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Article type: Cover
2005 Volume 61 Issue 11 Pages
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Article type: Index
2005 Volume 61 Issue 11 Pages
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Article type: Index
2005 Volume 61 Issue 11 Pages
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[in Japanese]
Article type: Article
2005 Volume 61 Issue 11 Pages
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Article type: Appendix
2005 Volume 61 Issue 11 Pages
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Article type: Appendix
2005 Volume 61 Issue 11 Pages
2-3
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Article type: Appendix
2005 Volume 61 Issue 11 Pages
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Article type: Appendix
2005 Volume 61 Issue 11 Pages
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Article type: Appendix
2005 Volume 61 Issue 11 Pages
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Article type: Appendix
2005 Volume 61 Issue 11 Pages
7-8
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MIEKO KOBUYA
Article type: Article
2005 Volume 61 Issue 11 Pages
1467-1474
Published: November 20, 2005
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HIROSHI NARIMATSU
Article type: Article
2005 Volume 61 Issue 11 Pages
1475-1485
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HISASHI OKA
Article type: Article
2005 Volume 61 Issue 11 Pages
1486-1489
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SHIGEO MATSUDA
Article type: Article
2005 Volume 61 Issue 11 Pages
1490-1495
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HIROOMI SUMIDA
Article type: Article
2005 Volume 61 Issue 11 Pages
1496-1501
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HIROYUKI KUBOTA
Article type: Article
2005 Volume 61 Issue 11 Pages
1502-1509
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YASUKI ASADA, [in Japanese], [in Japanese], [in Japanese], [in Japanes ...
Article type: Article
2005 Volume 61 Issue 11 Pages
1510-1516
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[in Japanese]
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2005 Volume 61 Issue 11 Pages
1516-1518
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[in Japanese]
Article type: Article
2005 Volume 61 Issue 11 Pages
1518-1519
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[in Japanese]
Article type: Article
2005 Volume 61 Issue 11 Pages
1519-1520
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TORU YAMAUCHI, [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
2005 Volume 61 Issue 11 Pages
1521-1528
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TOSHIO TAKIGUCHI
Article type: Article
2005 Volume 61 Issue 11 Pages
1529-1530
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NORIYUKI TAKAHASHI, YONGBUM LEE, DU YIH TSAI, KIYOSHI ISHII, SOUICHIRO ...
Article type: Article
2005 Volume 61 Issue 11 Pages
1531-1541
Published: November 20, 2005
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Detection of early infarct signs on nonenhanced CT is mandatory in patients with acute ischemic stroke. Loss of the gray-white matter interface at the lentiform nucleus or the insular ribbon has been an important early infarct sign, which affects decisions on thrombolytic therapy. However, its detection is difficult, since early infarct sign is of subtle hypoattenuation. To improve the detectability of early infarct sign, image processing that could reduce local noise while preserving edges is desirable. To examine this issue, we devised an adaptive partial smoothing filter (APSF). Since the APSF markedly improves visibility of the normal gray-white matter interface, loss of the gray-white matter interface due to hypoattenuation could be more easily detected. The APSF was applied to clinical CT images in hyperacute stroke patients. Our preliminary results showed that the visibility and detectability of early infarct signs was much improved. To validate the usefulness of the proposed method, two commonly used smoothing filters were also employed for comparison. The results demonstrated the superiority of the APSF. Our proposed APSF can improve the visibility of the gray-white matter interface, thereby enhancing the detectability of early infarct signs.
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HISATERU OHBA, KATSUHIKO OGASAWARA, TAMIO ABURANO
Article type: Article
2005 Volume 61 Issue 11 Pages
1542-1550
Published: November 20, 2005
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In this study, a questionnaire survey was carried out to determine the actual situation of radiation safety management systems in Japanese medical institutions with nuclear medicine facilities. The questionnaire consisted of questions concerning the Radiation Protection Supervisor license, safety management organizations, and problems related to education and training in safety management. Analysis was conducted according to region, type of establishment, and number of beds. The overall response rate was 60%, and no significant difference in response rate was found among regions. Medical institutions that performed nuclear medicine practices without a radiologist participating accounted for 10% of the total. Medical institutions where nurses gave patients intravenous injections of radiopharmaceuticals as part of the nuclear medicine practices accounted for 28% of the total. Of these medical institutions, 59% provided education and training in safety management for nurses. The rate of acquisition of Radiation Protection Supervisor licenses was approximately 70% for radiological technologists and approximately 20% for physicians (regional difference, p=0.02). The rate of medical institutions with safety management organizations was 71% of the total. Among the medical institutions (n=208) without safety management organizations, approximately 56% had 300 beds or fewer. In addition, it became clear that 35% of quasi-public organizations and 44% of private organizations did not provide education and training in safety management (p<0.001, according to establishment).
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ISAO MURO, TARO TAKAHARA, TOMOHIKO HORIE, MASATOSHI HONDA, AKIRA KAMIY ...
Article type: Article
2005 Volume 61 Issue 11 Pages
1551-1558
Published: November 20, 2005
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Diffusion weighted imaging (DWI) theoretically aims to detect random motion over small distances, such as Brownian motion. Therefore, breath-hold scanning has been considered the only way to acquire DWI in the body without artifacts from bulk motion. Recent reports suggest that non-breath-hold scanning is feasible. The purpose of this study was to evaluate the influence of respiratory motion on DWI using a moving phantom model. Our results showed that the difference in apparent diffusion coefficient (ADC) was less than 10% between a static phantom and a moving phantom. There was no relation between the speed and stroke of the moving phantom and the calculated ADC. The results indicate that stable motion such as calm respiration does not cause signal loss on DWI, in contrast to intra-voxel incoherent motion (IVIM). The images obtained using this method showed high resolution and signal-to-noise ratio (SNR), suitable for three-dimensional display of the lesion.
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HIROFUMI HONDA, KENJI KAMEDA
Article type: Article
2005 Volume 61 Issue 11 Pages
1559-1565
Published: November 20, 2005
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The angiography equipment Infinix Celeve of Toshiba Corp. is a system that estimates patient absorbed dose at the skin by using a dose area product meter. This system performs incidence area compensation, which corresponds to the changes of I.I. size, FID, and FTD. We evaluated the clinical usefulness of patient entrance skin dose management by the dose area product meter of Celeve by verifying the effects of various clinical parameters on absorbed dose. We determined compensation according to the various angles usually used by clinicians, and estimated the absorbed peak dose at the skin. By using the angle compensation of the C arm, the displayed values on the dose area product meter of Celeve could be used for skin doses as they were. The skin absorbed dose was 3.0 Gy or more in 33 of the 332 examples.
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Article type: Appendix
2005 Volume 61 Issue 11 Pages
1566-1567
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Article type: Appendix
2005 Volume 61 Issue 11 Pages
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Article type: Appendix
2005 Volume 61 Issue 11 Pages
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Article type: Appendix
2005 Volume 61 Issue 11 Pages
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Article type: Appendix
2005 Volume 61 Issue 11 Pages
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Article type: Appendix
2005 Volume 61 Issue 11 Pages
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Article type: Appendix
2005 Volume 61 Issue 11 Pages
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Article type: Appendix
2005 Volume 61 Issue 11 Pages
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Article type: Appendix
2005 Volume 61 Issue 11 Pages
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Article type: Appendix
2005 Volume 61 Issue 11 Pages
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Article type: Cover
2005 Volume 61 Issue 11 Pages
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