NDLI: Local models for artefact reduction in iterative CT reconstruction

Content Provider	IEEE Xplore Digital Library
Author	Van Slambrouck, K. Nuyts, J.
Copyright Year	2011
Description	Author affiliation: Dept. of Nuclear Medicine, K.U.Leuven, B-3000, Belgium (Van Slambrouck, K.; Nuyts, J.)
Abstract	Metal artefact reduction (MAR) in computed tomography remains a challenging problem. Projection completion (PC) and iterative reconstruction with an advanced projection model are the two most important MAR methods. PC often results in strong artefact reduction, but by the interpolation step information about the metal and its surrounding is lost. This information can be important in e.g. orthopaedic surgery for implant follow-up. Iterative methods use all available information and are more suitable in such cases. Unfortunately, these methods are slow, especially when using a more adequate, more complex model. We present a local model reconstruction scheme which uses iterative reconstruction but only increases the complexity of the model in the vicinity of metals. Hereby we can limit the computation time while keeping a similar image quality. Moreover, when using a sequential update of several image parts, one obtains a better convergence of the metals, leading to an improved artefact reduction.
Starting Page	4346
Ending Page	4350
File Size	740429
Page Count	5
File Format	PDF
ISBN	9781467301183
ISSN	10823654
e-ISBN	9781467301206
DOI	10.1109/NSSMIC.2011.6153837
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-10-23
Publisher Place	Spain
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Image reconstruction Computational modeling Computed tomography
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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