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Article type: Cover
1992 Volume 48 Issue 9 Pages
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Article type: Index
1992 Volume 48 Issue 9 Pages
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Article type: Index
1992 Volume 48 Issue 9 Pages
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Article type: Appendix
1992 Volume 48 Issue 9 Pages
i-xxiii
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Article type: Appendix
1992 Volume 48 Issue 9 Pages
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1992 Volume 48 Issue 9 Pages
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SEIICHI MIMURA, YASUTAKA MIKAMI, KEIJI INAMURA, SEIJI TAHARA, HIROFUMI ...
Article type: Article
1992 Volume 48 Issue 9 Pages
1684-1691
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We have often encountered patients with segmental instrumentation when employing external beam therapy of bone metastasis, and felt it important to investigate the effect of stainless steel in relation to does distribution. The stainless steel in a 10MV X-ray beam increases the radiation level on the side of the steel towards the radiation source by backscattered radiation and sideways by scattering radiation from the metal. These results showed these overdosages occurred within 10mm from the stainless steel. In the transition zone, however, the dose was much lower in response to the thickness of the stainless steel than in the acrylic phantom. Especially, the absorbed does of the just behind stainless steel abruptly dropped due to absorption of the secondary electrons and these underdosages which were below the steel were limited in the vicinity of its interface. The front and behind sides interface effect in treatment with the opposed beams using one field were reduced.
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YOSHIYUKI ISHIMORI, KATSUYA SUGIMOTO, HIROYUKI KOMURO
Article type: Article
1992 Volume 48 Issue 9 Pages
1692-1697
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We developed a new method to measure bone mineral using Quantitative Computed Tomography (QCT) employing a conventional 2-scan dual energy method, using a subtraction image scanned by 120kV and 80kV. The ROI is automatically set by selecting the threshold. Then, calculate the calcium content based on the reference phantom's CT value scanned at the same time. The advantage of using this method was proven when compared with Single Energy QCT in a basic evaluation by using phantoms. Tendency, the element that has low atomic number cause a result lower, and beam hardening effect decreases. Also, the accuracy of the ROI area and measured value improves. This method may be good for the parts that have complicated shapes and constructions.
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MASAMI KATSURAGAWA, TAKANOBU IWASAKI, HIROO SEGAWA, SETSUO NAKASE
Article type: Article
1992 Volume 48 Issue 9 Pages
1698-1703
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In order to evaluate the accuracy of the regional cerebral blood flow (r-CBF) measured by CT 9800 Xenon CBF Imaging System which was provided by G.E, a theoretical quantitative analysis of r-CBF and CT 9800 Xenon CBF Imaging System were preformed in 20 cases, and these obtained values were compared with each method. The theoretical quantitative analysis of r-CBF was done as follows; Time activity curves of xenon gas concentration were generated from region of interest (ROI) over the gray matter and white matter. An exponential function was fitted to the time activity curves to determine build up rate (K_a) and blood-brain partition coefficent (λ_a). K_a and λ_a were 0.83±0.53 (mean±SD), 0.86±0.28 in the gray matter, and 0.39±0.29, 0.79±0.53 in the white matter respectively. A correlation coefficient of 0.53, a slope of 0.79, and a zero intercept of 10.69 were obtained to compared with both methods. It is important for clinical estimations of r-CBF to understand the fundamental parameter which build in the CT.
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Article type: Appendix
1992 Volume 48 Issue 9 Pages
1704-1706
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Article type: Appendix
1992 Volume 48 Issue 9 Pages
1707-1720
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1992 Volume 48 Issue 9 Pages
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1992 Volume 48 Issue 9 Pages
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1992 Volume 48 Issue 9 Pages
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1992 Volume 48 Issue 9 Pages
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1992 Volume 48 Issue 9 Pages
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1992 Volume 48 Issue 9 Pages
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1992 Volume 48 Issue 9 Pages
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1992 Volume 48 Issue 9 Pages
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1992 Volume 48 Issue 9 Pages
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1992 Volume 48 Issue 9 Pages
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1992 Volume 48 Issue 9 Pages
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1992 Volume 48 Issue 9 Pages
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1992 Volume 48 Issue 9 Pages
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1992 Volume 48 Issue 9 Pages
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1992 Volume 48 Issue 9 Pages
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1992 Volume 48 Issue 9 Pages
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1992 Volume 48 Issue 9 Pages
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1992 Volume 48 Issue 9 Pages
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1992 Volume 48 Issue 9 Pages
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1992 Volume 48 Issue 9 Pages
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1992 Volume 48 Issue 9 Pages
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1992 Volume 48 Issue 9 Pages
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1992 Volume 48 Issue 9 Pages
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1992 Volume 48 Issue 9 Pages
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1992 Volume 48 Issue 9 Pages
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1992 Volume 48 Issue 9 Pages
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1992 Volume 48 Issue 9 Pages
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1992 Volume 48 Issue 9 Pages
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1992 Volume 48 Issue 9 Pages
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1992 Volume 48 Issue 9 Pages
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1992 Volume 48 Issue 9 Pages
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1992 Volume 48 Issue 9 Pages
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1992 Volume 48 Issue 9 Pages
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1992 Volume 48 Issue 9 Pages
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1992 Volume 48 Issue 9 Pages
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1992 Volume 48 Issue 9 Pages
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1992 Volume 48 Issue 9 Pages
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1992 Volume 48 Issue 9 Pages
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1992 Volume 48 Issue 9 Pages
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