Journal of Radiation Protection and Research

The Korean Association for Radiation Protection (대한방사선방어학회)
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Manufacture of Immobilization Device (Vac-lok) and the Usefulness of Evaluation for Reproducibility of Patients in the Radiotherapy

환자의 재현성을 위한 고정장치(Vac-lok) 제작과 방사선치료에서 유용성 평가

  • Lee, Jae-Seung (Department of Radiation Oncology, Good Samaritan Hospital) ;
  • Kim, Gyoung-Hee (Department of Radiologic Technology, Sunlin University) ;
  • Jeong, Kyu-Hwan (Department of Radiologic Technology, Sunlin University) ;
  • Kweon, Dae-Cheol (Department of Radiologic Science, Shin Heung College University) ;
  • Goo, Eun-Hoe (Department of Radiology, Seoul National University Hospital) ;
  • Park, Cheol-Woo (Department of Radiological Technology, Dong Eui Institute of Technology) ;
  • Im, In-Chul (Department of Radiological science, Dong Eui University) ;
  • Dong, Kyung-Rae (Department of Radiological Technology, Gwangju Health College University) ;
  • Chung, Woon-Kwan (Department of Nuclear Engineering, Chosun University)
  • Received : 2011.01.26
  • Accepted : 2011.03.22
  • Published : 2011.03.30
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Abstract

We manufactured the Vac-lok that can be applied to patient of special body shape and need to special set-up position and evaluated the usefulness in the radiation therapy. The manufacture Vac-lok, It was used EVA resin and biobeadform of a diameter 1.5 mm. carried out the test of functionality, structural and analyzed the relative reproducibility of phantoms and patients. During the total period of radiation therapy, Vacuum pressure bring variety to a very small amount in the test of functionality of the manufacture Vac-lok. But It was a negligible quantity. The manufacture Vac-lok improved the relative reproducibility of phantoms than the existing Vac-lok and tolerance has a confidence less than 4% error. Also, relative reproducibility of patient increased error than phantom in the antero-posterior and lateral plan. However, the maximum set-up error was less than ${\pm}\;2.3$ mm. In conclusion, If tolerance set-up error of radiotherapy is less than ${\pm}\;3$ mm, the manufacture Vac-lok was enough possible to use and improvement of reproducibility, considering supply with the Vac-lok made to measure of special patient that produced at a low price and without delay.

방사선치료에서 특수한 체형을 갖거나 특별한 자세가 요구되는 환자에게 적용할 수 있으며 환자의 위치결정 및 조사영역 내에서 표적체적의 위치 재현성을 향상시킬 수 있는 고정 장치(Vac-lok)를 제작하고 그 유용성을 검증하였다. EVA 합성수지와 1.5 mm 바이오 비드폼을 이용하여 제작된 Vac-lok의 기능적, 형태적 검사를 시행하고 모형 및 환자의 상대적 재현성을 분석하였다. 전 방사선치료 기간 동안 제작된 Vac-lok의 기능적 검사에서 미소한 진공 압력의 변화는 있었으나 무시할 정도로 작았다. 모형의 상대적 재현성은 기존 상품화된 제품보다 재현성이 향상되었으며 평균 4% 미만의 오차를 보였다. 또한 환자의 상대적 재현성에서 전후 또는 측면방향에서 다소 오차가 증가하였으나 최대 ${\pm}\;2.3$ mm 미만이었다. 결론적으로 방사선치료의 한계 오차를 ${\pm}\;3$ mm 미만이라 할 때 임상적으로 충분하게 사용 가능하였고 재현성의 향상과 특수한 환자에게 맞춤형 고정 장치를 가격이 저렴하면서 신속하게 제공할 수 있을 것으로 사료된다.

Keywords

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