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Article type: Cover
1994 Volume 50 Issue 5 Pages
Cover15-
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Article type: Appendix
1994 Volume 50 Issue 5 Pages
App9-
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Article type: Appendix
1994 Volume 50 Issue 5 Pages
App10-
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Article type: Index
1994 Volume 50 Issue 5 Pages
Toc15-
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Article type: Index
1994 Volume 50 Issue 5 Pages
Toc16-
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Article type: Appendix
1994 Volume 50 Issue 5 Pages
i-iv
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Article type: Appendix
1994 Volume 50 Issue 5 Pages
v-xi
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MIKIO OISHI, TSUYOSHI KATAKURA, SHOGO SUZUKI
Article type: Article
1994 Volume 50 Issue 5 Pages
614-621
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A digital radiography system using a cooled CCD (C-CCD) camera was developed to get still pictures using an X-ray TV. Its optical unit consists of a screen and a C-CCD camera for the purpose of reducing image distortion and repressing shot noises originating in the CCD chip. The system performance, including noise as a function of temperature, stability, linearity, sensitivity, and resolution, has been carefully examined. At -30(℃), the noise of the C-CCD camera is about 1/200 as small as those at +25(℃), resulting in very sharp X-ray images, with less than 1% repetitive precision. Also, the output characteristics have excellent linearity in a wide range of relative X-ray exposures. The resolution measured for the field size of 22×22cm is approximately equal to that of a 100mm size mirror camera, though the sensitivity needs further improvement. One possible way to improve sensitivity and resolution might be the use of a highly sensitive CCD camera.
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NOBUHIRO ODA, KENJI KISHIMOTO, SEIICHI MURAKAMI, KUNIHIRO TERADA, HIDE ...
Article type: Article
1994 Volume 50 Issue 5 Pages
622-629
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Materials and thicknesses of additional filter and X-ray tube voltage for abdominal computed radiography were investigated. Skin exposure were reduced to 35% using a 0.12mm copper filter or a 0.12mm gadolinium filter compared with no filtration under the same radiographic contrast and noise. Improvement of the image quality of patient exposures were achieved using these filtering materials.
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KIYOTAKA KATO, KAZUHISA SATO, KATSUMI NAKAMURA, KIYOSHI OGIHARA, KATSU ...
Article type: Article
1994 Volume 50 Issue 5 Pages
630-636
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In August, 1978, Linac (LMR-15, Z4 Toshiba) was installed at our hospital and in use for 12 years up to September 1990. Recently, we completed working and failure records on this apparatus during the 12-year period, for the purpose of their analysis in the basis of reliability engineering. The results revealed operation rate of 97.85% on the average, mean time between failures (MTBF) from 40〜70 hours about the beginning of its working to 280 hours for 2 years before renewal and practically satis factory values of mean life of parts of life such as magnetron, thyratron and electron gun; the above respective values proved to be above those reported by other literature. On the other hand, we classified, by occurring system, the contents of failures in the apparatus and determined the number of failures and the temperature and humidities in care of failures to examine the correlation between the working environment and the failure. The results indicated a change in humidity to gain control of failures in the dosimetric system, especially the monitoring chamber and we could back up the strength of the above correlation from a coefficient of correlation value of 0.84.
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[in Japanese]
Article type: Article
1994 Volume 50 Issue 5 Pages
637-651
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[in Japanese]
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1994 Volume 50 Issue 5 Pages
652-658
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[in Japanese]
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1994 Volume 50 Issue 5 Pages
659-665
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1994 Volume 50 Issue 5 Pages
666-682
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Article type: Appendix
1994 Volume 50 Issue 5 Pages
683-
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1994 Volume 50 Issue 5 Pages
683-
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Article type: Appendix
1994 Volume 50 Issue 5 Pages
683-
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Article type: Appendix
1994 Volume 50 Issue 5 Pages
683-
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1994 Volume 50 Issue 5 Pages
683-
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1994 Volume 50 Issue 5 Pages
683-
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1994 Volume 50 Issue 5 Pages
683-
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1994 Volume 50 Issue 5 Pages
683-
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Article type: Article
1994 Volume 50 Issue 5 Pages
683-
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[in Japanese]
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1994 Volume 50 Issue 5 Pages
683-684
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Article type: Article
1994 Volume 50 Issue 5 Pages
684-
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Article type: Article
1994 Volume 50 Issue 5 Pages
684-
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]
Article type: Article
1994 Volume 50 Issue 5 Pages
684-
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1994 Volume 50 Issue 5 Pages
684-
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]
Article type: Article
1994 Volume 50 Issue 5 Pages
684-
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[in Japanese]
Article type: Article
1994 Volume 50 Issue 5 Pages
684-685
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Article type: Article
1994 Volume 50 Issue 5 Pages
685-
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]
Article type: Article
1994 Volume 50 Issue 5 Pages
685-
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Article type: Article
1994 Volume 50 Issue 5 Pages
685-
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Article type: Article
1994 Volume 50 Issue 5 Pages
685-
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Article type: Article
1994 Volume 50 Issue 5 Pages
685-
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Article type: Article
1994 Volume 50 Issue 5 Pages
685-
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Article type: Article
1994 Volume 50 Issue 5 Pages
685-
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Article type: Article
1994 Volume 50 Issue 5 Pages
685-686
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]
Article type: Article
1994 Volume 50 Issue 5 Pages
686-
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Article type: Article
1994 Volume 50 Issue 5 Pages
686-
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Article type: Article
1994 Volume 50 Issue 5 Pages
686-
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]
Article type: Article
1994 Volume 50 Issue 5 Pages
686-
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[in Japanese], [in Japanese], [in Japanese]
Article type: Article
1994 Volume 50 Issue 5 Pages
686-
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Article type: Article
1994 Volume 50 Issue 5 Pages
686-
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[in Japanese]
Article type: Article
1994 Volume 50 Issue 5 Pages
686-
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Article type: Article
1994 Volume 50 Issue 5 Pages
686-
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Article type: Article
1994 Volume 50 Issue 5 Pages
686-687
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Article type: Article
1994 Volume 50 Issue 5 Pages
687-
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Article type: Article
1994 Volume 50 Issue 5 Pages
687-
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Article type: Article
1994 Volume 50 Issue 5 Pages
687-
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