乳房撮影系における写真特性と透過X線スペクトルについて

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The combination of molybdenium anode X-ray tube (with a beryllium window and 0.03mm molybdenium filter) and a single high resolution intensifying screen (rare earth phosphors) with a green-sensitive single emulsion film is regarded as a very useful and optimum system for mammography. In order to find the optimum exposure condition in this system that we investigated the transmission properties of the mammographic cassette, the intensifying screen and the specimen of breast. We examined four cassettes by the contrast (0.1/0.5mm aluminium), the visibility of small particles (Mg_2 SiO_4,150〜600μm diameter) by five observers and dose measurements using mammographic phantom, Kodak Min-R screen and Fuji RX-M film. We measured the transmission photon spectra by using pure germanium detector through tumor and normal glandular tissue of breast cancer (3.5kg weight, 6.5cm, thickness and 1.0cm tumor diameter) after surgery. We examined the relationship between the contrast and the transmission photon spectra of macro-specimen of breast cancer (fixation in 10% folmalin solution). Then we selected the phantom materials for mammography which have the same property as the specimen of cancer in the transmission spectra. From these results, the low tube voltage (25kV)technique gives high contrast and good visiblity of small particles in this system. Also in the system, the smaller X-ray absorption of cassette (or package) gives higher contrast, better visiblity and lower dose. For the phantom materials, ABS resin has almost same transmission property as the measured normal glandular tissue and Lucite is almost same as the measured tumor and glandular from the point of transmission spectra.
社団法人日本放射線技術学会の論文
1980-01-01

乳房撮影系における写真特性と透過X線スペクトルについて

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