A Monte Carlo study on the effect of the orbital bone to the radiation dose delivered to the eye lens

Andreas Stratis; Guozhi Zhang; Reinhilde Jacobs; Ria Bogaerts; Hilde Bosmans

doi:10.1117/12.2082029

18 March 2015 A Monte Carlo study on the effect of the orbital bone to the radiation dose delivered to the eye lens

Andreas Stratis, Guozhi Zhang, Reinhilde Jacobs, Ria Bogaerts, Hilde Bosmans

Proceedings Volume 9412, Medical Imaging 2015: Physics of Medical Imaging; 941231 (2015) https://doi.org/10.1117/12.2082029
Event: SPIE Medical Imaging, 2015, Orlando, Florida, United States

Abstract

The aim of this work was to investigate the influence of backscatter radiation from the orbital bone and the intraorbital fat on the eye lens dose in the dental CBCT energy range. To this end we conducted three different yet interrelated studies; A preliminary simulation study was conducted to examine the impact of a bony layer situated underneath a soft tissue layer on the amount of backscatter radiation. We compared the Percentage Depth Dose (PDD) curves in soft tissue with and without the bone layer and we estimated the depth in tissue where the decrease in backscatter caused by the presence of the bone is noticeable. In a supplementary study, an eye voxel phantom was designed with the DOSxyznrc code. Simulations were performed exposing the phantom at different x-ray energies sequentially in air, in fat tissue and in realistic anatomy with the incident beam perpendicular to the phantom. Finally, a virtual head phantom was implemented into a validated hybrid Monte Carlo (MC) framework to simulate a large Field of View protocol of a real CBCT scanner and examine the influence of scattered dose to the eye lens during the whole rotation of the paired tube-detector system. The results indicated an increase in the dose to the lens due to the fatty tissue in the surrounding anatomy. There is a noticeable dose reduction close to the bone-tissue interface which weakens with increasing distance from the interface, such that the impact of the orbital bone in the eye lens dose becomes small.

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Andreas Stratis, Guozhi Zhang, Reinhilde Jacobs, Ria Bogaerts, and Hilde Bosmans "A Monte Carlo study on the effect of the orbital bone to the radiation dose delivered to the eye lens", Proc. SPIE 9412, Medical Imaging 2015: Physics of Medical Imaging, 941231 (18 March 2015); https://doi.org/10.1117/12.2082029

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KEYWORDS

Bone

Tissues

Eye

Backscatter

Monte Carlo methods

Interfaces

Head

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