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Article type: Cover
2000 Volume 56 Issue 10 Pages
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Published: October 20, 2000
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Article type: Cover
2000 Volume 56 Issue 10 Pages
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Article type: Index
2000 Volume 56 Issue 10 Pages
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Article type: Index
2000 Volume 56 Issue 10 Pages
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[in Japanese]
Article type: Article
2000 Volume 56 Issue 10 Pages
i-
Published: October 20, 2000
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Article type: Appendix
2000 Volume 56 Issue 10 Pages
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Article type: Appendix
2000 Volume 56 Issue 10 Pages
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Article type: Appendix
2000 Volume 56 Issue 10 Pages
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Article type: Appendix
2000 Volume 56 Issue 10 Pages
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Article type: Appendix
2000 Volume 56 Issue 10 Pages
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Article type: Appendix
2000 Volume 56 Issue 10 Pages
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Article type: Appendix
2000 Volume 56 Issue 10 Pages
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Article type: Appendix
2000 Volume 56 Issue 10 Pages
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Article type: Appendix
2000 Volume 56 Issue 10 Pages
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Sumio MAKINO
Article type: Article
2000 Volume 56 Issue 10 Pages
1181-1193
Published: October 20, 2000
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Yuichiro NARITA, [in Japanese], [in Japanese], [in Japanese], [in Japa ...
Article type: Article
2000 Volume 56 Issue 10 Pages
1194-1204
Published: October 20, 2000
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Tetsuro KATAFUCHI, [in Japanese], [in Japanese], [in Japanese], [in Ja ...
Article type: Article
2000 Volume 56 Issue 10 Pages
1205-1211
Published: October 20, 2000
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Masuhiko OTSUKA
Article type: Article
2000 Volume 56 Issue 10 Pages
1212-1213
Published: October 20, 2000
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[in Japanese]
Article type: Article
2000 Volume 56 Issue 10 Pages
1214-1217
Published: October 20, 2000
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Kaoru MATSUBARA
Article type: Article
2000 Volume 56 Issue 10 Pages
1218-1230
Published: October 20, 2000
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Shiori SHIMBAYASHI
Article type: Article
2000 Volume 56 Issue 10 Pages
1231-1235
Published: October 20, 2000
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Site Equipment Design Standardization Committee
Article type: Article
2000 Volume 56 Issue 10 Pages
1236-1239
Published: October 20, 2000
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Toshimine YABUTANI, Shouichi SUZUKI, Masanao KATO, Hirofumi ANNO
Article type: Article
2000 Volume 56 Issue 10 Pages
1241-1250
Published: October 20, 2000
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Currently used stereotactic irradiation techniques that employ high-energy photon beams are based either on agamma unit that uses stationary 201-cobalt beams or on isocentric linear accelerators. The techniques that rely on linear accelerators are divided into multiple non-coplanar converging arcs, precessional convergent irradiation, and others. These techniques have respective physical characteristics, for example, the precision of dose convergence and isodose distributions. We discuss the physical characteristics of the gamma unit, multiple non-coplanar converging arcs, and precessional convergent irradiation. In terms of the precision of dose convergence, the best was the gamma unit, followed by precessional convergent irradiation, with multiple non-coplanar converging arcs third. The precision of dose convergence deteriorated with diminishing field size in all techniques, and the precision of dose convergence was improved using a circular field with supplementary collimator among the techniques using linear accelerators. In addition, stereotactic irradiation techniques should be examined for disease treatment and running cost, because the techniques that have the greatest precision in dose convergence are incompatible with all-purpose usage.
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Yukimi FUKUTOMI, Kenya MURASE, Takashi FUJII, Toshiaki KAWAKAMI, Junpe ...
Article type: Article
2000 Volume 56 Issue 10 Pages
1251-1255
Published: October 20, 2000
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Between June 1995 and August 1997, we treated 23 patients with head and neck malignancies using an xray beam and then interviewed the patients to determine the degree of subjective salivary secretion and xerostomia after long-term radiation therapy. Interviews were continued for a maximum 179 weeks(mean, 76.3 weeks)after irradiation. We scored the results as the degree of subjective salivary secretion, then noted the recovery time for salivary secretion and xerostomia. When salivary glands had been irradiated to a total dose of 30 to 60 Gy, salivary secretion and oral dryness recovered within three years in 72%(13/18)and 67%(13/18)of the patients, respectively. However, these symptoms never recovered to their original levels when the total dose was more than 60 Gy. The acute and late effects of radiation therapy may induce a risk of dental caries, oral dryness, and osteoradionecrosis as well as taste impairment. Therefore, education as to dental and oral care is mandatory for patients who will be or who have been treated with radiotherapy.
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Hajime SAKAMOTO, Osamu NAKAMURA, Makoto YUGE, Yoshitomo SANO, Saburou ...
Article type: Article
2000 Volume 56 Issue 10 Pages
1256-1265
Published: October 20, 2000
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Total skin doses of patients resulting from interventional radiological procedures have the potential to exceed the threshold doses for deterministic effects such as erythema and epilation. It is desirable to measure entrance skin dose values non-invasively, easily, and at real time. If an acceptable mathematical equation could be established, the entrance skin dose could be calculated from the measured area exposure product. We established an equation to calculate the entrance skin dose from the measured area exposure product by creating calibration factors from phantom studies. In this report, entrance skin dose was calculated by using area exposure product and our established equation, and the calculated value was compared with that of the thermoluminescent dosimetric(TLD)value in a clinical setting. Although a significant correlation was found between the calculated and measured entrance doses, the deviation was about 10% in phantom studies and 20% in the clinical setting. Using our equation, calculation of ectrance skin dose is possible from area exposure product and is useful for patient dose control in the clinical setting.
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Masayuki YAMADA, Masato NAKANE, Tatsuhiko OKADA, Yoshifumi KUWAYAMA, H ...
Article type: Article
2000 Volume 56 Issue 10 Pages
1266-1268
Published: October 20, 2000
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Akio OGURA, Masaru YAMAZAKI, Takaharu HONGOH, Hiroshi INOUE, Akihiro I ...
Article type: Article
2000 Volume 56 Issue 10 Pages
1269-1275
Published: October 20, 2000
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The fast spin echo(FSE)technique of producing T_2-weighted images in greatly reduced imaging times has recently been used for routine clinical study. FSE images show contrast that is very similar in most tissues to that of conventional SE images. However, fat shows a high signal intesity that is influenced by j-coupling and the magnetization transfer effect. The purpose of this study was to assess whether the higher signal intensity of fat is different among MRI systems and to examine the effects of j-coupling and magnetization transfer on the high signal intensity of fat on FSE. The contrast in signal intensity between fat and water was measured for various echo train lengths(ETL)with and without multislicing on FSE using a contrast phantom. Measurements were obtained with four different MRI systems. In addition, the effective T_2 values of fat were calculated for the above conditions. Results indicated that contrast for fat and water was reduced with increased ETL and by using multislicing and was different among the four MRI systems. The effective T_2 values of fat were extended for increased ETL and were not dependent on multislicing. They also differed among the four MRI systems. The extent of effective T_2 values was affected by j-coupling. In this study, it was indicated that the degree of the high signal intensity of fat on FSE differed for different MRI systems. In addition, the reasons for the high signal intensity of fat on FSE were related to the effects of j-coupling and magnetization transfer.
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[in Japanese]
Article type: Article
2000 Volume 56 Issue 10 Pages
1276-
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Article type: Appendix
2000 Volume 56 Issue 10 Pages
1277-1279
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Article type: Appendix
2000 Volume 56 Issue 10 Pages
1280-1282
Published: October 20, 2000
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Article type: Appendix
2000 Volume 56 Issue 10 Pages
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Article type: Appendix
2000 Volume 56 Issue 10 Pages
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Article type: Appendix
2000 Volume 56 Issue 10 Pages
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Article type: Appendix
2000 Volume 56 Issue 10 Pages
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Article type: Cover
2000 Volume 56 Issue 10 Pages
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