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Year : 2012  |  Volume : 11  |  Issue : 2  |  Page : 70-74

Monte carlo study of the effect of collimator thickness on T-99m source response in single photon emission computed tomography

1 Department of Medical Physics, Faculty of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran
2 Medical Physics Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
3 Department of Nuclear Medicine, Imam Reza's Hospital of Mashhad University of Medical Sciences, Mashhad, Iran
4 Department of Medical Radiation Physics, Clinical Sciences, Lund University, Lund, Sweden

Correspondence Address:
Jalil Pirayesh Islamian
Department of Medical Physics, Faculty of Medicine, Tabriz University of Medical Sciences, Tabriz
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Source of Support: Office of vice-president for research in Mashhad University of Medical Sciences, Mashhad, Iran., Conflict of Interest: None

DOI: 10.4103/1450-1147.103419

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In single photon emission computed tomography (SPECT), the collimator is a crucial element of the imaging chain and controls the noise resolution tradeoff of the collected data. The current study is an evaluation of the effects of different thicknesses of a low-energy high-resolution (LEHR) collimator on tomographic spatial resolution in SPECT. In the present study, the SIMIND Monte Carlo program was used to simulate a SPECT equipped with an LEHR collimator. A point source of 99m  Tc and an acrylic cylindrical Jaszczak phantom, with cold spheres and rods, and a human anthropomorphic torso phantom (4D-NCAT phantom) were used. Simulated planar images and reconstructed tomographic images were evaluated both qualitatively and quantitatively. According to the tabulated calculated detector parameters, contribution of Compton scattering, photoelectric reactions, and also peak to Compton (P/C) area in the obtained energy spectrums (from scanning of the sources with 11 collimator thicknesses, ranging from 2.400 to 2.410 cm), we concluded the thickness of 2.405 cm as the proper LEHR parallel hole collimator thickness. The image quality analyses by structural similarity index (SSIM) algorithm and also by visual inspection showed suitable quality images obtained with a collimator thickness of 2.405 cm. There was a suitable quality and also performance parameters' analysis results for the projections and reconstructed images prepared with a 2.405 cm LEHR collimator thickness compared with the other collimator thicknesses.

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