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1999 Volume 55 Issue 12 Pages
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1999 Volume 55 Issue 12 Pages
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1999 Volume 55 Issue 12 Pages
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Article type: Bibliography
1999 Volume 55 Issue 12 Pages
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[in Japanese]
Article type: Article
1999 Volume 55 Issue 12 Pages
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Article type: Appendix
1999 Volume 55 Issue 12 Pages
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1999 Volume 55 Issue 12 Pages
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1999 Volume 55 Issue 12 Pages
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1999 Volume 55 Issue 12 Pages
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1999 Volume 55 Issue 12 Pages
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1999 Volume 55 Issue 12 Pages
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1999 Volume 55 Issue 12 Pages
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1999 Volume 55 Issue 12 Pages
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1999 Volume 55 Issue 12 Pages
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Article type: Appendix
1999 Volume 55 Issue 12 Pages
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1999 Volume 55 Issue 12 Pages
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Article type: Appendix
1999 Volume 55 Issue 12 Pages
XVI-XIX
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KEIGO ENDO
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1999 Volume 55 Issue 12 Pages
1145-1147
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AKIRA HAGIWARA
Article type: Article
1999 Volume 55 Issue 12 Pages
1148-1149
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SHOJI SUZUKI
Article type: Article
1999 Volume 55 Issue 12 Pages
1149-1152
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TSUNEO TAKEI
Article type: Article
1999 Volume 55 Issue 12 Pages
1152-1156
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YOSHIHISA MURAMATSU, [in Japanese], [in Japanese], [in Japanese], [in ...
Article type: Article
1999 Volume 55 Issue 12 Pages
1156-1161
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KATSUHEI HORITA
Article type: Article
1999 Volume 55 Issue 12 Pages
1162-1166
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TOSHIAKI MIYATI, [in Japanese], [in Japanese], [in Japanese], [in Japa ...
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1999 Volume 55 Issue 12 Pages
1167-1179
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KAZUTAKA MASUDA, [in Japanese], [in Japanese], [in Japanese], [in Japa ...
Article type: Article
1999 Volume 55 Issue 12 Pages
1180-1184
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Medical Information System Subcommittee
Article type: Article
1999 Volume 55 Issue 12 Pages
1185-1202
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JOJI KATO
Article type: Article
1999 Volume 55 Issue 12 Pages
1203-1209
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[in Japanese]
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1999 Volume 55 Issue 12 Pages
1210-1213
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SABURO KAKIUCHI
Article type: Article
1999 Volume 55 Issue 12 Pages
1214-1218
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HIROAKI MIMURA, TATSUSHI TOMOMITSU, SHINICHI YANAGIMOTO, TETSUYA ISHIK ...
Article type: Article
1999 Volume 55 Issue 12 Pages
1219-1225
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Both fundamental and clinical studies were performed to improve the precision with which split renal clearance is calculated from the relation between renal clearance and the total renal uptake rate by using ^<99m>Tc-MAG_3, which is mainly excreted into the proximal renal tubules. In the fundamental study, the mostsuitable kidney phantom threshold values for the extracted renal outline were investigated with regard tosize, radioactivity, depth of the kidney phantom, and radioactivity in the background. In the clinical study,suitable timing to obtain additional images for making the ROI and the standard point for calculation ofrenal uptake rate were investigated. The results indicated that, although suitable threshold values were dis-tributed from 25% to 45%, differences in size, solution activity, and the position of the phantom or BG activity did not have significant effects. Comparing 1-3 min with 2-5 min as the time for additional imagesfor ROI, we found that renal areas using the former time showed higher values, and the correlation coefficient of the regression formula improved significantly. Comparison of the timing for the start of data acquisition with the end of the arterial phase as a standard point of calculating renal uptake rate showed improvement in the latter.
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MITSUJI HIGASHIDA, MASARU YAMAZAKI, NOBUKO HANAOKA, MASACHIKA SHOUGAKI ...
Article type: Article
1999 Volume 55 Issue 12 Pages
1226-1231
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We devised a new method of Mobi-track MRA by applying the conventional CP body array coil and our own sliding table. This method was applied for MR angiography of lower leg arteries combined with a subtraction technique. The performance of our method, which uses the CP body array coil, was examined in regard to misregistration of difference images, signal-to-noise ratio, contrast-to-noise ratio, and signal detectability, for comparison with that of the method using the body coil. Experimental results showed that our new method was superior to the method using the body coil. In conclusion, we consider our new method, which employs the CP body array coil and sliding table, to be very useful for three-dimensional MR angiography of lower leg arteries.
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YUSHI HIRANO, HIRONOBU MATSUYA, MlZUO IRIYAMA, EMI SASAKI, MlCHIAKI Hl ...
Article type: Article
1999 Volume 55 Issue 12 Pages
1232-1238
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The purpose of this study was to evaluate the ability of three-dimensional helical CT(3D-CT) to depict gastric cancer. Depiction was evaluated in terms of elevations or depressions and tumor size. Elevation heights and depression depths were assessed using a gel-made phantom, while changing the scanning parameters of slice thickness, table-feed speed, and threshold of the CT value. For the measurement of tumor size, we first determined the appropriate critical parameters, since tumor size is greatly influenced by these parameters. A double-contrast medium, endoscopic images, and surgical stomach specimens were used to measure actual tumor sizes. The results showed that, since 3D-CT images can be taken from any angle, a clear picture of gastric cancer can be obtained without superimposition from the spine and colon gas. A good correlation was obtained between tumor size on 3D-CT images and measured size of tumors in the specimens, indicating that 3D-CT is useful for measuring the size of primary lesions of gastric cancer. The results suggest that 3D-CT could be a new modality for the examination of gastric cancer.
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HIROYOSHI IMURA, AKIKO ITO, HlROKI ISHII, HIROFUMI YAGI
Article type: Article
1999 Volume 55 Issue 12 Pages
1239-1246
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We previously reported that crossover light influenced the shape of the characteristic curve of ortho-film. In this study, we examined the influence of crossover light on the shape of the characteristic curve of new ortho-film, and found an influence on some new ortho-films. Those films that were influenced had the same kind of emulsion as that of film coated in a double layer. The main influence on the shape of the curve was not the difference in spectrum between primary and crossover light but rather the difference in incident direction between those lights entering into an emulsion. The influence of the difference in incident direction was examined by using film with simulated double-layer coatings that we ourselves produced. Change in the sensitivity difference of the constituent emulsion was noted in accordance with the difference in direction when the lights entered the emulsion from the surface and base as primary and crossover light did. Therefore, the shape of the characteristic curve of film with a double-layer coating changed according to the synthesis of each constituent emulsion's characteristic curve. Consequently, the cause of differences in the shape of the characteristic curve made by primary and crossover lights was twofold: (1) the difference in incident direction to an emulsion between primary and crossover light and(2) the film emulsion coated in a double layer with various properties.
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MICHIKO CHIBA, TOSHIO TSUCHIHASHI, TAKESHI SUZUKI
Article type: Article
1999 Volume 55 Issue 12 Pages
1247-1251
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We have pointed out a number of problems with the Smart Prep technique as used in initial clinical practice. A number of measures to solve these problems were evaluated and applied to clinical practice to determine their effectiveness, (1) In cases in which scan start timing was too early, the cause was assumed to be the monitoring of a signal other than the target vessel. The tracking volume was set for the ascending aorta to counter the problem. In addition, two to three continuous scans were performed during one breath hold. Good MRA images were obtained in all cases as a result of this modification. (2) In cases in which scan start timing was too late, the cause was assumed to be deviation of the tracking volume from the target vessel. In order to solve this problem, the average scan start time of the target vessel was calculated, and this value was used to set the fail-limit time. Good quality MRA images were obtained in cases for which the scan time was started at the fail-limit time when operation was not triggered by the Smart Prep technique.
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Article type: Appendix
1999 Volume 55 Issue 12 Pages
1252-1253
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Article type: Appendix
1999 Volume 55 Issue 12 Pages
1254-1255
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Article type: Appendix
1999 Volume 55 Issue 12 Pages
1256-1257
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1999 Volume 55 Issue 12 Pages
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1999 Volume 55 Issue 12 Pages
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Article type: Index
1999 Volume 55 Issue 12 Pages
1259-1263
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Article type: Index
1999 Volume 55 Issue 12 Pages
1264-1269
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Article type: Appendix
1999 Volume 55 Issue 12 Pages
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1999 Volume 55 Issue 12 Pages
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Article type: Appendix
1999 Volume 55 Issue 12 Pages
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1999 Volume 55 Issue 12 Pages
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Article type: Cover
1999 Volume 55 Issue 12 Pages
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