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Article type: Cover
1997 Volume 53 Issue 8 Pages
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Article type: Cover
1997 Volume 53 Issue 8 Pages
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Article type: Index
1997 Volume 53 Issue 8 Pages
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Article type: Index
1997 Volume 53 Issue 8 Pages
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[in Japanese]
Article type: Article
1997 Volume 53 Issue 8 Pages
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Article type: Appendix
1997 Volume 53 Issue 8 Pages
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1997 Volume 53 Issue 8 Pages
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1997 Volume 53 Issue 8 Pages
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Article type: Appendix
1997 Volume 53 Issue 8 Pages
V-VI
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TOSIAKI MIYATI, TATSUO BANNO, MITSUHIRO MASE, HARUMASA KASAI, KATUHIRO ...
Article type: Article
1997 Volume 53 Issue 8 Pages
1103-1110
Published: August 20, 1997
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A method was developed for performing dynamic contrast-enhanced T_1-weighted and R_2^* studies simultaneously to evaluate the regional hemodynamics of brain tumors. The dual dynamic contrast-enhanced images were obtained using a dual gradient echo(FFE)sequence with the keyhole technique to improve temporal resolution during a rapid bolus injection of Gd-DTPA. The dynamic T_1-weighted images were obtained from the first echo; moreover, dynamic ΔR_2^* images were calculated from the first and second echo images. The dynamic T_1-weighted study provided us with information about characteristic enhancement patterns(vascularity and permeability)of the brain tumors, and the dynamic R_2^* study provided a map of the blood pool of the brain.
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YUKIO KAWASHIMA, HIROKI YAMADA, KOJI SHIMADA, NORIYA YOKOHAMA, YOSHIKA ...
Article type: Article
1997 Volume 53 Issue 8 Pages
1111-1115
Published: August 20, 1997
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To evaluate cerebral microperfusion with spin echo T_2-weighted imaging, we performed T_2 dynamic MR imaging using half-Fourier acquisition with the single-shot turbo spin-echo (HASTE) sequence on a commercially available 1.0 Tesla whole body imaging system. Ten patients with cerebral vascular disease and ten normal control subjects were studied. For T_2 dynamic perfusion imaging, the HASTE sequence (TR/TE, 3000/87msec; FOV 210mm; slice thickness, 10mm; matrix size, 128h×256; one excitation) was used to acquire 30 consecutive images after the injection of Gd-DTPA (0.15mmol/kg) during 90 sec. All relative regional cerebral blood volume (rrCBV) maps showed good differentiation of gray and white matter without image degradation from the large veins and arteries in the cerebral surface. For the normal control subjects, the rrCBV ratio of the gray-white matter was 1.5±0.4. The signal reduction ratio (SRR) of the normal gray matter was significantly larger than that of the ischemic gray matter (p<0.05, df=34, two-sample t-test). In all patients, perfusion defect was detected in the core of infarction on the rrCBV map. The border zone showed delayed perfusion in three patients with major cerebral artery occlusion in dynamic T_2 relaxivity (ΔR_2) images. We could perform cerebral microperfusion imaging with T_2 dynamic MR imaging using the HASTE sequence on a clinically available 1.0 Tesla whole body MR system.
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SHINICHI GOTOH, KATSUHIKO AIKAWA, SHIGETOMO MATSUSHIMA
Article type: Article
1997 Volume 53 Issue 8 Pages
1116-1120
Published: August 20, 1997
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According to the supplier, the accuracy of the source strength of 192-iridium for high dose rate afterloaders is within the range of ±10%. To accurately determine the optimum dose for treatment, however, it is indispensable to calibrate the source strength at each institute. The authors experimentally measured the source strength of three different sources, at a source-detector distance of 8cm, by using a PMMA cylindrical phantom based on the DIN(Deutche Industrie Norm)protocol. According to the results, the source strength was within ±3.0% of the specification and the reproducibility of measurement was within 2.0%. Thus, the authors concluded that measurement using a PMMA cylindrical phantom with a fixed geometrical arrangement provides good reproducibility and is useful for measuring the source strength of iridium-192, which has a short source-detector distance.
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Article type: Appendix
1997 Volume 53 Issue 8 Pages
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Article type: Appendix
1997 Volume 53 Issue 8 Pages
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]
Article type: Article
1997 Volume 53 Issue 8 Pages
1122-
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Hiroshi Ohtakeno, Yoshinobu Kita, Hiroaki Tamada, Hidetoshi Yamasaki, ...
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1997 Volume 53 Issue 8 Pages
1123-
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Youichi Wada, Yuji Ishikawa, Takanori Hara, Yoshiyuki Matsubara
Article type: Article
1997 Volume 53 Issue 8 Pages
1124-
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Mitsuhiko HONMA, Tomoaki KONDOU, Toshihiko KATSU, Masato YAMASHITA, Ka ...
Article type: Article
1997 Volume 53 Issue 8 Pages
1125-
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Y Nishibata, M Hamada, M Inosaki, M Takeuchi, I Narabayashi
Article type: Article
1997 Volume 53 Issue 8 Pages
1126-
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Matsuji Hamada, Yutaka Nisibata, Mitsuhiko Inosaki, Masayasu Takeuti, ...
Article type: Article
1997 Volume 53 Issue 8 Pages
1127-
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Chiaki Nakanishi, Yoshio Horikawa, Yoshihiro Kagawa, Hiroaki Miyazawa
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1997 Volume 53 Issue 8 Pages
1128-
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N Yanagawa, H Katou, T Iimori, T Shirosaki, Y Fukuchi, T Isobe, H Naka ...
Article type: Article
1997 Volume 53 Issue 8 Pages
1129-
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Jirou Kayama, Noboru Takahashi, Seiya Urano, Masashi Andou, Junya Huku ...
Article type: Article
1997 Volume 53 Issue 8 Pages
1130-
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1997 Volume 53 Issue 8 Pages
1131-
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Takefumi Yamane, Yosiharu Hirata, Yosiyuki Hasimoto, Yosihiro Matuzaki ...
Article type: Article
1997 Volume 53 Issue 8 Pages
1132-
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Hwan CHEUNG, Sam Soo KIM
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1997 Volume 53 Issue 8 Pages
1133-
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S Moriyama, Y Hirata, T Yamaguchi, T Yamane, Y Matsuzaki, H Fujihara
Article type: Article
1997 Volume 53 Issue 8 Pages
1134-
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Yoshiharu Hirata, Tomomasa Yamaguchi, Takefumi Yamane, Yoshihiro Matsu ...
Article type: Article
1997 Volume 53 Issue 8 Pages
1135-
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Chika Tanaka, Keigo Hayashi, Toru Shibasaki, Akira Arima
Article type: Article
1997 Volume 53 Issue 8 Pages
1136-
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1997 Volume 53 Issue 8 Pages
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Yosuke Matuda
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1997 Volume 53 Issue 8 Pages
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Tsuyoshi Nishio, Yoshiharu Hirata, takash Kunioka, Kenichi Endou
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1997 Volume 53 Issue 8 Pages
1139-
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
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1997 Volume 53 Issue 8 Pages
1140-
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Yoshiharu Watanabe, Hidekazu Fujii, Katsuhisa Fujita, Hiroshi Tsuji
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1997 Volume 53 Issue 8 Pages
1141-
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Masaaki Kawahara, Yoshiharu Sukenobu, Michihiro Sasagaki, Kazuhiko Sat ...
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1997 Volume 53 Issue 8 Pages
1142-
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Makoto Watanabe, Katsunori Yabe, Osamu Ishikawa, Takaaki Ino, Hironori ...
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1997 Volume 53 Issue 8 Pages
1143-
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]
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1997 Volume 53 Issue 8 Pages
1144-
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Shigehisa Fujii, Syusaku Morita, Hiroshi Fujibuti
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1997 Volume 53 Issue 8 Pages
1145-
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Yasushige hori, Shigeo Natsuzumi, Tokuji Sasou, Yoshihisa Shingai, Mas ...
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1997 Volume 53 Issue 8 Pages
1146-
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Masaru Sekiya, Tomohiro Ohtake, Shouji Ishiguro
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1997 Volume 53 Issue 8 Pages
1147-
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Hiroyuki Fujiwara, Yosiharu Hirata, Takefumi Yamane, Yosihiro Matuzaki ...
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1997 Volume 53 Issue 8 Pages
1148-
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Kyung Mo CHUNG, Hong Jun PARK, Dal Gwan KWON
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1997 Volume 53 Issue 8 Pages
1149-
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hou De Cao, yong ming Wang
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1997 Volume 53 Issue 8 Pages
1150-
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Eiji Matsuda, Taizo Sanada, Go Hitomi, Koki Kakuba, Yoshiharu Kangai, ...
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1997 Volume 53 Issue 8 Pages
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Akira Sumida
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1997 Volume 53 Issue 8 Pages
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Akiko Hirukawa, Sinji Okumura, Chiaki Osaki, Munetaka Naitoh
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1997 Volume 53 Issue 8 Pages
1153-
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Masato Tatsumi, Toshiaki Matsuo, Makoto Katoh, Toshiyuki Kawazu
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1997 Volume 53 Issue 8 Pages
1154-
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Shigenobu Seguchi, yoshinobu Ishikawa, Kazuyoshi Kuwabara, Kiyomi Kawa ...
Article type: Article
1997 Volume 53 Issue 8 Pages
1155-
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Yutaka Yokota, Hiromichi Yokoyama, Kenzou Sugahara, Masaaki Hiura, Kiy ...
Article type: Article
1997 Volume 53 Issue 8 Pages
1156-
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Hirofumi Maruishi, Tadashi Sunayashiki, Atushi Takigawa
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1997 Volume 53 Issue 8 Pages
1157-
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