Simulation of Human Eye for Ophthalmic Brachytherapy Dosimetry Using MCNP-4C Code

Abstract

This paper proposes study through which human eye with tumour (choroidal melanoma) has been simulated through with MCNP-4C code. The simulation is done by using a three dimensional method in the most general manner possible (taking in to consideration different parts of the eye like: Lens, cornea, retina, choroid, sclera, anterior chamber, optic nerve and tumour). That is to say that all the said parts have been simulated in a manner that the final result could be the complete and exact simulation of the eye globe. Dose distribution in some parts of the eye has been determined and the central axis depth-dose curves for one ¹²⁵I seed in the central slot of Modulay or pure gold plaque has been calculated and comparison has been made afterwards to those calculated by Thomson et al. the results have shown good agreement. Besides, mean absorbed dose values due to both Iodine source (16mm, 12mm) were obtain for each one of the different structures which compose the eye model and can give relevant information in eventual clinical analyses.