EVALUATION OF ABSORBED DOSE OF THE MAMMARY GLAND WITH A MINUTE ORGANIC DETECTOR

概要

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Risk of mammography should be evaluated by the totally absorbed dose into the mammary gland, which is the point of origination of mammary carcinoma. Using a minute anthracene detector immersed in an alcohol/ water mixture, the gland dose was obtained and represented against beam quality (first half-value layer in aluminum) so that it can be presumed from in-air exposure required per view. This study reveals that even if the beam quality of the entrance x-rays is equal for the molybdenum and tungstenum anode x-ray tubes, this does not hold true at each depth of the breasts. The gland dose is around 1/5, for film mammography of the in-air exposure, and is less dependent on age and beam quality compared to skin dose. These results support the use of mammography even for periodic mammary surveys, and also imply that high-sensitivity imaging systems are called for rather than attempting to reduce patient dose by relying on harder beam technique.
公益社団法人日本放射線技術学会の論文
1988-11-01