Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2016, Vol. 27 ›› Issue (4): 93 doi: 10.1007/s41365-016-0088-4


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

Hossein Akbari-Lalimi 1,2 ,Seyed Ali Shafiei 3   

  1. 1 Geriatric Care Research Center, Rafsanjan University of Medical Sciences, Rafsanjan, Iran
    2 Department of Medical Physics, Mashhad University of Medical Sciences, Mashhad, Iran
    3 Department of Physiology and Pharmacology, School of Medicine, Qom University of Medical Sciences, Qom, Iran
  • Contact: Seyed Ali Shafiei
  • Supported by:

    This work was supported by grants from Rafsanjan University of Medical Sciences, Rafsanjan, Iran.

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Hossein Akbari-Lalimi, Seyed Ali Shafiei. Design feasibility of gamma camera without collimator based on specific arrangement of the detectors.Nuclear Science and Techniques, 2016, 27(4): 93     doi: 10.1007/s41365-016-0088-4


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 × 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° (0°–179°) 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.

Key words: Collimator, Gamma camera, SPECT, Monte Carlo simulation