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선형가속기의 선량율에 따른 쐐기필터의 선량분포

Dose Distribution of Wedge filter by Dose Rate in LINAC

  • 권태형 (강원대학교 교학지원과) ;
  • 김승욱 (대구보건대학교 방사선과) ;
  • 윤용학 (대구보건대학교 방사선과) ;
  • 원도연 (대구보건대학교 방사선과) ;
  • 정경환 (대구보건대학교 방사선과) ;
  • 정재은 (대구보건대학교 방사선과) ;
  • 조준호 (케어캠프(주) 방사성의약품제조팀)
  • Gwon, Taehyeong (Department of Administration team, Kangwon Natinal University) ;
  • Kim, Seunguk (Department of Radiological Science, Daegu Health College) ;
  • Yoon, Yonghak (Department of Radiological Science, Daegu Health College) ;
  • Won, Doyeon (Department of Radiological Science, Daegu Health College) ;
  • Jeong, Kyeonghwan (Department of Radiological Science, Daegu Health College) ;
  • Jung, Jaeeun (Department of Radiological Science, Daegu Health College) ;
  • Cho, Juneho (Department of Radiopharmaceutical team, Carecamp(inc.))
  • 투고 : 2015.07.22
  • 심사 : 2015.08.25
  • 발행 : 2015.06.30

초록

이 연구는 금속쐐기필터를 대신하여 동적쐐기필터를 사용할 수 있을지에 대한 적정성 평가에 관한 것이다. 선형가속기에서 발생되는 엑스선 에너지는 6 MV, 10 MV로 상용화되어있다. 금속쐐기필터의 $15^{\circ}$, $30^{\circ}$, $45^{\circ}$, $60^{\circ}$에 각각 100, 200, 300, 400, 500, 600 선량율(MU/min)로 48번 조사하였고, 동적쐐기필터와의 비교를 위해 같은 조건으로 총 96번 조사하였다. 측정조건은 선원필름간 거리 100cm, 조사면 $10{\times}10cm$ 로 측정하였다. 현상된 필름을 스캔하여 선량분석프로그램으로 교정 후 분석하였고, 표준편차를 구해 선량율을 비교하였다. 동적쐐기필터는 선량, 산란선 및 치료시간을 감소시키며, 환자에 조사되는 선량이 적어 매우 유용하다. 동일한 조건에서 선량율에 따른 오차는 연관성이 없으므로 환자의 상황에 따라 고선량율의 치료를 사용하는 것도 가능할 것으로 생각된다.

This study is aimed at assessing whether dynamic wedge filters are appropriate to be used instead of physical wedge filters. The X-ray energy generated from linear accelerator is commercialize 6 MV and 10 MV. $15^{\circ}$, $30^{\circ}$, $45^{\circ}$, and $60^{\circ}$ of physical wedge filter was irradiated by dose rate 100, 200, 300, 400, 500, and 600 MU/min for each angle and for comparison with a dynamic wedge filter, irradiate 96 times under the same conditions. The measurement conditions are as 100 cm source-film distance and $10{\times}10cm$ irradiated surface. A developed film was scanned and analyzed after a calibration through a dose analysis program and the dose rate was compared after calculating the standard deviation. Dynamic wedge filters make dose, scattered rays and treatment time reduced and very useful due to less irradiated doses to patients. The errors at each dose rate under the same conditions were irrelevant. Thus, treatment based on a high dose rate depending on the patient is expected to be feasible.

키워드

참고문헌

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