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http://dx.doi.org/10.7742/jksr.2018.12.4.467

Reduced Effect of kV-CBCT Dose by Use of Shielding Materials in Radiation Therapy  

Jo, Hyeonjong (Department of Radiation Oncology, Haeundae Paik Hospital, Inje University)
Park, Euntae (Department of Radiation Oncology, BuSan Paik Hospital, Inje University)
Kim, Junghoon (Department of Radiological Science, College of Health Sciences, Catholic University of Pusan)
Publication Information
Journal of the Korean Society of Radiology / v.12, no.4, 2018 , pp. 467-474 More about this Journal
Abstract
CBCT is useful for improving the accuracy of the treatment site, but Repeated use increases the exposure dose. In this study, we aimed to provide basic data for dose reduction in CBCT implementation by dataization the simulating and dose reduction effect using shielding substance. Material in this study, Analyzation the photon beam by simulate the CBCT Through MCNPX and then calculate the absorption dose of body organ at shooting moment of thoracic abdominal position as target UF-Revise simulated body. At this time. Dose reduction effects at this time were evaluated according to the texture of materials and presence of shielding materials( lead, antimony, barium, sulfate, tungsten, bismuth). When CBCT was taken without shielding, the dose was calculated to be high in the breast and spine, and the dose in the esophagus and lung was calculated to be low. The doses according to the shield material were calculated as barium sulfate, antimony, bismuth, lead, and tungsten. The shielding rate was the highest in the thymus (73.6%) and the breast (59.9%) compared with the dose reduction according to presence or absence of the shield. However, it showed the lowest shielding rate in lung (2.1%) and spine (12.6%).
Keywords
CBCT; Shielding; Absorbed dose; Dose reduction; Radiation therapy;
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