CR画像を用いた乳腺含有率および乳腺組織吸収線量の推定

概要

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Currently, the exposure dose in mammography is routinely evaluated according to the American College of Radiology (ACR) guidelines. However, it is difficult in clinical practice to calculate accurately the average glandular dose of patients because of unknown breast composition. By using mammographic CR images of 4, 200, 000 pixels as clinical images and the "measuring device for each pixel, "we were able to ascertain the relationship between breast composition and the dose lost as a result of phantom thickness, and could calculate average breast composition in clinical images, something which we were unable to do previously. Finally, we determined the average glandular dose using the R-mGy conversion coefficient (D_<gN>) that we obtained from individual breast compositions that were based on the clinical images. Because breast composition is fixed at 50% in the ACR precision management manual, there was a 0.83 mGy maximum and-0.16 mGy average difference in average glandular dose between the ACR manual and our method.
社団法人日本放射線技術学会の論文
2000-07-20