Nationwide Survey of Glandular Tissue Dose for Establishment of Breast Cancer Screening Using Mammography.
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概要
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A nationwide survey was performed in an attempt to investigate the distribution of average glandular doses caused by mammography for breast cancer mass screening, and to utilize the data to determine the national guidance level for mammography. A phantom equivalent to a breast with a compressed thickness of 42mm, and glass radio-photo luminescence dosimeters were sent to 104 institutions and facilities. The dosimeters were exposed using a method based on the protocols described in the Mammography Quality Control Manual. The returned dosimeters were then analyzed, and the beam qualities and the entrance surface exposures were determined. Using these values, the average glandular doses were estimated with an accuracy of ±8%. The doses ranged from 0.5 to 3.7mGy. The mean dose and the standard deviation were 1.48mGy and 0.52mGy, respectively. In 91 facilities, the doses were less than 2mGy. Regarding the technical factors for facilities which presented doses of 2mGy or over, it seemed that the doses could be easily reduced to less than 2mGy if the settings of the auto exposure controller (AEC), anti-scatter grid and/or the film-screen system were optimized.
- 日本乳癌検診学会の論文
日本乳癌検診学会 | 論文
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