NDLI: Frequency domain implementation of the three-dimensional geometric point response correction in SPECT imaging

Content Provider	IEEE Xplore Digital Library
Author	Zeng, G.L. Gullberg, G.T.
Copyright Year	1963
Abstract	Analytical expressions exist for the geometric point response functions for parallel, fan, and cone beam collimators. The geometric point response functions are shown to be shift-invariant for these three collimators if the distance between the point source and the detection plane is constant. For single photon emission computed tomography (SPECT), this property is used in the projector/backprojector to correct for geometric distortion using the iterative EM reconstruction algorithm. In the implementation, the system geometric response, the crystal intrinsic response and the attenuation were compensated. The attenuation compensation was accomplished in the spatial domain. The point response corrections were accomplished using frequency domain filtering, taking advantage of the shift-invariance of the system point response function at a fixed depth. The frequency domain implementation significantly speeded up the algorithm. Phantom studies showed the increase of resolution and the reduction of density nonuniformity artifacts which were due to the spatially varying system response function and the attenuation effect.<>
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	1444
Ending Page	1453
Page Count	10
File Size	688705
File Format	PDF
ISSN	00189499
Volume Number	39
Issue Number	5
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1992-10-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Frequency domain analysis Face detection Detectors Attenuation Image reconstruction Single photon emission computed tomography Apertures Optical collimators Geometry Reconstruction algorithms
Content Type	Text
Resource Type	Article
Subject	Nuclear and High Energy Physics Electrical and Electronic Engineering Nuclear Energy and Engineering

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
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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