چکیده

Abstract — a modified model-based algorithm algorithm is proposed to compute dose from the kilovoltage beams used in IGRT. The EGSnrc MC code was used to model the Elekta XVI unit and determine dose deposition characteristics of its kilovoltage beams. The dosimetric results were compared with experimental measurements. The dose from the kilovoltage beams was then computed using model-based algorithm along with material-specific energy deposition kernels and compared with MC simulation and measurements. The simulated PDD and beam profiles agreed well with practical measurements. The comparisons of the model-based algorithm with measurements in a homogenous solid water slab phantom, and that with Monte Carlo in a head and neck CT dataset produced acceptable results. The calculated point dose were within 3% of measurements in the homogeneous phantom. Gamma analysis of the calculated vs. Monte Carlo simulations in the head and neck phantom resulted in 95% of points passing with a 3%/3mm criteria. The proposed method offers sufficient accuracy in kilovoltage beams dose calculations and has the potential to supplement the conventional megavoltage convolution/superposition algorithms for dose calculations in low energy range.

کليدواژه ها

— Model-based dose calculation algorithm, material-specific energy deposition kernels, Monte Carlo simulation, kV dosimetry

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سید محمود رضا آقامیری , 1400 , A modified model-based algorithm for computing dose of kV x-ray beams , نخستین همایش بین المللی و سومین همایش ملی ریاضیات زیستی