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Article type: Cover
2000 Volume 56 Issue 8 Pages
Cover27-
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Article type: Cover
2000 Volume 56 Issue 8 Pages
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Article type: Index
2000 Volume 56 Issue 8 Pages
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Article type: Index
2000 Volume 56 Issue 8 Pages
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[in Japanese]
Article type: Article
2000 Volume 56 Issue 8 Pages
I-
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Article type: Appendix
2000 Volume 56 Issue 8 Pages
II-V
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2000 Volume 56 Issue 8 Pages
VI-
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2000 Volume 56 Issue 8 Pages
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2000 Volume 56 Issue 8 Pages
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2000 Volume 56 Issue 8 Pages
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2000 Volume 56 Issue 8 Pages
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2000 Volume 56 Issue 8 Pages
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2000 Volume 56 Issue 8 Pages
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2000 Volume 56 Issue 8 Pages
X-
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2000 Volume 56 Issue 8 Pages
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2000 Volume 56 Issue 8 Pages
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2000 Volume 56 Issue 8 Pages
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2000 Volume 56 Issue 8 Pages
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2000 Volume 56 Issue 8 Pages
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2000 Volume 56 Issue 8 Pages
XIV-XV
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2000 Volume 56 Issue 8 Pages
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ATSUSHI MOMOSE
Article type: Article
2000 Volume 56 Issue 8 Pages
985-991
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NOBUO OKAZAKI
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2000 Volume 56 Issue 8 Pages
992-995
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MITSUOMI MATSUMOTO
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2000 Volume 56 Issue 8 Pages
996-997
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KOICHI OGAWA
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2000 Volume 56 Issue 8 Pages
998-1003
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YOSHIHARU HIRATA
Article type: Article
2000 Volume 56 Issue 8 Pages
1004-1009
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TSUKASA DOI, [in Japanese], [in Japanese], [in Japanese], [in Japanese ...
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2000 Volume 56 Issue 8 Pages
1010-1011
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[in Japanese]
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2000 Volume 56 Issue 8 Pages
1011-1013
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[in Japanese]
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2000 Volume 56 Issue 8 Pages
1014-1015
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[in Japanese]
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2000 Volume 56 Issue 8 Pages
1016-1017
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[in Japanese]
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2000 Volume 56 Issue 8 Pages
1017-1019
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[in Japanese]
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2000 Volume 56 Issue 8 Pages
1020-1021
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[in Japanese]
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2000 Volume 56 Issue 8 Pages
1021-1025
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NAOKI KODAMA
Article type: Article
2000 Volume 56 Issue 8 Pages
1026-1028
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YUJI NOGUCHI
Article type: Article
2000 Volume 56 Issue 8 Pages
1029-1032
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HIROSHI INOUE, KOUJI HAYASHI
Article type: Article
2000 Volume 56 Issue 8 Pages
1033-1038
Published: August 20, 2000
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It has been demonstrated in a simulation that diffusion is an important component in determining T_2^* contrast. When a high-susceptibility agent permeates from intravascular to extracellular space, the changes in its spatial distribution affect the signal intensity of T_2^*-weighted images so as to potentially represent a diffusion process. To experimentally demonstrate the effects of permeation on T_2^*-weighted images, we assessed the dynamic changes in T_2^* signal after a bolus injection of Gd-DTPA(Magnevist:Schering)solution into a hollow fiber dialyzer as a phantom of intravascular and extracellular space. The signal intensity of the hollow fiber dialyzer in gradient-echo images was compared with that in spin-echo images.
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SEIICHIRO OHNO, IZUMI TOGAMI, NOBUYA SASAI, TAKUICHI KITAYAMA, YOSHIHI ...
Article type: Article
2000 Volume 56 Issue 8 Pages
1039-1043
Published: August 20, 2000
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Previous studies on kinematic MRI of the shoulder using cylindrical-type MRI systems were limited to internal or external rotation. The open-type MRI system enables kinematic MRI to be carried out for the abductive position, and is expected to permit evaluation of the superior and inferior glenoid labrum. It is important to evaluate the superior and inferior glenoid labrum in cases of sports injuries(baseball, tennis, etc.). We evaluated the superior and inferior glenoid labrum for abductive motion in asymptomatic healthy volunteers as a preliminary study. As the abduction angle increased, the superior labrum moved into the joint space. Its shape changed from round or triangular to crescent(p<0.0001), and there was increased signal for larger abduction angles(p<0.0001). On the other hand, the shape of the inferior labrum tended to change from crescent to triangular or round(p<0.0001). Increased signal was seen in the inferior labrum on about half the shoulders(N.P.). This did not change as the abduction angle increased. Our results define normal patterns for the superior and inferior glenoid labrum on abductive kinematic MRI in healthy volunteers. Abductive kinematic studies using an open-type MRI system, which permits dynamic evaluation of the superior and inferior glenoid labrum, are expected to be useful for various patients with sports injuries.
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HARUTAKA HISANO, KONOMU URABE, AKINORI HIROKI, KAZUYUKI ABE, TOMONORI ...
Article type: Article
2000 Volume 56 Issue 8 Pages
1044-1051
Published: August 20, 2000
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The purpose of this study was to estimate the influence of high gall bladder uptake in Technetium-99m myocardial SPECT imaging and to establish improvements of artifacts for better image quality and quantitativeness. In the phantom studies, artifactual defects were observed in the posterior, inferior, and anterior walls when the myocardium/gall bladder radioactive ratio increased(more than 1:1), and they were markedly demonstrated when the ratio increased further(more than 1:2). Marked artifactual defects were also observed when setting gall bladder activity in the myocardial reconstruction area. Although relative activity in myocardial SPECT images increased when the gall bladder was masked, counts in defect areas yielded by artifact did not increase, indicating that quantitativeness was not improved. Masking of gall bladder activity on the projection data was necessary for improvement of image quality and quantity. We examined countermeasures for promoting bile excretion and the "right lateral bending position" in the clinical studies. Radioactivity was decreased 60.2% in the gall bladder and 49.7% in the hepatic bile duct by excreting bile. These counts were increased 50.91% in the apex and 43.55% in the inferior wall by the right lateral bending position. We concluded that we could obtain more accurate image quality and quantitativeness by either promoting bile excretion or using the right lateral bending position.
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NOBUHIRO YOSHIDA
Article type: Article
2000 Volume 56 Issue 8 Pages
1052-1057
Published: August 20, 2000
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The QGS program is software for highly reproducible evaluation of perfusion in cardiac muscles and cardiac functions, but basic data collection and processing conditions affect the output values of cardiac function analyses. Because these conditions have not been sufficiently evaluated, we determined in this study the optimum cut off, data collection time, and R-R fractions by comparing the outputs calculated from data obtained with a phantom using QGS with the phantom volume. The optimum cut off was 0.41-0.55 cycle/cm in 8 R-R fractions and 0.41-0.52 cycle/cm in 16 R-R fractions. The values calculated using QGS were underestimated by 11.4% compared with the phantom volume. With longer data collection times, statistical errors were smaller. Errors of data collection in 8 fractions over a period of 20 min were about the same as those in 16 fractions over a period of more than 25 min. Comparison between 8 fractions and 16 fractions in EF levels of patients demonstrated that errors were significantly smaller by 3% in 8 fractions than in 16 fractions, and the level was closer to E/G in 16 fractions than in 8 fractions.
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YUICHIRO NARITA, HIDEYO ISHIGAKI, YOSHIHISA AKIYAMA, YASUO SATOU, FUJI ...
Article type: Article
2000 Volume 56 Issue 8 Pages
1058-1068
Published: August 20, 2000
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The shielding of diagnostic x-rays in medical facilities is expected to be estimated according to effective dose based on the Enforcement Regulations of the Medical Service Law, which to be amended in the near future. The method of calculation provided in this paper takes account of three types of radiation, primary, scatter, and leakage, for each radiation source, to estimate effective dose in the controlled area of a medical facility. X-ray data such as transmission, kerma in air, conversion factor, scatter fraction, and half-value layer were adjusted to estimate the shielding accurately. Estimations of x-ray shielding using effective dose were performed at our existing diagnostic x-ray facility as a model for a single x-ray tube and combined radiation resulting from multiple x-ray tubes. Effective doses estimated at the border of the controlled area ranged from 0.7 to 29.2 mSv per three months, meeting the effective dose limit defined by new the regulations of 1.3 mSv per three months. Results also indicated that exposure to combined radiation can be estimated.
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Article type: Appendix
2000 Volume 56 Issue 8 Pages
1069-1071
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Article type: Appendix
2000 Volume 56 Issue 8 Pages
1072-1073
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Article type: Appendix
2000 Volume 56 Issue 8 Pages
1074-
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Article type: Cover
2000 Volume 56 Issue 8 Pages
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