한국의학물리학회지:의학물리 (Progress in Medical Physics)
- 제12권1호
- /
- Pages.95-102
- /
- 2001
- /
- 2508-4445(pISSN)
- /
- 2508-4453(eISSN)
방사선 강내치료를 위한 소조사면 전자선cone의 선량분포 특성
Fabrication and Dosimetry Characteristics of Intracavitary Cones for Radiotherapy
초록
방사선치료용 고 에너지 전자선의 조직내 선량분포는 매우 다양하게 나타나고 있으며 조직내에서 일정 깊이까지만 선량이 집중적으로 부여되고 그 이후에는 선량이 급감하는 특징으로 인하여 피부 및 피부에서 깊지않은 종양과 구강, 질강 등 강내조사에 존재하는 종양치료에 널리 이용되고 있다. 하지만 의료용 선형가속기에는 강내조사용 조사통(cone)이 제공되지 않고 있다. 본 실험은 2.5, 3.0, 3.5 cm ø 크기의 강내조사용 소조사면 조사통을 수직형과 30
The intracavitary cones were designed which were made of stainless steel and have scratched inside cone to be generated electron scatter and designed to be attached easily to the LINAC collimator and controlled cones length to be contacted smoothly between the patient and the cone tip. Two types of intracavitary cones were designed. One is the straight end cones with circular opening on the distal end and the other is 30 degree beveled end cones with elliptical opening on the distal end. Each type of intracavitary cone ranged in daimeter from 2.5 cm to 3.5 cm and required a separate set of lower trimmer annulias cone diameter. The film phantom was designed with an internal cassette that accurately aligned the film edge with the film phantom surface. Film optical density data were measured by photodensitometer(Wellhofer 700i) Dosimetry measurements were made to commission the LINAC for 6 - 20 MeV electron using the intracavitary cones. Isodose curves were measured for all energy and cones combinations. Output is defined as the maximum dose per MU along the clinical central axis in water at 113 cm SSD. Calibration output, defined to be the output for the 15cm