의학물리학

본문글자크기
  • [Med Phys.] Development of a dosimetry system for therapeutic X-rays using a flexible amorphous silicon thin-film solar cell with a scintillator screen

    [Med Phys.] Development of a dosimetry system for therapeutic X-rays using a flexible amorphous silicon thin-film solar cell with a scintillator screen 신틸레이터 스크린이 있는 플렉시블 비정질 실리콘 박막 태양전지를 이용한 치료용 X선 선량 측정 시스템 개발

    국립암센터 / 정성훈, 이세병*

  • 출처
    Med Phys.
  • 등재일
    2022 Apr 9. doi: 10.1002/mp.15664. Online ahead
  • 저널이슈번호
  • 내용

    바로가기  >

    이달의 연구자 바로가기 Click!

     

    Abstract
    Purpose: To evaluate the dosimetric characteristics and applications of a dosimetry system composed of a flexible amorphous silicon thin-film solar cell and scintillator screen (STFSC-SS) for therapeutic X-rays.

    Methods: The real-time dosimetry system was composed of a flexible a-Si thin-film solar cell (0.2-mm thick), a scintillator screen to increase its efficiency, and an electrometer to measure the generated charge. The dosimetric characteristics of the developed system were evaluated including its energy dependence, dose linearity, and angular dependence. Calibration factors for the signal measured by the system and absorbed dose-to-water were obtained by setting reference conditions. The application and correction accuracy of the developed system were evaluated by comparing the absorbed dose-to-water measured using a patient treatment beam with that measured using the ion chamber.

    Results: The responses of STFSC-SS to energy, field size, depth, and source-to-surface distance (SSD) were more dependent on measurement conditions than were the responses of the ion chamber, although the former dependence was due to the scintillator screen, not the solar cell. The signals of STFSC-SS were also dependent on dose rate, while the responses of solar cell alone and scintillator screen were not dependent on dose rate. The scintillator screen reduced the output of solar cell at 6 and 15 MV by 0.60 and 0.55%, respectively. The different absorbed dose-to-water measured using STFSC-SS for patient treatment beam differed by 0.4% compared to those measured using the ionization chamber. The uncertainties of the developed system for 6 and 15 MV photon beams were 1.8 and 1.7%, respectively, confirming the accuracy and applicability of this system.

    Conclusions: The thin-film solar cell-based detector developed in this study can accurately measure absorbed dose-to-water. The increased signal resulting from the use of the scintillator screen is advantageous for measuring low doses and stable signal output. In addition, this system is flexible, making it applicable to curved surfaces, such as a patient's body, and is cost-effective.

     

    본 연구에서 평가된 검출기는 태양전지에 신틸레이터 스크린을 결합한 형태입니다. 태양전지의 매우 얇은 물리적 특성을 살리기 위해 치료 분야에서는 잘 사용되지 않는 신틸레이터 스크린이 사용되었기 때문에 태양전지와 신틸레이터 스크린 각각의 선량 특성과 결합한 형태의 검출기의 선량 특성이 평가되었습니다.

     

     

    Affiliations

    Seonghoon Jeong  1 , Wonjoong Cheon  1 , Dongho Shin  1 , Young Kyung Lim  1 , Jonghwi Jeong  1 , Haksoo Kim  1 , Myonggeun Yoon  2 , Se Byeong Lee  1
    1 Proton Therapy Center, National Cancer Center, Goyang, Korea.
    2 Department of Bioconvergence Engineering, Korea University, Seoul, Korea.

  • 키워드
    amorphous silicon thin-film solar cell; dose evaluation; real time dosimetry; scintillator screen.
  • 연구소개
    본 연구는 amorphous silicon 기반의 태양전지를 이용하여 치료용 X-ray의 선량을 측정하고자 실시하였던 연구입니다. 방사선치료의 선량 측정에서 태양전지는 다른 검출기에 비해 생소한 편인데, 태양전지의 치료용 X-ray에 대한 선량적 특성을 파악하고 이를 통해 기존의 검출기들만큼 정확하게 원하는 지점의 선량을 파악하는 연구입니다.
  • 편집위원2

    솔라셀을 응용하여 방사선 측정기로 이용하려는 연구로 국내에서는 처음으로 시도되는 듯하다. 에너지나 심부선량등이 절대선량과는 차이가 있는 것으로 보이므로 교정계수를 사용할 수 밖에 없어보이지만, 연구가 잘 진행된다면 매우 얇은 선량계, 플렉서블한 선량계 등 응용범위가 클 것으로 기대됨

    2022-09-05 14:32:56

  • 덧글달기
    덧글달기
       IP : 18.234.139.149

    등록