Simulation results of a dual aperture gamma ray imager

Won Ho Lee, David K. Wehe

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)

Abstract

We report on a hybrid radiation imaging system that combines the advantages of a multi-aperture mechanical collimator with electronic-collimation. The combination offers both efficiency and good angular resolution, and is unique since a single gamma ray can contribute information to both modalities simultaneously. The mechanically collimated camera is most effective for imaging lower energy photons while electronic collimation uncouples spatial resolution from efficiency for higher energies. Our proposed Dual Aperture Gamma Imager (DAGI) combines a high-resolution URA coded aperture with a Compton scatter camera to provide a broader range of energy response suitable for a wider range of industrial applications (50keV-2MeV). The primary detector is a large area LaCl3:Ce scintillator coupled directly to a Hammamatsu PSPMT, chosen to provide portability, efficiency and energy resolution. A pixellated CsI(Na)/PSPMT combination serves as the secondary absorption detector. Point and ring shaped radiation sources (140, 364, 662 and 1275 keV) are simulated. The results show that DAGI can cover a broad energy range of radiation and the combined dual collimation image, using the maximum likelihood method for image reconstruction, yields better images than either a mechanical or electronic image at intermediate energies. The sensitivity loss of the Compton imager due to the introduction of the mechanical collimator is discussed.

Original languageEnglish
Title of host publicationIEEE Nuclear Science Symposium Conference Record
Pages505-509
Number of pages5
Volume1
DOIs
Publication statusPublished - 2005 Dec 1
Externally publishedYes
EventNuclear Science Symposium Conference Record, 2005 IEEE - , Puerto Rico
Duration: 2005 Oct 232005 Oct 29

Other

OtherNuclear Science Symposium Conference Record, 2005 IEEE
CountryPuerto Rico
Period05/10/2305/10/29

Fingerprint

Image sensors
Gamma rays
Radiation
Cameras
Detectors
Image reconstruction
Imaging systems
Phosphors
Maximum likelihood
Industrial applications
Photons
Imaging techniques

ASJC Scopus subject areas

  • Computer Vision and Pattern Recognition
  • Industrial and Manufacturing Engineering

Cite this

Lee, W. H., & Wehe, D. K. (2005). Simulation results of a dual aperture gamma ray imager. In IEEE Nuclear Science Symposium Conference Record (Vol. 1, pp. 505-509). [1596303] https://doi.org/10.1109/NSSMIC.2005.1596303

Simulation results of a dual aperture gamma ray imager. / Lee, Won Ho; Wehe, David K.

IEEE Nuclear Science Symposium Conference Record. Vol. 1 2005. p. 505-509 1596303.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Lee, WH & Wehe, DK 2005, Simulation results of a dual aperture gamma ray imager. in IEEE Nuclear Science Symposium Conference Record. vol. 1, 1596303, pp. 505-509, Nuclear Science Symposium Conference Record, 2005 IEEE, Puerto Rico, 05/10/23. https://doi.org/10.1109/NSSMIC.2005.1596303
Lee WH, Wehe DK. Simulation results of a dual aperture gamma ray imager. In IEEE Nuclear Science Symposium Conference Record. Vol. 1. 2005. p. 505-509. 1596303 https://doi.org/10.1109/NSSMIC.2005.1596303
Lee, Won Ho ; Wehe, David K. / Simulation results of a dual aperture gamma ray imager. IEEE Nuclear Science Symposium Conference Record. Vol. 1 2005. pp. 505-509
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