Abstract
To study the scatter factors during I-131 thyroid scintigraphic studies with a pinhole collimator (5mm hole) was developed a Monte Carlo (MC) simulation using GAMOS code. First, to check the accuracy of the Monte Carlo model, simulated and measured data using a thyroid phantom were compared. The accuracy of the Monte Carlo model was verified by the good agreement between measured and simulated energy spectra and the maximum discrepancies of 2% in the counts/sec/MBq. Next, simulations to investigate scatter were performed for different tissue thickness between the thyroid and collimator (5-15mm). The image’s scatter contribution was significant in the 5mm pinhole, being between 27-40%. On the basis of the separated scatter from direct count included in window energy spectra, a preliminary evaluation of multiple window energy correction methods was performed. For the simulated thyroid geometry with pinhole, the reduce inferior double energy window methods (15% on 364keV photopeak window) provides a reasonable correction for scatter. This study is the first approach; we recommend including real thyroid geometry with different thyroid depth-thickness and mass.
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© 2015 Springer International Publishing Switzerland
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Rodríguez, S., López, A., Díaz, A., Palau, A., Martín, J.M. (2015). Characterization of scatter factors in thyroid studies using a pinhole collimator by Monte Carlo Simulation.. In: Jaffray, D. (eds) World Congress on Medical Physics and Biomedical Engineering, June 7-12, 2015, Toronto, Canada. IFMBE Proceedings, vol 51. Springer, Cham. https://doi.org/10.1007/978-3-319-19387-8_44
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DOI: https://doi.org/10.1007/978-3-319-19387-8_44
Publisher Name: Springer, Cham
Print ISBN: 978-3-319-19386-1
Online ISBN: 978-3-319-19387-8
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