Daily check device manufacture and efficiency Evaluation for daily Q.A

일일 정도관리를 위한 Daily check device 의 제작 및 효율성 평가

Introduction: Daily Q.A is the important step which must be preceded in a radiation treatment. Specially, radiation output measurement and laser alignment, SSD indicator related to a patient set-up recurrence must be confirmed for a reasonable radiation treatment. Daily Q.A proceeds correctness and a prompt way, and needs an objective measurement basis. Manufacture of the device which can facilitate confirmation of output measurement and appliances check at one time was requested. Methods and Materials: Produced the phantom formal daily check device which can confirm a lot of appliances check (output measurement and laser alignment, field size, SSD indicator) with one time of set up at a time, and measurement observed a linear accelerator (4 machine) for four months and evaluated efficiency. Result: We were able to confirm an laser alignment, field size, SSD indicator check at the same time, and out put measurement was possible with the same set up, so daily Q.A time was reduced, and were able to confirm an objective basis about each item measurement. As a result of having measured for four months, output measurement within ${\pm}\;2\%$, and measured laser alignment, field size, SSD indicator in range within ${\pm}\;1mm$. Conclusion: We can enforce output measurement and appliances check conveniently and time was reduced and was able to raise efficiency of business. We were able to bring n cost reduction by substitution expensive commercialized equipment. Further It is necessary to makes a product as strong and slight materials, and improve convenience of use.

방사선 종양학과에서 실시하고 있는 일일 정도관리 항목인 out put laser alignment, field size, SSD indicator 점검을 간편하고 정확하게 할 수 있도록 phantom 모양의 daily check device를 설계하고 제작하였다. 본 장치를 사용하여 4개월(2005. $2\~5$)월 동안 4대의 선형가속기 일일 정도관리에 사용한 곁과 측정과정이 편리하고 시간이 단축되어 일일점검의 효율성이 향상 되었고, 출력선량 측정은 각 장비별로 ${\pm}\;2\%$ 이내였으며 laser, field size, SSD indicator 는 ${\pm}\;1mm$ 이내의 범위에서 측정되었다. 일일 정도관리 기록을 기초로 하여 월간, 연간 정도관리의 객관적인 기초 자료로 활용할 수 있었다. 제작된 daily check device는 기존 상품화된 고가의 측정 장비를 대체 사용가능하게 함으로써 비용절감 효과가 기대되며, 향후 장치 재질의 견고성 및 가벼운 소재의 개발이 필요할 것으로 사료된다.