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1989 Volume 45 Issue 1 Pages
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1989 Volume 45 Issue 1 Pages
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Article type: Index
1989 Volume 45 Issue 1 Pages
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Article type: Appendix
1989 Volume 45 Issue 1 Pages
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1989 Volume 45 Issue 1 Pages
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HISASHI MAEKOSHI, MASATOSHI TSUZAKA, KINIHIDE NISHIZAWA, TADASHI TAMIY ...
Article type: Article
1989 Volume 45 Issue 1 Pages
1-8
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The temperature of a diagnostic X-ray tube target which is loaded continuously for a long time rises gradually. A tungsten target and its molybdenum rotation shaft expand with heat, so that the focal spot on the target shifts slightly in the direction parallel with the X-ray tube axis. This movement is the subject of this paper. The changed values of the focal spot position due to thermal expansion can be detected by magnification radiography of the focal spot, and confirmed by measuring variations in the total number of photons included in the X-ray spectrum curve. The distances moved between the position of a cold focal spot before loading the X-ray tube and that of a hot focal spot after loading the X-ray tube in various ways fell in most cases in the range of about 100 to 300 μm.
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SYOICHI INAGAKI, MICHIO ICHIKAWA, MAKOTO KURANISHI, MAMORU NAKAMURA, H ...
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1989 Volume 45 Issue 1 Pages
9-15
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It is very important to control developer quality to get good radiographs in automatic X-ray film processors. Most of us has been interested in the fit replenishment control of a developer in the processors. So we have newly designed developer replenishment control system which was able to change a replenisher rate for fitter one automatically according to each exposure position of radiographs and investgated the utility. We were satisfied with the results. Through our experiments, the method of this system showed that daily. Br content in the developing solution was more stable than conventional one that determined the replenisher rate with sizes of X-ray film only.
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MANABU NAKATA, HIROKI NOHARA, YUTAKA YUKAWA, TAKASHI OKADA
Article type: Article
1989 Volume 45 Issue 1 Pages
16-22
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Wedge filters and missing tissue compensators are frequently used in radiotherapy to obtain the optimum dose distribution. In general, a dose calculation with filtered has used depth dose data for open fields. TPR, TAR, PDD and field factors because these
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YOSHINARI ISAKA, KAZUFUMI KIMURA, TAKENOBU KAMADA
Article type: Article
1989 Volume 45 Issue 1 Pages
23-29
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[in Japanese]
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1989 Volume 45 Issue 1 Pages
30-36
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
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1989 Volume 45 Issue 1 Pages
37-49
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]
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1989 Volume 45 Issue 1 Pages
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1989 Volume 45 Issue 1 Pages
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]
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1989 Volume 45 Issue 1 Pages
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
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1989 Volume 45 Issue 1 Pages
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
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1989 Volume 45 Issue 1 Pages
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1989 Volume 45 Issue 1 Pages
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1989 Volume 45 Issue 1 Pages
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1989 Volume 45 Issue 1 Pages
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1989 Volume 45 Issue 1 Pages
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