Surface Dose and Transmission Factor for Vacuum Cushion
Vacuum Cushion 사용시 표면선량과 투과율 평가
김, 미화; 이, 병용; 전, 미선
Ŭihak mulli, 13(2):74-78, 2002
Ŭihak mulli; Korean journal of medical physics; 의학물리
The individual (customized) immobilization has been used to reproduce the patients' set-up on daily base. There are many various devices available commercially. To evaluate dosimetric characteristics of vacuum cushion, we analysed the surface dose and transmission factor for d when patient is immobilized with vacuum cushion. Experiments were performed with 4 MV (Varian 4/100, USA), 6 MV, 15 MV (Varian CL2100C/D, USA) photon beams and five field sizes (55, 1010, 2020, 3030, 4040 ) on each occasion. Outputs were measured from surface of polysterene phantom to d with four different thicknesses of cushion, which is 12, 32, 48 mm and only vinyl without styroforms. As results, the transmission factor for thicknesses of vacuum cushion was ranged from 0.9953 to 1.0043. The more the thickness of vacuum cushion is thick, the more surface dose delivered to patient is increased. The surface dose vary with the thickness of vacuum cushion for energy and field size. The skin reactions may result. But the variation is not serious in the clinic.
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