치료 보조기구 사용 시 후 방향 피부선량 측정

Measurement of Skin Dose from Using the Treatment Immobilization Devices

본 연구는 인체 팬텀(alderson rando phantom)의 등쪽에 원통형 전리함을 부착하여 방사선 치료 조사야 내 환자와의 접촉 물질과 조사 야의 크기, 방사선 입사각도에 따른 피부 후 방향 선량 변화를 조사하였다. 연구 결과 테니스 라켓 줄(tennis racket)의 마일러(mylar)를 기준으로 첫째 : 조사야 10×10 cm2 기준으로면(cotton)은 약 2%, breast board는 약 8%, 15×15 cm2에서는 약 6%, 20×20 cm2는 약 10% 증가하였으며,5×5 cm2에서는 약 13% 정도 감소하였다. 둘째 : 방사선 입사각도가 0°로 기준으로 하여 5°에서는 breast board 0.4%, tennis racket 0.5%, cotton 1.1%, 10°에서는 breast board 1.5%, tennis racket 1.9%, cotton 2.6%, 15°에서는 breast board 3.9%, tennis racket 2.6%, cotton 3.86% 감소하였다. 결과적으로 carbon 재질의 치료보조기구는 피부표면선량의 크게 증가하므로 치료조사야 내에서는 피부와의 접촉을 피해야 한다.

The research was about the relation between the dorsal side dose measured by using the phantom body (Alderson Rando Phantom) and factors like contacted material of the patients, the size of the field, angle of incidence. Compared with mylar (tennis racket), the dose on 10×10 cm2 field size of cotton was increased by 2% and by 8% in the case of breast board. In the case of 15×15 cm2 field size, the dose was increased by 6% compared with 10×10 cm2 size. The field size of 20×20 cm2 resulted in 10% increase of dose, while 5×5 cm2 produced 13% decrease. Compared with incident angle 0°, the cases for the incident angle 5° had 0.4% less dose for breast board, 0.5% for tennis racket, 1.1% for cotton. The cases for the incident angle 10° had 1.5% less dose for breast board, 1.9% for tennis racket, 2.6% for cotton. For the incident angle 15°, breast board, tennis racket, cotton caused decrease of dose by 3.9%, 2.6%, 3.86% respectively. Resultantly carbon material can cause more skin dose in treatment field. By the results of this study, we recommend that one should avoid the contact between the carbon material and skin.