NDLI: Influence of detector thickness on resolution in three-headed gamma camera PET

Content Provider	IEEE Xplore Digital Library
Author	Vandenberghe, S. Koltharnmer, J.A. D'Asseler, Y. Matthews, C.G. Koole, M. Van de Walle, R. Lemahieu, I. Dierckx, R.A.
Copyright Year	1963
Abstract	In PET imaging with large area NaI scintillators, uncertainty in the measured position of a photon hitting the detector at an oblique angle exists due to the thickness of the crystal in the detector. To evaluate the influence of the crystal thickness and the angle of incidence on the spatial resolution, simulations, and measurements of a dual- and triple-headed PET system in different configurations were performed. In the simulations, the resolution was calculated as a function of: head radii, crystal thickness, head orientation, and the maximum angle of incidence. The influence of these parameters (except crystal thickness) was also evaluated by measurements on a dual-headed AXIS and on a triple-headed IRIX PET system. It was observed that reducing the average angle-of-incidence (and, hence, reducing the depth-of-interaction uncertainty) tended to improve the spatial resolution. This could be accomplished by restricting the maximum angle-of-incidence, increasing the separation of the heads or changing the orientation of the heads (a 0-120-240 configuration has a greater average angle-of-incidence than a 0-90-180 or 0-180 configuration). However, when taking the effect of noncolinearity of the annihilation into account, increasing the separation of the heads results in a degradation of resolution. The resolution improved by decreasing the crystal thickness (since depth-of-interaction uncertainty was reduced). The resolution was worst for all parameters expected to yield the highest sensitivity (a thick crystal, small radius, and a large acceptance angle).
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	98
Ending Page	103
Page Count	6
File Size	297770
File Format	PDF
ISSN	00189499
Volume Number	49
Issue Number	1
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2002-02-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Gamma ray detection Gamma ray detectors Head Positron emission tomography Thickness measurement Photonic crystals Spatial resolution Optical imaging Area measurement Measurement uncertainty
Content Type	Text
Resource Type	Article
Subject	Nuclear and High Energy Physics Electrical and Electronic Engineering Nuclear Energy and Engineering

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