NDLI: Comparison of Circular and Polygonal Planar Orbits for Pinhole and Slit-Slat SPECT

Content Provider	IEEE Xplore Digital Library
Author	Accorsi, R. Ayan, A.S. Metzler, S.D.
Copyright Year	1963
Abstract	Analytic formulas and Monte Carlo simulation are used to calculate and compare the sensitivity of circular and polygonal orbits at different points in the Field of View (FoV) for both pinhole and slit-slat collimation. Results show that for a given slit-slat collimator an N-sided polygonal orbit tangent to the FoV generally provides average sensitivity lower than the tightest circular orbit consistent with the same aperture angle, but with better spatial resolution that can be traded for sensitivity for a constant-resolution comparison. This generally results in a slight advantage for the polygonal orbit. However, this advantage depends on the clearance that must be allowed between the orbit and the FoV and decreases quickly, vanishing when even a few millimeters of space are left, which in practice is necessary to accommodate mechanical constraints. For a pinhole collimator the advantage for the tangent polygonal orbit is more consistent, but similar conclusions are reached again when clearance is considered. A direct comparison at constant resolution between slit-slat and pinhole collimation in a single transverse plane is shown to be possible with parameters typical of small-animal imaging applications only for detectors with excellent intrinsic resolution; in this case, pinhole collimation is shown to be more sensitive in magnifying geometries, but reduced axial FoV and increased axial blurring should also be considered for a more complete comparison.
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	694
Ending Page	703
Page Count	10
File Size	447884
File Format	PDF
ISSN	00189499
Volume Number	56
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Orbits Collimators Image resolution Radiology Orbital calculations Apertures Spatial resolution Detectors Geometry Cameras SPECT Gamma-ray cameras medical imaging
Content Type	Text
Resource Type	Article
Subject	Nuclear and High Energy Physics Electrical and Electronic Engineering Nuclear Energy and Engineering

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Comparison of circular and polygonal planar orbits for SPECT scanning

Reconstruction of Phantom SPECT Scans Acquired with a Slit-Slat Collimator

Comparison of circular and polygonal planar orbits for pinhole and slit-slat SPECT

Slit-Slat and Multi-Slit-Slat Collimator Design and Experimentally Acquired Phantom Images From a Rotating Prototype

Slit-Slat Collimator Equipped Gamma Camera for Whole-Mouse SPECT-CT Imaging

Analytical derivation and experimental verification of a sensitivity formula for slit-slat SPECT collimation

Investigation of efficiency and spatial resolution using pinholes with small pinhole angle

Sensitivity of SPECT with rotating slat collimators

First experimental results from a prototype rotating slit-slat collimator

Comparison of Circular and Polygonal Planar Orbits for Pinhole and Slit-Slat SPECT

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