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Proceedings Paper

Variation of eye-lens dose with variation of the location of the beam isocenter in the head during neuro-interventional fluoroscopic procedures
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Paper Abstract

The lens of the eye can receive a substantial amount of radiation during neuro-interventional fluoroscopic procedures, increasing the risk of cataractogenesis for the patient. The purpose of this study is to investigate the variation of eye lens dose with a variation of the location of the beam isocenter in the head. The primary x-ray beam of a Toshiba (Canon) Infinix fluoroscopy machine was modeled using EGSnrc Monte Carlo code and the lens dose was calculated using 2 × 1010 photons incident on the anthropomorphic Zubal computational head phantom for each simulation. The Zubal phantom is derived from a CT scan of an average adult male and has internal organs, including the lenses, segmented for dose calculation. Computations were performed with the head shifted vertically +/- 4 cm and in the cranial-caudal and lateral directions incrementally up to 6 cm in either direction. At each position, the gantry was rotated to various LAO/RAO and CAU/CRA angles, both 5 cm × 5 cm and 10 cm x 10 cm entrance field sizes were used and the kVp was varied. The results show that substantial changes in lens dose occur when the head is shifted and can result in a dose difference between eyes of over 6 times at certain beam angles for the 5 cm × 5 cm field size. The results of this study should provide increased accuracy in lens dose estimation during neuro interventional procedures and, when incorporated into our real-time dose-tracking system, help interventionalists manage patient lens dose during the procedure to minimize risk.

Paper Details

Date Published: 16 March 2020
PDF: 11 pages
Proc. SPIE 11312, Medical Imaging 2020: Physics of Medical Imaging, 113123E (16 March 2020); doi: 10.1117/12.2549047
Show Author Affiliations
Chao Guo, The State Univ. of New York at Buffalo (United States)
Jonathan Troville, The State Univ. of New York at Buffalo (United States)
Sheng-Hsuan Sun, The State Univ. of New York at Buffalo (United States)
Stephen Rudin, The State Univ. of New York at Buffalo (United States)
Daniel R. Bednarek, The State Univ. of New York at Buffalo (United States)


Published in SPIE Proceedings Vol. 11312:
Medical Imaging 2020: Physics of Medical Imaging
Guang-Hong Chen; Hilde Bosmans, Editor(s)

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