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Volume 45, Issue 12
Displaying 1-34 of 34 articles from this issue
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Article type: Cover
1989 Volume 45 Issue 12 Pages Cover6-
Published: December 01, 1989
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Article type: Index
1989 Volume 45 Issue 12 Pages Toc7-
Published: December 01, 1989
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Article type: Index
1989 Volume 45 Issue 12 Pages Toc8-
Published: December 01, 1989
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Article type: Appendix
1989 Volume 45 Issue 12 Pages i-ii
Published: December 01, 1989
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Article type: Appendix
1989 Volume 45 Issue 12 Pages iii-
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Article type: Appendix
1989 Volume 45 Issue 12 Pages iv-
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Article type: Appendix
1989 Volume 45 Issue 12 Pages v-
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Article type: Appendix
1989 Volume 45 Issue 12 Pages vi-
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Article type: Appendix
1989 Volume 45 Issue 12 Pages vii-
Published: December 01, 1989
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Article type: Appendix
1989 Volume 45 Issue 12 Pages viii-x
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Article type: Appendix
1989 Volume 45 Issue 12 Pages App5-
Published: December 01, 1989
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TETSUZO NARAArticle type: Article
1989 Volume 45 Issue 12 Pages 1812-1818
Published: December 01, 1989
Released on J-STAGE: June 28, 2017
JOURNAL FREE ACCESSTissue-maximum ratios (TMR) in a thorax phantom were measured using two types of chambers for 10 MV X-ray fields at a source-chamber distance (SCD) of 100 cm. One was a Farmer-2581 chamber with a cavity volume of 0.6 cm^3 and wall thickness of 0.04 g/cm^2, and the other was a Capintec-PR-05P with a cavity volume of 0.07cm^3 and wall thickness of 0.22 g/cm^2. It has been found that in the back soft-tissue layer for fields of 5×5 to 15×15 cm^2, the ralative deviation of the TMR value by the 0.6-cm^3 chamber from the one by the 0.07-cm^3 chamber ranges from -0.9% not necessary to +0.5%. No significant difference existed between the two chambers in TMRs within the soft-tissue (Mix-Dp) layers. However, the following results has been obtained in the lung (cork with a density of 0.23g/cm^3) layer: (1) When a wall correction is performed for both chambers, the ralative deviation of the TMR value by the 0.6-cm^3 chamber from the one by the 0.07-cm^3 chamber is about -3% for a field of 5×5 cm^2. (2) The 0.6-cm^3 chamber makes small readings for fields of 6×6 cm^2 and less die to lack of uniformity in the dose distribution yieded in the 0.6-cm^3 chamber cavity. (3) A wall correction is needed for the 0.07-cm^3 chamber for fields of 7×7 cm^2 and less because the chamber wall is relatively thick.View full abstractDownload PDF (611K) -
EIJI ANDOH, FUMIARO YUBA, FUMIAKI UTO, SHIGEKI UYAMA, YUKITOSHI KOTOHArticle type: Article
1989 Volume 45 Issue 12 Pages 1819-1824
Published: December 01, 1989
Released on J-STAGE: June 28, 2017
JOURNAL FREE ACCESSRecently, computerized units are generally used causing wide-ranging changes in our work posture. We analyzed work posture for X-CT, X-TV and R.I. making inquiries about the chairs used by the radiation units in 48 hospitals throughout Nara Prefecture with the following results being obtained. The sitting posture was most widely used because of Visual Display Terminal. Types, hight and purchasing method of the chairs differed greatly from hospital to hospital. These result indicate that both the maker and user were not to interested in the chairs regarding operation, work posture and environment. We thick that chairs should be examined from the view point of human engineering by both the maker and user.View full abstractDownload PDF (546K) -
TOSHIZO KATSUDA, TADASHI NAKAJIMA, TADAO KUWANO, AKIRA KURIMURA, JIRO ...Article type: Article
1989 Volume 45 Issue 12 Pages 1825-1831
Published: December 01, 1989
Released on J-STAGE: June 28, 2017
JOURNAL FREE ACCESSIt is important to demonstrate clearly the hepatic arteries, parasitic arteries and small stains in conventional hepatic angiography and lipiodol accumulations after transcatheter arterial embolization with lipiodol. A diaphragmatic compensating filter (DCF) covering the diaphragmatic region was made originally. The shape of DCF for a high density part of the angiogram is similar to the shape of diaphragm, but the shape for a low density part could not be specified. The smallest tolerance of the DCF was 13.2 mm on the film. Therefore, a DCF was effective in more than 95.8% of angiograms. Only one type of DCF is possible to use in combination with side compensating filters. The clinical value of the radiographic images were remarkable improved, more than 29%, by the image analyze system, PIAS LA-500. Therefore, a DCF is indispensable in conventional hepatic angiography.View full abstractDownload PDF (946K) -
HIROFUMI HIGASHIMARU, SADAYOSHI MORI, RYUHKI SATOH, YOSHIROH NAKAMURA, ...Article type: Article
1989 Volume 45 Issue 12 Pages 1832-1837
Published: December 01, 1989
Released on J-STAGE: June 28, 2017
JOURNAL FREE ACCESSFro the viewpoint that the effective focal spot size of a X-ray tube is a major factor affecting the image quality of X-ray pictures, we have inspected periodically the effective focal spot size using star chart. We concluded from our measuring results that no significant change exests in size by operating year. Despite our conclusion, ORITO reported in 1987 that a tendency of an increase existed in size by operating year. Our redetermination found that the change in size was within 10% at maximum and no relevance prevailed between the effective focal spot change and exposure counts not operating year because we admitted there are ±2%~±5% error in chart reading and also ±1%~±5% error in chart arranging, so we recognized these changes in value are within the measuring error. In consequence, the data above suggest that it has no significant meaning in effective focal spot size measurement.View full abstractDownload PDF (605K) -
JUNJI SHIRAISHI, MASAKATSU HATAGAWAArticle type: Article
1989 Volume 45 Issue 12 Pages 1838-1843
Published: December 01, 1989
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JOURNAL FREE ACCESSIn order to take radiographic photos, it is necessary to know a great dial of information. For example, mA, kV, exposuretime, screen, grid, phototimer, etc. In this study, we examined 4 widely-used types computer-programmed X-ray equipment. These computer-assisted processes are designed to look at the data and make programmed individual decisions. The propose is to reduce the differences in radiographic quality and the risk of retaking caused by the differences in experience among technicians. We concluded that none of them has ideal functions but each can be used as a source supply information, if a little remodeling is done, and we confirm that computer-programmed X-ray equipment is, and will continue to go be, necessary.View full abstractDownload PDF (565K) -
YUKIMI FUKUTOMI, MASAHIRO YOSHIMOTO, TOSHIAKI KAWAKAMIArticle type: Article
1989 Volume 45 Issue 12 Pages 1844-1849
Published: December 01, 1989
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[in Japanese]Article type: Article
1989 Volume 45 Issue 12 Pages 1850-1852
Published: December 01, 1989
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[in Japanese]Article type: Article
1989 Volume 45 Issue 12 Pages 1852-1854
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[in Japanese]Article type: Article
1989 Volume 45 Issue 12 Pages 1854-1856
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[in Japanese]Article type: Article
1989 Volume 45 Issue 12 Pages 1856-1858
Published: December 01, 1989
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...Article type: Article
1989 Volume 45 Issue 12 Pages 1859-1861
Published: December 01, 1989
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...Article type: Article
1989 Volume 45 Issue 12 Pages 1861-1863
Published: December 01, 1989
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Article type: Appendix
1989 Volume 45 Issue 12 Pages 1864-1866
Published: December 01, 1989
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Article type: Appendix
1989 Volume 45 Issue 12 Pages 1867-1875
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Article type: Appendix
1989 Volume 45 Issue 12 Pages 1876-1877
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Article type: Appendix
1989 Volume 45 Issue 12 Pages 1878-
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Article type: Appendix
1989 Volume 45 Issue 12 Pages 1879-1880
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Article type: Appendix
1989 Volume 45 Issue 12 Pages 1881-1898
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Article type: Index
1989 Volume 45 Issue 12 Pages 1899-1902
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Article type: Index
1989 Volume 45 Issue 12 Pages 1903-1905
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Article type: Appendix
1989 Volume 45 Issue 12 Pages 1906-1908
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Article type: Appendix
1989 Volume 45 Issue 12 Pages App6-
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Article type: Cover
1989 Volume 45 Issue 12 Pages Cover7-
Published: December 01, 1989
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