Characterization of optically stimulated luminescence for assessment of breast doses in mammography screening
Autor: | A. A. Kinsara, F. Nadwi, H. Natto, Mawya A. Khafaji, D. Alothmany, A. Saoudi, Ahmad A. Jiman, Nurul Islam Molla, Nazeeh Alothmany, Mohammed Sami Tayeb, Muhammad Yusuf, Noor Mail |
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Rok vydání: | 2016 |
Předmět: |
Materials science
Optically stimulated luminescence Health Toxicology and Mutagenesis 01 natural sciences Imaging phantom 030218 nuclear medicine & medical imaging 03 medical and health sciences Kerma 0302 clinical medicine 0103 physical sciences medicine Mammography Safety Risk Reliability and Quality Waste Management and Disposal Dosimeter medicine.diagnostic_test 010308 nuclear & particles physics Renewable Energy Sustainability and the Environment business.industry Public Health Environmental and Occupational Health Nuclear Energy and Engineering Ionization chamber Nanodot Nuclear medicine business Beam (structure) Biomedical engineering |
Zdroj: | Radioprotection. 51:51-58 |
ISSN: | 1769-700X 0033-8451 |
Popis: | 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. |
Databáze: | OpenAIRE |
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