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Article type: Cover
1989 Volume 45 Issue 4 Pages
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Article type: Index
1989 Volume 45 Issue 4 Pages
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Article type: Index
1989 Volume 45 Issue 4 Pages
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Article type: Appendix
1989 Volume 45 Issue 4 Pages
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Article type: Appendix
1989 Volume 45 Issue 4 Pages
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Article type: Appendix
1989 Volume 45 Issue 4 Pages
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Article type: Appendix
1989 Volume 45 Issue 4 Pages
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Article type: Appendix
1989 Volume 45 Issue 4 Pages
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Article type: Appendix
1989 Volume 45 Issue 4 Pages
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Article type: Appendix
1989 Volume 45 Issue 4 Pages
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Article type: Appendix
1989 Volume 45 Issue 4 Pages
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SHIRO HOSOYA, KENJI TORIKAI
Article type: Article
1989 Volume 45 Issue 4 Pages
518-523
Published: April 01, 1989
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We measured the transmission of primary radiation, scattered radiation and total radiation of single grids(6:1〜16:1) and cross grids(4:1+4:1〜10:1+10:1) by a fluorescene meter, when the phantom is a 20cm thick water, and tube voltage is 100 kV. Then,phsical characterristics(selectivity, contrast inprovement ratio, grid exposure factor) are calculated by these transmission. For user of grid, contrast inprove ment ratio and grid exposure factor are especially important, and the result indicate that single grids can provide higher contrast improvement ratio than cross grids, without an increase in grid exposure factor.
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AHIROTAKA IKEDA, KOHICHI TASHIRO, KAZUAKI AKASHI, KATASHI OHBA, MASAYO ...
Article type: Article
1989 Volume 45 Issue 4 Pages
524-529
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TAKENORI HACHIYA, YASUKAI SHOJI, EIICHI HAGAMI, YASUKO AIZAWA, HIROSHI ...
Article type: Article
1989 Volume 45 Issue 4 Pages
530-536
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TETSUZO NARA
Article type: Article
1989 Volume 45 Issue 4 Pages
537-542
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We tired a method for designing compensators using isodose distributions made with a Modulex radiation therapy planning computer. This metod enabled us to design filters compensation both for irregularity of the beam entrance surface and inhomogeneities within the body. The compensator's design was carried out only on a plane including the beam axis for 10 MV X-ray beams. It was found from the experimental results that the accuracy of isodose distributions with compensators made for a phantom only with an obique incident surface and for a phantom both with an oblique incident surce and with a cork inhomogeneity is about +-5%within the field.
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[in Japanese]
Article type: Article
1989 Volume 45 Issue 4 Pages
543-547
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1989 Volume 45 Issue 4 Pages
548-
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1989 Volume 45 Issue 4 Pages
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]
Article type: Article
1989 Volume 45 Issue 4 Pages
548-549
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1989 Volume 45 Issue 4 Pages
549-
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]
Article type: Article
1989 Volume 45 Issue 4 Pages
549-550
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1989 Volume 45 Issue 4 Pages
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[in Japanese], [in Japanese], [in Japanese]
Article type: Article
1989 Volume 45 Issue 4 Pages
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[in Japanese], [in Japanese], [in Japanese]
Article type: Article
1989 Volume 45 Issue 4 Pages
550-551
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]
Article type: Article
1989 Volume 45 Issue 4 Pages
551-
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]
Article type: Article
1989 Volume 45 Issue 4 Pages
551-552
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[in Japanese], [in Japanese], [in Japanese]
Article type: Article
1989 Volume 45 Issue 4 Pages
552-
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]
Article type: Article
1989 Volume 45 Issue 4 Pages
552-553
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1989 Volume 45 Issue 4 Pages
553-
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1989 Volume 45 Issue 4 Pages
553-554
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1989 Volume 45 Issue 4 Pages
554-
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1989 Volume 45 Issue 4 Pages
554-
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]
Article type: Article
1989 Volume 45 Issue 4 Pages
554-555
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[in Japanese], [in Japanese]
Article type: Article
1989 Volume 45 Issue 4 Pages
555-
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1989 Volume 45 Issue 4 Pages
555-556
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[in Japanese], [in Japanese], [in Japanese]
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1989 Volume 45 Issue 4 Pages
556-
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Article type: Article
1989 Volume 45 Issue 4 Pages
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[in Japanese]
Article type: Article
1989 Volume 45 Issue 4 Pages
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[in Japanese], [in Japanese]
Article type: Article
1989 Volume 45 Issue 4 Pages
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1989 Volume 45 Issue 4 Pages
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1989 Volume 45 Issue 4 Pages
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1989 Volume 45 Issue 4 Pages
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1989 Volume 45 Issue 4 Pages
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1989 Volume 45 Issue 4 Pages
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Article type: Article
1989 Volume 45 Issue 4 Pages
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Article type: Article
1989 Volume 45 Issue 4 Pages
560-
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1989 Volume 45 Issue 4 Pages
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Article type: Article
1989 Volume 45 Issue 4 Pages
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1989 Volume 45 Issue 4 Pages
561-562
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1989 Volume 45 Issue 4 Pages
562-
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