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김유현,김창균,박장필 高麗大學校 倂設 保健大學 保健科學硏究所 2003 保健科學論集 Vol.29 No.1
The aim of this study is to develop a computer program which computes in-vivo doses from transmission doses measured during patient treatment using an ionization chamber. As the Kim's papaer, We adopted a straightforward empirical approach using a phantom transmission factor (PTF) which accounts for the contribution from all three factors. We develop the program which computes tumor doses by Microsoft Visual Basic Application program for D_(center) = D_(t)/PTF(d_(g), T_(p))×(SCD/SAD)²× BSF(r_(o))× S_(p)(r_(p,eff)) × TMR(d, r_(p,eff)). To make certain the accuracy of this program, we checked the accuracy for the following cases; in cases of regular or irregular field size, inhomogeneous material included. The errors were within 0.7% for regular field size, 2.5% irregular field size, 3.8% when inhomogeneous material was included in the phantom. It is considered that this program can make the quality control for dose at the time of radiation therapy because it is non-invasive that makes possible to measure the doses whenever a patient is given a therapy as well as eliminates the problem for entrance or exit dose measurement.