A feasibility study of the CTDI measurement by nMAG gel dosimeter

• Main Authors: Yu-Chen Yeh, 葉昱溱
• Other Authors: Jay Wu
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/nwt8d3

碩士 === 中國醫藥大學 === 臨床醫學研究所碩士班 === 102 === Computer tomography dose index (CTDI) measurement and slice width profile(SWP) assemsment are parts of acceptance test and quality assurance measurements of diagnostic x-ray CT scanners for the determination of patient dose. Normoxic polymer gel dosimeters have been proven it has the potential to measure dose and evaluate CTDI during acceptance testing. In this study, we used nMAG gel dosimeter to measure Computer tomography dose index (CTDI)and slice width profile(SWP). The 1.5T MRI scan with the head coil receiver was used to readout the dose information.The results shows the difference of CTDI100 calculated from the normoxic polymer gel dosimeter and 10 cm pencil ion chamber was in 10%. Full-width half-maximum(FWHM) values of slice width profiles from the normoxic polymer gel dosimeter were compared to FWHM values from Gafchromic film, the difference was in 10%. We conclude that polymer gel dosimeters shows great potential as a technique to assess dose distribution of computed tomography.