Indian Journal of Nuclear Medicine
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Year : 2019  |  Volume : 34  |  Issue : 1  |  Page : 24-26

Evaluation of acceptance angle in iodine-131 single photon emission computed tomography imaging with monte carlo simulation

1 Department of Physics, LPHE, Modeling and Simulations, Faculty of Science, Mohammed V University, Rabat, Morocco
2 Department of Medical Physics, Academic Hospital of Udine, Udine, Italy

Correspondence Address:
Dr. Youssef Bouzekraoui
Department of Physics, LPHE, Modeling & Simulations, Faculty of Science, Mohammed V University, Rabat
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/ijnm.IJNM_109_18

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Introduction: In iodine-131 (I-131) imaging, the image quality is degraded by scatter and penetration in a collimator. In this work, we assessed the penetrated and the scattered photon fractions in the photopeak energy window using Monte Carlo Simulation code. Materials and Methods: The Siemens Medical System equipped with high-energy collimator was simulated. We evaluated the acceptance angle values on geometric, penetration, and scatter components in a separate file. Binary images in a data file are obtained and each one of them was imported in software ImageJ. Full-width at half-maximum (FWHM) and sensitivity were calculated and compared. Results: The simulation data show that for the acceptance angle value equal to 4.845°, the geometric, scatter, and penetration components were 93.20%, 4.13%, and 2.67%, respectively. Moreover, the resolution is improved (FWHM = 7.21 mm, full width at tenth maximum = 12.36 mm) for a point source at 12 cm from the detector. Conclusion: The small acceptance angle has a major impact on the image quality in I-131 single photon emission computed tomography.

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