Phurailatpam Reena, Upreti Rituraj, Nojin Paul Siji, Jamema Swamidas V, Deshpande Deepak D
Radiation Oncology Department, ACTREC, TMC, India.
Medical Physics Department, TMH, TMC, India.
Phys Med. 2016 Jan;32(1):208-12. doi: 10.1016/j.ejmp.2015.08.009. Epub 2015 Oct 23.
The present study was to investigate the use of MOSFET as an vivo dosimeter for the application of Ir-192 HDR brachytherapy treatments.
MOSFET was characterized for dose linearity in the range of 50-1000 cGy, depth dose dependence from 2 to 7 cm, angular dependence. Signal fading was checked for two weeks.
Dose linearity was found to be within 2% in the dose range (50-1000 cGy). The response varied within 8.07% for detector-source distance of 2-7 cm. The response of MOSFET with the epoxy side facing the source (0 degree) is the highest and the lowest response was observed at 90 and 270 degrees. Signal was stable during the study period.
The detector showed high dose linearity and insignificant fading. But due to angular and depth dependence, care should be taken and corrections must be applied for clinical dosimetry.
本研究旨在探讨将金属氧化物半导体场效应晶体管（MOSFET）用作体内剂量计，用于铱-192高剂量率近距离放射治疗。
对MOSFET在50 - 1000厘戈瑞范围内的剂量线性、2至7厘米深度的剂量依赖性、角度依赖性进行了表征。检查了两周内的信号衰减情况。
在剂量范围（50 - 1000厘戈瑞）内，剂量线性在2%以内。对于2至7厘米的探测器 - 源距离，响应变化在8.07%以内。环氧面朝向源（0度）时MOSFET的响应最高，在90度和270度时观察到最低响应。在研究期间信号稳定。
该探测器显示出高剂量线性和不显著的衰减。但由于角度和深度依赖性，临床剂量测定时应谨慎并进行校正。
