010
Identifier
455196/325007  / 020084176
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 원자력및양자공학과, 2010.08, [ iv, 24 p. ]

Keywords

image reconstruction; Backprojection-filtration; Scatter correction; Cone-beam CT; Beam-stop strips; 빔차단줄; 영상재건; 역투영필터링; 산란보정; 콘빔 CT

URI
http://hdl.handle.net/10203/49572
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=455196&flag=dissertation
Appears in Collection
NE-Theses_Master(석사논문)
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