Volume 51, Number 1, January-March 2016
|Page(s)||51 - 58|
|Published online||28 March 2016|
Characterization of optically stimulated luminescence for assessment of breast doses in mammography screening
Electrical and Computer Engineering Department, Faculty of
Engineering, King Abdulaziz University, Jeddah
2 Center of Radiation Protection and Training, King Abdulaziz University, Jeddah 21589, Saudi Arabia
3 Nuclear Engineering Department, Faculty of Engineering, King Abdulaziz University, Jeddah 21589, Saudi Arabia
4 King Abdullah International Medical Research Center (KAIMRC), Jeddah, Saudi Arabia
5 Princess Norah Oncology Center (PNOC), National Guard Health Affairs (NGHA), Jeddah, Saudi Arabia
6 Radiology Department, Faculty of Medicine, King Abdulaziz University, Jeddah 21859, Saudi Arabia
Received: 12 June 2015
Accepted: 17 December 2015
Landauer optically stimulated luminescence (OSL) technology nanoDot dosimeters (OSLDs) are characterized for use in mammography screening at various tube voltages, mAs values and target/filter combinations. The average glandular dose (AGD) for a 50-mm breast, based on the representative compressed breast thickness of a 45-mm polymethyl methacrylate (PMMA) phantom, is assessed using OSLDs with different beam conditions. Further, the linearity of the OSLD response is measured and angular dependence tests are performed for various tube potentials, mAs and target/filter combinations. The breast-absorbed doses are measured at various depths for a 32-kVp X-ray beam at 100 mAs, with a Mo/Rh target/filter combination. The measured incident air kerma values at different lateral positions exhibit a maximum deviation of 6%, and the average relative response of the OSLDs at the reference point (center) with respect to various lateral positions is found to be 1.001 ± 0.09%. The calculated AGD values are in the 1.3 ± 0.1−3.5 ± 0.2 mGy range, depending on the tube potential, tube loading and target/filter combinations. An exposure setup featuring the auto-exposure control (AEC) mode, 28 kVp, 73.8 mAs, and a Mo/Rh target/filter combination may be preferred for mammography screening for a compressed breast thickness of 45 mm.
Key words: Optically Stimulated Luminescence Dosimeter (OSLD) / OSL characterization / mammography / breast phantom / Average Glandular Dose (AGD) / ionization chamber / kVp / mAs / target / filter
© EDP Sciences, 2016
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