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Preliminary Monte Carlo Investigation of Using Ir-192 as the Source for Real Time Imaging Purpose

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Document pages: 11 pages

Abstract: The purposeof this study is to investigate the potential use of Ir-192 as the source forreal time imaging during HDR (High Dose Rate) brachytherapy treatment. Phantommeasurement was performed to determine outside of the body dose. Monte Carlocode, EGSnrcMP egs inprz, was used for the simulation to calculate the outsideof the body x-ray signal for CT reconstruction. Matlab code was developed toreconstruct the Ir-192 source and for 3D visualization in order to assessreconstructed CT resolution, signal-to-noise ratio, and imaging doseinformation. The measured dose was 0.67 ± 0.04 cGy, which was comparable to theMonte Carlo simulation result 0.71 ± 0.20 cGy. The reconstructed sourcediameter dimension was 1.3 mm compared with 1.1 mm for the real source dimension.The signal-to-noise ratio was 19.91 db following de-noising. Source positionwas within a 1 mm difference between programmed and simulated results. Althoughthe Ir-192 signal is weak for CT imaging, it is possible to use it as a CTimaging x-ray source for HDR treatment localization, verification and dosimetrypurposes. Further study is needed for the detailed design of an outside of thebody CT-like device for use in brachytherapy imaging.

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