Evaluation of Acceptance Angle in Iodine-131 Single Photon Emission Computed Tomography Imaging with Monte Carlo Simulation
| Autor: | Faustino Bonutti, Farida Bentayeb, Youssef Bouzekraoui, Hicham Asmi |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Photon
Image quality business.industry Point source Monte Carlo method Detector Acceptance angle penetration Collimator I-131 simulation Monte Carlo imaging nuclear detector scatter law.invention Full width at half maximum Optics law Medicine Original Article Radiology Nuclear Medicine and imaging geometrical business |
| Zdroj: | Indian Journal of Nuclear Medicine : IJNM : The Official Journal of the Society of Nuclear Medicine, India |
| ISSN: | 0972-3919 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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