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Conventionally, Specific Absorption Rate (SAR) to a cancer tumor is estimated using an inaccurate water phantom method in hospitals. In this paper, we propose an accurate SAR estimation method using Finite Difference Time Domain (FDTD) technique. The FDTD method is employed in calculating the absorption of electromagnetic energy within complex, lossy dielectric human tissues. In this work, the tumor...
This work presents the application of an updated version of an existing Monte Carlo (MC) code for photon and electron transport to intraoperative radiotherapy (IORT) dose planning. The code has been optimized to provide an estimation of the dose delivered by the linear accelerator (LINAC) in very short time and has been incorporated as a submodule of an advanced IORT planning system under development,...
Linear accelerator accurate simulation is the prerequisite of Monte Carlo dose calculation algorithm. The study simulated 6MV photon beam produced by Varian 600C medical linear accelerator to derive the mean energy and the full-width half-maximum (FWHM) of incident electron beam intensity distribution (assumed Gaussian distribution) with BEAMnrc and DOSXYZnrc by matching calculated and measured depth...
Experience during percutaneous ion beam therapy at Gesellschaft für Schwerionenforschung showed that the treatment can be improved by in-vivo dose monitoring that is independent of the irradiation device and based on positron emission tomography. It has been studied whether a similar technique can be implemented for high energy photon therapy. Simulation shows that the dose is closely related to...
Cancer therapy with electrons requires a well defined electron beam. Especially a flat dose profile in the tissue is important for the treatment planning. The normal, healthy tissue should be harmed as little as possible. Therefore the understanding of the physical properties behind the linear accelerator is of outstanding importance. A simulation provides an elegant access to the track of the electrons...
This work presents Vibro-acoustography (VA) as a tool to visualize absorbed dose distributions in a polymer gel dosimeter. VA uses the radiation force of focused ultrasound to vibrate a small region of the sample. Different modalities of VA were used to investigate the feasibility of this technique to evaluate dose distribution in irradiated `MAGIC' polymer gel. A phantom was designed using this polymer...
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