Repository of Research and Investigative Information

Repository of Research and Investigative Information

Rafsanjan University of Medical Sciences

Design feasibility of gamma camera without collimator based on specific arrangement of the detectors

(2016) Design feasibility of gamma camera without collimator based on specific arrangement of the detectors. Nuclear Science and Techniques. p. 7. ISSN 1001-8042

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In gamma camera and single-photon emission computerized tomography, the collimator removes most photons. Here, a gamma camera without collimator utilizes a specific arrangement of detectors. Instead of bending beams (like a lens) or directing beams (by parallel hole collimator), changes are created in detectors' field of view (FOV), so that each detector's FOV looks different from others. Simulation proved this theory, with 98 detectors (2 cm x 1.41 cm) arranged in a zigzag manner for Monte Carlo simulation. A radioactive source with energy of 140 keV was situated on the detectors' faces. Sixty projections, each 3 degrees (0 degrees-17 degrees) apart, were simulated by Monte Carlo N-Particle (MCNP) 4C code, rotating detectors around a radioactive point. The band containing the radioactive source is clearly visible in each projection. Counts obtained after simulation in different projections were reconstructed, and point source location emerged correctly. Simulation of gamma camera with zigzag arrangement of detectors and MCNP-4C code demonstrated that one could string the space and determine radioactive source by image reconstruction without using collimators, solely through these special detectors' distribution.

Item Type: Article
Keywords: Collimator Gamma camera SPECT Monte Carlo simulation slit-slat collimator high-resolution monte-carlo beam collimator pinhole spect older-adults sensitivity scintimammography optimization penetration Nuclear Science & Technology Physics
Page Range: p. 7
Journal or Publication Title: Nuclear Science and Techniques
Journal Index: ISI
Volume: 27
Number: 4
Identification Number:
ISSN: 1001-8042
Depositing User: مهندس مهدی شریفی

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