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Analysis of Photon Characteristics and Absorbed Dose with Cone Beam Computed Tomography (CBCT) using Monte Carlo Method KCI 등재

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Journal of the Korean Society of Radiology (한국방사선학회논문지)
한국방사선학회 (The Korea Society of Radiology)
초록

The cone beam computed tomography(CBCT) which can acquire 3-dimensions images is widely used for confirmation of patient position before radiation therapy. In this study, through the simulation using the Monte Carlo technique, we will analyze the exposure dose by cone beam computed tomography and present the standardized data. For the experiment, MCNPX(ver. 2.5.0) was used and the photon beam spectrum was analyzed after Cone beam was simulated. As a result of analyzing the photon beam spectrum, the average energy ranged from 25.7 to 37.6 keV at the tube voltage of 80 ∼ 120 kVp and the characteristic X-ray energy was 9, 60, 68 and 70 keV. As a result of using the water phantom, the percentage depth dose was measured, and the maximum dose appeared on the surface and decreased with depth. The absorbed dose also decreased as the depth increased. The absorbed dose of the whole phantom was 9.7 ~ 18.7 mGy. This is a dose which accounts for 0.2% of about 10 Gy, which is generally used for radiation therapy per week, which is not expected to have a significant effect on the treatment effect. However, it should not be overlooked even if it is small compared with prescription dose

저자
  • Jong-Bo Kim(Department of Radiation Oncology, Dongnam Ins. of Radiological & Medical Science)
  • Jung-Hoon Kim(Department of Radiological science, college of health sciences, Catholic University of Pusan)
  • Eun-Tae Park(Department of Radiation Oncology, Inje University Busan Paik Hospital) Corresponding Author