NDLI: A FDK-Based Reconstruction Method for Off-Centered Circular Trajectory Cone Beam Tomography

Content Provider	IEEE Xplore Digital Library
Author	Valton, S. Peyrin, F. Sappey-Marinier, D.
Copyright Year	1963
Abstract	In the framework of post-genomic era, computed tomography (CT) and positron emission tomography (PET) systems were recently adapted to the new requirements of small animal imaging. In order to combine ideally anatomical and functional informations, simultaneous acquisitions of the two modalities are necessary. In this context, we studied the tomographic reconstruction required by a new prototype of PET/CT micro-system where the X-ray source has to be off-centered. In contrast to conventional micro-CT where the source and detector rotate in the same plane, our configuration imposes that the source point and its orthogonal projection on the detector plane describe two parallel distinct circles. To address this specific geometry, we derive a new general formulation of the Feldkamp (FDK) algorithm. This formula, called alpha-FDK, with alpha representing the off-center angle of the source, is evaluated using computer simulations. While the image quality obtained for small values of alpha(<17deg) is comparable to that obtained in standard circular cone beam geometry, strong artifacts appear for higher values. In order to interpret these degradations, we first analyze the projection/reconstruction system in terms of the impulse response and show the insufficiency of ramp filtering. Second, the missing data problem due to the off-centered geometry is analyzed in the Radon space
Sponsorship	IEEE Nuclear and Plasma Sciences Society Computer Applications in Nuclear and Plasma Sciences (CANPS) Lawrence Berkeley Lab. Lawrence Livermore Nat. Lab. APS College of William and Mary Continuous Electron Beam Accelerator Facility NASA Defence Nuclear Agency Sandia National Laboratories Jet Propulsion Laboratory Brookhaven Nat. Lab. Lawrence Livermore Nat. Lab IEEE/NPPS Radiat. Effects Committee Defence Nuclear Agency/DoD Sandia National Laboratories/DOE Jet Propulsion Laboratory/NASA Phillips Lab./DoD
Starting Page	2736
Ending Page	2745
Page Count	10
File Size	1827536
File Format	PDF
ISSN	00189499
Volume Number	53
Issue Number	5
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2006-10-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Reconstruction algorithms Computed tomography Positron emission tomography Geometry Image reconstruction Detectors Animals Optical imaging Prototypes X-ray imaging cone beam Circular trajectory computer tomography
Content Type	Text
Resource Type	Article
Subject	Nuclear and High Energy Physics Electrical and Electronic Engineering Nuclear Energy and Engineering

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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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