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Feasibility Study of a Simple Approximation Algorithm for In-vivo Dose Reconstruction by Using the Transit Dose Measured Using an EPID
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The purpose of this study is to verify the accuracy of the dose delivered to the patient during
intensity-modulated radiation therapy (IMRT) by using in-vivo dosimetry and to avoid accidental
exposure to healthy tissues and organs close to tumors. The in-vivo dose was reconstructed by
back projection of the transit dose with a simple approximation that considered only the percent
depth dose and inverse square law. While the average gamma index for comparisons of dose distributions
between the calculated dose map and the film measurement was less than the one for
96.3% of all pixels with the homogeneous phantom, the passing rate was reduced to 92.8% with the
inhomogeneous phantom, suggesting that the reduction was apparently due to the inaccuracy of the
reconstruction algorithm for inhomogeneity. The proposed method of calculating the dose inside
a phantom was of comparable or better accuracy than the treatment planning system, suggesting
that it can be used to verify the accuracy of the dose delivered to the patient during treatment.
Ui-Jung Hwang and Mi Hee Song
Department of Radiation Oncology, National Medical Center, Seoul, Korea
Tae Seong Baek and Eun Ji Chung
Department of Radiation Oncology, National Health Insurance Corporation Ilsan Hospital, Ilsan, Korea
Myonggeun Yoon?
Department of Bio-convergence Engineering, Korea University, Seoul 136-703, Korea
Journal of the Korean Physical Society, Vol. 66, No. 4, February 2015, pp. 694∼699