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Article type: Cover
2002 Volume 58 Issue 10 Pages
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Published: October 20, 2002
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Article type: Index
2002 Volume 58 Issue 10 Pages
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Article type: Index
2002 Volume 58 Issue 10 Pages
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[in Japanese]
Article type: Article
2002 Volume 58 Issue 10 Pages
I-
Published: October 20, 2002
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Article type: Appendix
2002 Volume 58 Issue 10 Pages
II-III
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Article type: Appendix
2002 Volume 58 Issue 10 Pages
IV-
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NORIYUKI HASHIOMOTO
Article type: Article
2002 Volume 58 Issue 10 Pages
1297-1302
Published: October 20, 2002
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HITOSHI YOSHIMURA
Article type: Article
2002 Volume 58 Issue 10 Pages
1303-1310
Published: October 20, 2002
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Hiroyasu Soeda
Article type: Article
2002 Volume 58 Issue 10 Pages
1311-1319
Published: October 20, 2002
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Shinji Hirohashi
Article type: Article
2002 Volume 58 Issue 10 Pages
1320-1327
Published: October 20, 2002
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Shuji Yonei, Qiu-Mei Zhang
Article type: Article
2002 Volume 58 Issue 10 Pages
1328-1334
Published: October 20, 2002
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Nobuya Kawahata
Article type: Article
2002 Volume 58 Issue 10 Pages
1335-1343
Published: October 20, 2002
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YOSHIHARU WATANABE
Article type: Article
2002 Volume 58 Issue 10 Pages
1344-1351
Published: October 20, 2002
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KATSUMI TSUJIOKA
Article type: Article
2002 Volume 58 Issue 10 Pages
1352-1356
Published: October 20, 2002
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M Ishifuro
Article type: Article
2002 Volume 58 Issue 10 Pages
1357-1358
Published: October 20, 2002
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YOSHIYUKI ISHIMORI
Article type: Article
2002 Volume 58 Issue 10 Pages
1359-1360
Published: October 20, 2002
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[in Japanese]
Article type: Article
2002 Volume 58 Issue 10 Pages
1361-1363
Published: October 20, 2002
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MITSUHIRO GOTO
Article type: Article
2002 Volume 58 Issue 10 Pages
1364-1368
Published: October 20, 2002
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HIROYUKI NAGASHIMA, HAJIME SAKAMOTO, YOSHITOMO SANO, AKIHISA SHIRAISHI ...
Article type: Article
2002 Volume 58 Issue 10 Pages
1369-1376
Published: October 20, 2002
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Most contrast agents used in digital subtraction angiography (DSA) are non-ionic iodinated contrast agents, which can cause severe side effects in patients with contraindications for iodine or allergic reactions to iodine. Therefore, DSA examinations using carbon dioxide gas or examinations done by magnetic resonance imaging (MRI) and ultrasound (US) were carried out in these patients. However, none of these examinations provided mages as clear as those of DSA with an iodinated contrast agent. We experienced DSA examination using a gadolinium contrast agent in a patient contraindicated for iodine. The patient had undergone MRI examination with a gadolinium contrast agent previously without side effects. The characteristics of gadolinium and the iodinated contrast agent were compared, and the DSA images obtained clinically using these media were also evaluated. The signal-to-noise (SN) ratio of the gadolinium contrast agent was the highest at tube voltages of 70 to 80 kilovolts and improved slightly when the image intensifier (I.I.)entrance dose was greater than 300μR (77.4 nC/kg). The dilution ratios of five iodinated contrast agents showed the same S/N value as the undiluted gadolinium contrast agent. Clinically, the images obtained showed a slight decrease in contrast but provided the data necessary to make a diagnosis and made it possible to obtain IVR without any side effects. DSA examinations using a gadolinium contrast agent have some benefit with low risk and are thought to be useful for patients contraindicated for iodine.
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SEIICHIRO OHNO, IZUMI TOGAMI, TAKUICHI KITAYAMA, YOSHIHIRO OHKAWA, HIS ...
Article type: Article
2002 Volume 58 Issue 10 Pages
1377-1382
Published: October 20, 2002
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We evaluated the gradient echo (GRE) Dixon method in metastatic bone tumors using a low-field MRI scanner (0.2 Tesla). This method is characterized by the double echo sequence of in-phase and opposed-phase. Studies were carried out on a phantom, 14 healthy volunteers, and clinical examples (33 vertebral bodies)using the T_1-weighted spin echo, T_2-weighted turbo spin echo, and GRE Dixon methods. Further, we obtained addition and subtraction images from the double echo sequence. In the clinical examples, the contrast-to-noise ratio (CNR) of the subtraction images (51.3±24.1) was significantly better than that of the T_1-SE images (6.7±3.1, p<0.0001 ). For the examination of metastatic bone marrow tumors using a low-field MRI scanner(0.2 Tesla), subtraction images are thought to be the most effective.
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SHUICH HENMI
Article type: Article
2002 Volume 58 Issue 10 Pages
1383-1392
Published: October 20, 2002
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The purpose of this study was to clarify the psychological influence of optical illusion on the photographic density of the brain in head CT images. In this study, I attempted to compare the visual impression of photographic density of the brain using visual subjective evaluation according to observers and cases. The results showed that the visual impression of photographic density of the brain at cerebellar CT depended upon the mode of appearance of the optical illusion (assimilation, contrast, picture frame effect, etc.). In addition, that impression varied according to differences in cases (difference of picture pattern) and observers. Further, it was clarified that the optical illusion had been observed according to individual differences among observers. Moreover, cases could be divided into two main classes. Some cases were recognized as a kind of outline figure (the white skull was recognized as an induction color, and the brain as a non-induction color) with assimilation, and consequently the brain seemed whitish. In other cases (the white skull was not recognized as an induction color) in which there was no assimilation, the brain did not seem whitish. This was considered to have occurred because the degree of influence of the skull on the visual impression of the photographic density of the brain had changed according to differences in cases.
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YUJI KONDO
Article type: Article
2002 Volume 58 Issue 10 Pages
1393-1401
Published: October 20, 2002
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The purpose of this study was to utilize a mobile phone for transferring medical images to a specialist at a remote site in emergency care. CT images obtained in emergency treatment are transmitted via the Internet or mobile phone(CDMA : Code Division Multiple Access communication method). A specialist even at a remote mobile site may receive the appended images of e-mail sent via mobile phone to his PDA (Personal Digital Assistant, image indicator). The images are originally obtained in DICOM format by CT, and are then converted to JPEG format. To reduce transmission time, the JPEG files can be compressed without causing undue deterioration in image quality. To evaluate the quality of images received at the remote site, images were compressed at 25, 40, 50, 60, 70 and 80% compression ratios and transmitted to a PDA via the Internet and a mobile phone or a mobile phone alone. Image quality was visually evaluated by BVC analysis. The analysis revealed that the image compression ratio must be at least 50% for diagnosis. Considering the transmission speed, a 50% compression ratio was considered the most suitable for this application.
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TAKESHI TSUZUKI, HIDENORI KAMESHIMA, MASANAO KOBAYASHI, SYOUICHI SUZUK ...
Article type: Article
2002 Volume 58 Issue 10 Pages
1402-1410
Published: October 20, 2002
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The monitor chamber of a radiotherapy system needs to be calibrated once a week. Because the calibration procedure requires a large variety of complicated calculations, we have developed software that facilitates calculation and enables comparison and storage of data. According to the standard measurement of absorbed dose, we used Visual Basic 6.0 (Microsoft Corp.)to establish the calibration method. This new technique has simplified the conventional intricate calculation required for calibration of the monitor chamber and enabled automatic processing of calculated results. We have confirmed the usefulness of this software in calibrating the monitor chamber. In the routine inspection, we can compare the current data with former results. Because of this advantage, it is possible to eliminate serious accidents such as overdosing and underdosing.
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Tomoko Matsubara
Article type: Article
2002 Volume 58 Issue 10 Pages
1411-
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Article type: Appendix
2002 Volume 58 Issue 10 Pages
1412-1413
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Article type: Appendix
2002 Volume 58 Issue 10 Pages
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Article type: Appendix
2002 Volume 58 Issue 10 Pages
1414-
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Article type: Appendix
2002 Volume 58 Issue 10 Pages
1415-1418
Published: October 20, 2002
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Article type: Appendix
2002 Volume 58 Issue 10 Pages
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Article type: Appendix
2002 Volume 58 Issue 10 Pages
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Article type: Appendix
2002 Volume 58 Issue 10 Pages
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Article type: Appendix
2002 Volume 58 Issue 10 Pages
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Article type: Cover
2002 Volume 58 Issue 10 Pages
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