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Evaluation of the Accuracy of the Displayed Average Glandular Dose in Mammography
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- Kitano Masako
- Division of Radiology, Department of Medical Technology, Kochi Medical School Hospital Division of Health Science, Graduate School of Health Science, Suzuka University of Medical Science
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- Tokorodani Ryotaro
- Division of Radiology, Department of Medical Technology, Kochi Medical School Hospital
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- Yamada Yoko
- Division of Radiology, Department of Medical Technology, Kochi Medical School Hospital
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- Muto Hiroe
- Division of Health Science, Graduate School of Health Science, Suzuka University of Medical Science
Bibliographic Information
- Other Title
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- マンモグラフィにおける平均乳腺線量の表示値の精度に関する評価
- マンモグラフィ ニ オケル ヘイキン ニュウセンセンリョウ ノ ヒョウジチ ノ セイド ニ カンスル ヒョウカ
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Description
<p>Purpose: We aimed to clarify the error of displayed value against the measured value of the average glandular dose (AGD) in two-dimensional (2D) mammography and digital breast tomosynthesis (DBT) and evaluate the accuracy of the displayed AGD as an index to estimate AGD. Methods: Polymethyl methacrylate (PMMA) phantoms with thicknesses varying from 20 to 80 mm were imaged, and the values displayed on the mammography system were used as the displayed AGD. The incident air kerma and the half-valued layer were measured, and the measured AGD in 2D mammography was calculated using the equation by Dance et al. On the other hand, the measured AGD in DBT was calculated by correcting for different projection angles. The relative error to the PMMA thickness was evaluated by assessing the relative error of the displayed AGD against the measured AGD. Results: The maximum relative error of the displayed AGD against the measured AGD was 17.3% in 2D mammography, 19.1% in the standard (ST) mode, and 19.8% in the high-resolution (HR) mode. Conclusion: The relative error of the displayed AGD against the measured AGD tended to increase with increase in PMMA thickness. This tendency was especially noticeable for PMMA with thicknesses of 70 and 80 mm in DBT.</p>
Journal
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- Japanese Journal of Radiological Technology
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Japanese Journal of Radiological Technology 78 (11), 1333-1340, 2022
Japanese Society of Radiological Technology