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Article type: Cover
1994 Volume 50 Issue 6 Pages
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1994 Volume 50 Issue 6 Pages
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Article type: Index
1994 Volume 50 Issue 6 Pages
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Article type: Appendix
1994 Volume 50 Issue 6 Pages
i-iv
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1994 Volume 50 Issue 6 Pages
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Article type: Appendix
1994 Volume 50 Issue 6 Pages
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KENICHI YOSHIDA, AKIYOSHI OHTSUKA, SYUICHI YAMAUCHI, KATSUHIKO UEDA, S ...
Article type: Article
1994 Volume 50 Issue 6 Pages
710-715
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We studied a reduction in patient dose using niobium, yttrium and molybdenum filters with K-absorption edge in low X-ray energy. Patient dose, effective X-ray energy, relative X-ray intensity and subject contrast were measured in the case of with and without filters. As results, patient dose can be decreased by 20〜40% with filters in comparison to without filters at 50〜80kV tube voltage. However, this is the same case with an aluminum filter as well. Effective X-ray energy was increased in 2〜7keV by filtration at 40〜80kV tube voltage and also relative X-ray intensity was decreased by 40〜70% at 50〜80kV tube voltage. Radiographic contrast dropped a little compared to that of without filter. However there was no problem in the reading of the radiograph. Results show niobium, yttrium and molybdenum filters are not completely superior to aluminum filter.
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MITSUGI HONDA, AKIRA YOSHIDA, NOBUE NAKAMURA, TOSHIMI KOBASHI, TADASHI ...
Article type: Article
1994 Volume 50 Issue 6 Pages
716-721
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By combining the new SR film series for fast processing of Konica film with green light-emitting intensifying screens KO-250, the image quality characteristics could be determined. The image quality characteristics such as sensitivity, contrast, resolution and granularity were measured. And then, NEQ (u) could be calculated from the data. The sensitivity and contrast were determined by measuring the characteristic curves, the resolution and the granularity by measuring the MTF and Wiener spectra, respectively. As for the sensitivity and contrast, the contrast was lower, and sensitivity was higher in SR-V than in SR-H. As for SR-C, the contrast in the low density part was lowered, and that in high density part was restrained. As compared with SR-G, the MTF was high in SR-V, low in SR-L and SR-C, and the same for SR-H. The Wiener spectra were low in SR-C, high in SR-H and SR-V, and the same for SR-L as compared with SR-G. SR-C showed a higher value of NEQ (u) in the region of low frequency below 1.0 cycle/mm.
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KOUZOU HANAI, KANYUU IHARA, TOMOYUKI FUJITA, FUMIKO IHARA, TSUTOMU MUR ...
Article type: Article
1994 Volume 50 Issue 6 Pages
722-732
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1994 Volume 50 Issue 6 Pages
733-747
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1994 Volume 50 Issue 6 Pages
748-758
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1994 Volume 50 Issue 6 Pages
759-762
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1994 Volume 50 Issue 6 Pages
763-766
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1994 Volume 50 Issue 6 Pages
767-770
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1994 Volume 50 Issue 6 Pages
771-777
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1994 Volume 50 Issue 6 Pages
778-791
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1994 Volume 50 Issue 6 Pages
792-
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1994 Volume 50 Issue 6 Pages
792-
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Article type: Article
1994 Volume 50 Issue 6 Pages
792-
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1994 Volume 50 Issue 6 Pages
792-
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Article type: Article
1994 Volume 50 Issue 6 Pages
792-
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Article type: Article
1994 Volume 50 Issue 6 Pages
792-
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Article type: Article
1994 Volume 50 Issue 6 Pages
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Article type: Article
1994 Volume 50 Issue 6 Pages
792-793
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1994 Volume 50 Issue 6 Pages
793-
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Article type: Article
1994 Volume 50 Issue 6 Pages
793-
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Article type: Article
1994 Volume 50 Issue 6 Pages
793-
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1994 Volume 50 Issue 6 Pages
793-
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Article type: Article
1994 Volume 50 Issue 6 Pages
793-
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1994 Volume 50 Issue 6 Pages
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1994 Volume 50 Issue 6 Pages
793-
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1994 Volume 50 Issue 6 Pages
793-794
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1994 Volume 50 Issue 6 Pages
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1994 Volume 50 Issue 6 Pages
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1994 Volume 50 Issue 6 Pages
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1994 Volume 50 Issue 6 Pages
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1994 Volume 50 Issue 6 Pages
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1994 Volume 50 Issue 6 Pages
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1994 Volume 50 Issue 6 Pages
794-795
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1994 Volume 50 Issue 6 Pages
795-
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1994 Volume 50 Issue 6 Pages
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1994 Volume 50 Issue 6 Pages
795-
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1994 Volume 50 Issue 6 Pages
795-
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1994 Volume 50 Issue 6 Pages
795-
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1994 Volume 50 Issue 6 Pages
795-796
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1994 Volume 50 Issue 6 Pages
796-
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1994 Volume 50 Issue 6 Pages
796-
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1994 Volume 50 Issue 6 Pages
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1994 Volume 50 Issue 6 Pages
796-
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1994 Volume 50 Issue 6 Pages
796-
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