Investigation of the Field Size Effect on Wedge Field Isodose Curves Angle for Two Energies;6MV&18MV,produced by VARIAN 2100C Linac
Nowadays,considerable developments in the field of radiotherapy have been achieved.However,the conventional techniques requiring wedge are still being used.One of the wedge parameters needed to be measured is the wedge angle.In this study,the variation of wedge angle for different field sizes was evaluated using dosimetric and mathematical method.For the wedge fields with a dimension of 6×6cm2 to 20×20 cm2,the wedge angle for two photon energies of 6 and 18 MV was measured by dosimetric method.For these measurements,the conventional wedges having the nominal wedge angle of 15,30,45 & 60 were used.The theoretical method suggested by Saw et al.is also used to indirectly calculate the slope of isodose curve by the dose profile and percent depth dose data.The dose profile,percentage depth dose and isodose curves were drawn for all the field sizes and the tilt of isodose curve at 10 cm depth,according to international definition,is considered as the wedge angle.
Wedge Angle Isodose Curve Profile Curve PDD Curve
D. Khezrloo M.J. Tahmasebi Birgani
Department of Medical physics, School of Medicine, Tehran University of Medical Sciences Department of Radiation therapy, Associated prof. , Ahwaz, Iran
国际会议
World Congress on Medical Physics and Biomedical Engineering (2012年医学物理及生物医学工程国际会议(IFMBE))
北京
英文
1715-1718
2012-05-26（万方平台首次上网日期，不代表论文的发表时间）