X-ray CT metal artifact reduction using L1 minimization = X-ray CT의 금속성 인공음영의 제거를 위한 L1 minimization 기법

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X-ray Computed Tomograyphy (CT) has been studied and applied for several decades, and its analytical inversion method gives perfectly reconstructed image in ideal cases. However, in reconstruction of image with metal prostheses, such as dental implants, traditional analytical inversion of radon transform can cause severe streak artifact called metal artifact. For the metal artifact reduction (MAR), we propose an algorithm using linear interpolation (LI) and FOCUSS. LI reduces metal artifact by smoothing inconsistency of measured sinogram, however, with LI, reconstructed image lost most information about metallic implants. FOCUSS is an optimization method based on L1 minimization. As L1 minimization gives sparse solution, we could recover the vanished metallic object by applying FOCUSS. The experiments had performed for simulation and real dental CT data, and we could reconstruct the image without most of metal artifacts and loss of image.
Advisors
Ye, Jong-Chulresearcher예종철
Description
한국과학기술원 : 바이오및뇌공학과,
Publisher
한국과학기술원
Issue Date
2008
Identifier
586356/325007  / 020063592
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 바이오및뇌공학과, 2008.2, [ vi, 47 p. ]

Keywords

Cone beam CT; 3차원 영상복원; L1 minimization; 금속성 인공음영 제거; Cone beam CT; 3D reconstruction; Metal artifact reduction; L1 minimization

URI
http://hdl.handle.net/10203/196334
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=586356&flag=dissertation
Appears in Collection
BiS-Theses_Master(석사논문)
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