A radiation treatment planning, which was calculated using Radiation Treatment Planning Systems (RTPS) has been unsuccessful in the correct calculation of dose perturbations for high-density substances. High-density metal objects such as prosthetic dental implants, metal hip prosthesis, and others are implanted occasionally into human bodies. In this work, the dose distributions inside a tough water phantom with titanium irradiated by 4 MV and 10 MV photon beams for a 5 x 5 cm2field size were evaluated. Dose distributions were measured using Gafchromic Film RT-QA and calculated by Monte Carlo (MC) simulation or RTPS. By these evaluations, we investigated the accuracy of the calculation using RTPS for the existence of titanium. Depth-dose profiles obtained using the film and the MC simulation agreed within · 5 %. The rate of changes (RC) between the MC simulations and the RTPS calculations were -13.2 % (4 MV) or -17.2 % (10 MV) in front of titanium, and 15.8 % (4 MV) or 3.9 % (10 MV) at behind of titanium (shown in Table 1), where RC (%) = ((Dxio - DEGS) / DEGS) x 100, D is relative dose. For the depth deeper than 7 cm, the results show no much difference.
|出版ステータス||Published - 2008|
|イベント||15th EGS Users' Meeting in Japan 2008 - Tsukuba, Japan|
継続期間: 06-08-2008 → 08-08-2008
|Conference||15th EGS Users' Meeting in Japan 2008|
|Period||06-08-08 → 08-08-08|
All Science Journal Classification (ASJC) codes