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Article type: Cover
1993 Volume 49 Issue 9 Pages
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Article type: Index
1993 Volume 49 Issue 9 Pages
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Article type: Index
1993 Volume 49 Issue 9 Pages
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Article type: Appendix
1993 Volume 49 Issue 9 Pages
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1993 Volume 49 Issue 9 Pages
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ATSUNORI OKADA, MASAYUKI NAKAJO, SEIYA SHIGAKI, YUKI HORIE, KOUSEI ISI ...
Article type: Article
1993 Volume 49 Issue 9 Pages
1601-1608
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A comparative 360°/180°data aquisition study with a myocardial phantom was performed to detect a suitable data sampling technique for myocardial emission computed tomography using thallium-201. The homogeneous distribution of radioative is more frequently shown in the 180°data sampling technique than 360°data sampling techniqe for all the experimental studies, especially in the seputum and posterior/inferior areas than in other myocrdial areas. It was concluded that the 360°data sampling technique is superior to the 180°technique in evaluating myocardial perfusion imaging using thalllim-201.
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OSAMU UEDA, TATSUHIKO ASHIHARA, SEIJI WAKE, MASATO TSURU, ICHIRO IZAWA ...
Article type: Article
1993 Volume 49 Issue 9 Pages
1609-1615
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To determine the data acquisition timing on the SPECT of the brain using 99mTc-ECD, the changes in the brain distribution of the tracer were examined in 10 patients with cerebrovascular disease (CVD) and 4 patients with neurological degenerative disease. Immediately after I. V. administration of 99mTc-ECD with a dose of 740 MBq, the dynamic planar images (5 sec/frame×60 frames) and consecutive early 6 SPECT images (5 sec/view×64 views each) were obtained. The delayed SPECT images (30 sec/view×64 views) were taken 3hr after injection. The following parameters were evaluated : 1) the whole brain time-activity curve of 99mTc-ECD; 2) the count of the region of interest (ROI) placed in the frontal lobe, temporal lobe, occipital lobe, parietal lobe, and cerebellum; 3) the count ratio of the lesion to the counterpart of the unaffected side, and to the ipsilateral cerebellum in CVD patients ; and 4) the changes in the intra-cranial background and the extra-cranial background, where the former was expressed as the count ratio of the ventricle to gray matter and the latter as the count ratio of the peri-cranial regions to the whole brain. The whole brain time-activity curves of 99mTc-ECD demonstrated a rapid raise in the uptake after the tracer injection and a subsequent plateau 3 min after the injection. A washout of 99mTc-ECD was minimal in all ROIs during the period on the early 6 SPECT images. The count ratio of the lesion to the normal areas was constant on both early and delayed SPECT images. The intra-cranial background activity was unchanged during the whole periods, while the extra-cranial background activity reduced with time. These results suggested that the data acquisition of brain SPECT with 99mTc-ECD could be initiated 5min after the tracer injection.
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YUUJI ENDOH, HIDEO ITOH, KATSUHIKO ABE, KAZUYOSHI SAKANISHI, YOUICHI Y ...
Article type: Article
1993 Volume 49 Issue 9 Pages
1616-1623
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The deterministic effect has been mainly discussed for radiation risk in the field of radiotherapy. On the other hand, as the care rate for radiotherapy is increasing the stochastic effect will become more important for radiotherapy patients. Especially, the mean bone marrow dose will be more important for calucuration of population dose. In this paper, tissue or organ dose to estimate the radiation risk for several radiotherapy technique was measured using Rando phantom and TLD tips. The mean bone marrow dose per target absorbed dose of 1000 cGy was calculated. As the results, the mean bone marrow dose include irradiated volume was as follow : right angled two fields irradiation for maxillary sinus; 20.7 cGy, two opposed fields irradiation for larynx; 11.0 cGy, two opposed fields irradiation for mediastinum; 91.0 cGy, rotation irradiation for esophagus; 38.5 cGy, two opposed fields irradiation for whole pelvis; 200.3 cGy, inverted Y opposed two fields irradiation for lower abdomen; 276.2 cGy. In contradistinction, the mean bone marrow dose outside of the irradiated volume was as follow : right angled two fields irradiation for maxillary sinus; 4.8cGy, two opposed fields irradiation for larynx; 2.8 cGy, two opposed fields irradiation for mediastinum; 6.4 cGy, rotation irradiation for esophagus; 18.2 cGy, two opposed fields irradiation for whole pelvis; 19.3 cGy, inverted Y opposed two fields irradiation for lower abdomen; 36.0 cGy.
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Article type: Appendix
1993 Volume 49 Issue 9 Pages
1624-1637
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1993 Volume 49 Issue 9 Pages
1638-
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Article type: Article
1993 Volume 49 Issue 9 Pages
1638-
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1993 Volume 49 Issue 9 Pages
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Article type: Article
1993 Volume 49 Issue 9 Pages
1639-
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Article type: Article
1993 Volume 49 Issue 9 Pages
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Article type: Article
1993 Volume 49 Issue 9 Pages
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Article type: Article
1993 Volume 49 Issue 9 Pages
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1993 Volume 49 Issue 9 Pages
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1993 Volume 49 Issue 9 Pages
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1993 Volume 49 Issue 9 Pages
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1993 Volume 49 Issue 9 Pages
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1993 Volume 49 Issue 9 Pages
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Article type: Article
1993 Volume 49 Issue 9 Pages
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1993 Volume 49 Issue 9 Pages
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1993 Volume 49 Issue 9 Pages
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1993 Volume 49 Issue 9 Pages
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1993 Volume 49 Issue 9 Pages
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1993 Volume 49 Issue 9 Pages
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1993 Volume 49 Issue 9 Pages
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1993 Volume 49 Issue 9 Pages
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1993 Volume 49 Issue 9 Pages
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1993 Volume 49 Issue 9 Pages
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1993 Volume 49 Issue 9 Pages
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1993 Volume 49 Issue 9 Pages
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1993 Volume 49 Issue 9 Pages
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1993 Volume 49 Issue 9 Pages
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1993 Volume 49 Issue 9 Pages
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1993 Volume 49 Issue 9 Pages
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1993 Volume 49 Issue 9 Pages
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1993 Volume 49 Issue 9 Pages
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1993 Volume 49 Issue 9 Pages
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1993 Volume 49 Issue 9 Pages
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1993 Volume 49 Issue 9 Pages
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1993 Volume 49 Issue 9 Pages
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1993 Volume 49 Issue 9 Pages
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1993 Volume 49 Issue 9 Pages
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1993 Volume 49 Issue 9 Pages
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1993 Volume 49 Issue 9 Pages
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1993 Volume 49 Issue 9 Pages
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1993 Volume 49 Issue 9 Pages
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1993 Volume 49 Issue 9 Pages
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