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

Chao Guo; Jonathan Troville; Sheng-Hsuan Sun; Stephen Rudin; Daniel R. Bednarek

doi:10.1117/12.2549047

16 March 2020 Variation of eye-lens dose with variation of the location of the beam isocenter in the head during neuro-interventional fluoroscopic procedures

Chao Guo, Jonathan Troville, Sheng-Hsuan Sun, Stephen Rudin, Daniel R. Bednarek

Author Affiliations +

Proceedings Volume 11312, Medical Imaging 2020: Physics of Medical Imaging; 113123E (2020) https://doi.org/10.1117/12.2549047
Event: SPIE Medical Imaging, 2020, Houston, Texas, United States

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.

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Chao Guo, Jonathan Troville, Sheng-Hsuan Sun, Stephen Rudin, and Daniel R. Bednarek "Variation of eye-lens dose with variation of the location of the beam isocenter in the head during neuro-interventional fluoroscopic procedures", Proc. SPIE 11312, Medical Imaging 2020: Physics of Medical Imaging, 113123E (16 March 2020); https://doi.org/10.1117/12.2549047

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KEYWORDS

Eye

Head

Monte Carlo methods

Astatine

Optical simulations

Photons

Signal attenuation

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