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A Study of Dose to the Eye Lens of Interventional Radiologist Using MCNP Code and Multi Resolution Phantom Coupled with Eyeglasses Model

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X Xu

L Mao1*, T Liu1 , H Lin1 , P Caracappa1 , Y Gao2 , L Dauer2 , X Xu1 , (1) Rensselaer Polytechnic Institute, Troy, New York, (2) Memorial Sloan-Kettering Cancer Center, New York, NY


TU-C3-GePD-I-1 (Tuesday, August 1, 2017) 10:30 AM - 11:00 AM Room: Imaging ePoster Lounge

Purpose: To assess the eye lens dose to interventional radiologists wearing protective eyeglasses and to study the geometric factors affecting the dose, including shape of the glasses, lead-equivalent thickness and distance to the face. To evaluate different variance reduction techniques to improve the efficiency of Monte Carlo simulation.

Methods: The computational human phantom RPI Adult Male (RPI-AM) coupled with a high-resolution eye model was used to simulate a radiologist in fluoroscopically guided interventional procedure. Protective eyeglasses modeled by Constructive Solid Geometry (CSG) were integrated into the multi-resolution phantom. The simulation was repeated under different geometric parameters factors. The Monte Carlo code MCNP6.1 was used to simulate the X-ray source and particle transport in the transcatheter arterial chemoembolization procedure. Several variation reduction methods were explored including DXTRAN, geometry splitting and forced collisions to improve the figure of merit (FOM) of the simulation.

Results: It was found that the protective eyeglasses can effectively reduce the dose of eye lens. The average energy deposition per photon in eye lens decreased by 53.6% when a pair of eyeglasses with lead-equivalent of 0.5 mm Pb was added to the phantom. Examination of eyeglass features revealed that the distance between the eyeglasses and face has a significant effect on the eye lens dose due to the scattered X-ray from underneath and the side. The average energy deposition in eye lens dropped by 33.3% when the distance decreased from 1 cm to 0.5 cm. It was also found that the effect of the side shielding of the eyeglasses is closely related to the distance of the glasses.

Conclusion: The efficacy of the protective eyeglasses for interventional radiologists is sensitive to geometric factors. Variance reduction is an essential tool to the Monte Carlo simulation involving our high-resolution eye model.

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