:: Volume 22, Issue 7 (in press 2015) ::
Journal of Ilam University of Medical Sciences 2015, 22(7): 96-106 Back to browse issues page
Quantitative Evaluation of Radiation Scattering Effects on Quality of SPECT Images from Fan Beam Collimator using Monte Carlo Simulation
Hamidreza Baghani , Hasan Tavakoli * 1, Alireza Kamali Asl
1- , tavakoli@ibb.ut.ac.ir
Abstract:   (6824 Views)
Introduction: In this study, the effects of radiation scattering on quality of SPECT images acquired by Fan beam collimator have been quantitatively evaluated using Monte Carlo simulation. Materials & Methods: MCNP4C Monte Carlo code was used to simulate the imaging system. In order to evaluate the effects of radiation scattering on image quality, a water phantom was used. Line Spread Function (LSF) and Modulated Transfer Function (MTF) in presence and absence of this scattering Media were measured and compared with each other. Findings: The maximum difference between FWHM of LSF in presence and absence of scattering media was equal to 4%, while this difference for FWTM was13%. The maximum difference between spatial freq-uency at one-tenth of MTF’s maximum in presence and absence of scattering media was less than 2%, while this difference for spatial frequency at nine-tenth of MTF’s maximum was equal to 30%. Discussion & Conclusion: Regarding to the obtained results, it can be concluded that the radiation scattering considerably affects the image clarification, but its impact on image spatial resolution is negligible. In addition, the effects of radiation scattering are more evident in spatial frequency space.
Keywords: Radiation Scattering, Fanbeam Collimator, SPECT, Image Quality, Monte Carlo Simulation
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Type of Study: Research | Subject: Medical physics
Received: 2014/05/1 | Accepted: 2014/09/21 | Published: 2015/03/7


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Volume 22, Issue 7 (in press 2015) Back to browse issues page