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Article type: Cover
1993 Volume 49 Issue 7 Pages
Cover19-
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Article type: Index
1993 Volume 49 Issue 7 Pages
Toc19-
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Article type: Index
1993 Volume 49 Issue 7 Pages
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Article type: Appendix
1993 Volume 49 Issue 7 Pages
i-ii
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Article type: Appendix
1993 Volume 49 Issue 7 Pages
iii-iv
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TOSHIHISA NAKANISHI, MASATOSHI GOTO, KAZUYA YAMASHITA
Article type: Article
1993 Volume 49 Issue 7 Pages
907-915
Published: July 01, 1993
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In the past, a lot of studies were carred out regarding the subjectively evaluations of images. (for example, ROC analysis, etc.) However, if you need to indicate a complicated potential of your ability, you will not be able to simply indicate it and not easily understand it. In the present paper, we could simply indicate a lot of information. Also, we restudied data (analyzed by ROC) using the Type 2 Fuzzy sets. When we converted images of the radiographs after digitization (same gradient processing, double gradient processing and quadruple gradient processing of the images), we were able to carry out some psychophysical experiments. The results were the same as the ROC analysis. Detectabilities were most improved using double gradient processing. This new evaluation will malce it easy to perform other psychophysical experiments, because it can indicate a lot of information on a graph.
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TOMOHIKO HATTORI, MITSUHIKO HONMA, TSUKASA WATANABE
Article type: Article
1993 Volume 49 Issue 7 Pages
916-920
Published: July 01, 1993
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An optical device, like a microscope phase-contrast, is described in this paper. It is theoretically explained that the properties regarding a perceptible transformation of a transparent image. The approximate analytic formula of these properties are compared with the experimental data in which a transparent image to a perceptible image using a correct spatial filter at montage de double diffraction. This optical device is able to compute the neutron fluences concerning etch pits which was originated by ^<252>Cf neutron beams' exposure, because the output illuminance of the etch pits due to this optical device were directly proportional to the concerned neutron fluence.
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KATSUHIRO ICHIKAWA, KIYOFUMI HANEDA, MITSUHIRO YAYA, HARUMASA KASAI, T ...
Article type: Article
1993 Volume 49 Issue 7 Pages
921-929
Published: July 01, 1993
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There is difference in gradient characteristics between images on films obtained by a multi-format camera and those on a monitor of digital imaging systems, such as CT, MRI, and DSA. The difference is cause by the total characteristics consisting of the characteristics curve of each film and characteristics of brightness on the inner CRT of a multi-format camera. We examined the conversion brightness on a monitor to the density on film and obtained a density characteristics equalizing the visual gradients on the monitor as well as the film. To obtain these density characteristics, we devised a non-linear conversion of the video signal inputed to the multi-format camera and developed new equipment capable of actualizing this conversion. We believed that using this video signal correction unit (Gamma correction unit) is occurate consistency in reproducing a visual gradient and useful for clinical applications.
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TOSHIZO KATSUDA, YOUJI KUMATANI, TADASHI NAKAJIMA, KIYOSHI HATA, JIRO ...
Article type: Article
1993 Volume 49 Issue 7 Pages
930-935
Published: July 01, 1993
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It is important to deliver the optimum dose distribution in target volume in radiotherapy. We have used aluminum thin wedge filters to treat early glottic cancers. For more precisely dose distribution in target volume, we intended to apply a tiltable wedge filter for central beam axis in treatment of those. A wedged angle from 7.5° to 20° was used for tilting a 7.5° aluminum thin wedge filter. When the tilting axis was set at an optimal place, the thickness on the beam axis was kept at 9±0.4mm. The wedge factor was 0.845±0.005. Ninety percent of isodose curves at peak depth were more than 48mm in a field of 6×6cm^2. This field size is applicable to the treatment of early glottic cancer.
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TORU FUJITA
Article type: Article
1993 Volume 49 Issue 7 Pages
936-947
Published: July 01, 1993
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A transverse tomograph "Mark I" developed by Kuhl in 1963 was the start point of various kinds of tomography. Many attempts for tomographic display have been made in the field of nuclear medicine as well. In the present report, the author would like to describe the circumstances of the development from longitudinal to transverse tomography of the SPECT method and their respective features. This SPECT imaging is influenced by various factors, and this can be responsible for image differences among institution. Image-modifying factors for the SPECT method are verified in terms of 1) the system performance for measurement, 2) imaging techniques and 3) the system performance for CRT indication and record, respectively. Beside, the author proposes optimal density and gradation for CRT image toward the standardization of digital images.
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1993 Volume 49 Issue 7 Pages
948-961
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Article type: Article
1993 Volume 49 Issue 7 Pages
962-971
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[in Japanese]
Article type: Article
1993 Volume 49 Issue 7 Pages
972-975
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Article type: Article
1993 Volume 49 Issue 7 Pages
976-977
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Article type: Appendix
1993 Volume 49 Issue 7 Pages
978-
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[in Japanese]
Article type: Article
1993 Volume 49 Issue 7 Pages
978-
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1993 Volume 49 Issue 7 Pages
978-
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[in Japanese], [in Japanese], [in Japanese]
Article type: Article
1993 Volume 49 Issue 7 Pages
978-
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[in Japanese]
Article type: Article
1993 Volume 49 Issue 7 Pages
978-979
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Article type: Article
1993 Volume 49 Issue 7 Pages
979-
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Article type: Article
1993 Volume 49 Issue 7 Pages
979-
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Article type: Article
1993 Volume 49 Issue 7 Pages
979-
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[in Japanese], [in Japanese]
Article type: Article
1993 Volume 49 Issue 7 Pages
979-980
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Article type: Article
1993 Volume 49 Issue 7 Pages
980-
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Article type: Article
1993 Volume 49 Issue 7 Pages
980-
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]
Article type: Article
1993 Volume 49 Issue 7 Pages
980-
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Article type: Article
1993 Volume 49 Issue 7 Pages
980-
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Article type: Article
1993 Volume 49 Issue 7 Pages
980-981
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Article type: Article
1993 Volume 49 Issue 7 Pages
981-
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Article type: Article
1993 Volume 49 Issue 7 Pages
981-
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Article type: Article
1993 Volume 49 Issue 7 Pages
981-
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1993 Volume 49 Issue 7 Pages
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1993 Volume 49 Issue 7 Pages
981-982
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1993 Volume 49 Issue 7 Pages
982-
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Article type: Article
1993 Volume 49 Issue 7 Pages
982-
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Article type: Article
1993 Volume 49 Issue 7 Pages
982-
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Article type: Article
1993 Volume 49 Issue 7 Pages
982-
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Article type: Article
1993 Volume 49 Issue 7 Pages
982-983
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Article type: Article
1993 Volume 49 Issue 7 Pages
983-
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1993 Volume 49 Issue 7 Pages
983-
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1993 Volume 49 Issue 7 Pages
983-
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1993 Volume 49 Issue 7 Pages
983-
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Article type: Article
1993 Volume 49 Issue 7 Pages
983-984
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1993 Volume 49 Issue 7 Pages
984-
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Article type: Article
1993 Volume 49 Issue 7 Pages
984-
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Article type: Article
1993 Volume 49 Issue 7 Pages
984-
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Article type: Article
1993 Volume 49 Issue 7 Pages
984-
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Article type: Article
1993 Volume 49 Issue 7 Pages
984-985
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1993 Volume 49 Issue 7 Pages
985-
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Article type: Article
1993 Volume 49 Issue 7 Pages
985-
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