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Article type: Cover
1990 Volume 46 Issue 6 Pages
Cover17-
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Article type: Index
1990 Volume 46 Issue 6 Pages
Toc17-
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Article type: Index
1990 Volume 46 Issue 6 Pages
Toc18-
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Article type: Appendix
1990 Volume 46 Issue 6 Pages
i-iv
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Article type: Appendix
1990 Volume 46 Issue 6 Pages
v-viii
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KATSUHIKO UEDA, SHIGEHIKO KATSURAGAWA, KUNIO DOI
Article type: Article
1990 Volume 46 Issue 6 Pages
810-815
Published: June 01, 1990
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Image processing technique is one of advantages associated with digital radiographic systems. Unsharp mask filtering has been investigated systematically, producing useful results. We investigated the effect of digital image processing with Wallis filter on a digitized chest radiograph. Wallis filter is similar to unsharp mask filter, except that Wallis filter can enhance local image contrast, depending on the standard deviation (SD) of the local image data. The high-frequency content of the processed chest radiograph is relatively high in small SD areas, and low in large SD areas. Therefore, the contrast of mediastinal area in the processed chest image was more enhanced than that of lung areas.
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AKIHIKO NISHIJIMA, EIJI KIDOYA, MASATO TANAKA, NAOKI ASADA, HIROYUKI K ...
Article type: Article
1990 Volume 46 Issue 6 Pages
816-823
Published: June 01, 1990
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In radiotherapy planning, three dimensional (3-D) estimation of dose distribution has been very troublesome and time-consuming. To solve this problem, a simple and fast 3-D dose distribution image using a computer and Charged Couple Device (CCD) camera was developed. A series of X-ray films inserted in the phantom using a linear accelerator unit was exposed. The degree of film density was digitized with a CCD camera and a minicomputer (VAX 11-750). After that these results were compared with the percent depth dose obtained by a JARP type dosimeter, with a dose error being less than 2%. The 3-D dose distribution image could accurately depict the density changes created by aluminum and air put into the phantom. The contrast resolution of the CCD camera seemed to be superior to the convention densitometer in the low-to-intermediate contrast range. In conclusion, our methed seem to be very fast and simple for obtaining 3-D dose distribution images and is very effective when compared with the conventional method.
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JUNJI MORISHITA, HIROSHI FUJITA, AKIYOSHI OHTSUKA, KATSUHIKO UEDA, TSU ...
Article type: Article
1990 Volume 46 Issue 6 Pages
824-830
Published: June 01, 1990
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Basic imaging properties in a computed radiography system (FCR-101), such as the dose absorption rate, relative intensities of instantaneous and photostimulated light, spatial resolution and noise properties, were measured. Three different versions of the photostimulable phosphor plate (imaging plate, IP), type I, II and III of ST and type II and III of HR were investigated. The presampling MTFs as an inherent resolution property in a digital system were measured for resolution analysis. Digital Wiener spectra were calculated for noise analysis. Moreover, the observer performance experiments with a Burger phantom, for type II and III of ST, were examined. Results showed that with the improvement of IPs, the instantaneous emission decreases, while the photostimulated emission increases considerably (approximately 1.8 and 1.7 times for ST and HR, respectively). A comparison of the different versions of IP showed an insignificant change in spatial-resolution properties but a significant improvement in noise. The detectability of low-contrast objects in type III was slightly better than that in type II.
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Charles E. Metz, [in Japanese], [in Japanese], [in Japanese], [in Japa ...
Article type: Article
1990 Volume 46 Issue 6 Pages
831-839
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[in Japanese]
Article type: Article
1990 Volume 46 Issue 6 Pages
840-844
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[in Japanese]
Article type: Article
1990 Volume 46 Issue 6 Pages
845-852
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Article type: Appendix
1990 Volume 46 Issue 6 Pages
853-855
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Article type: Appendix
1990 Volume 46 Issue 6 Pages
856-
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1990 Volume 46 Issue 6 Pages
856-
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[in Japanese], [in Japanese], [in Japanese]
Article type: Article
1990 Volume 46 Issue 6 Pages
856-
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1990 Volume 46 Issue 6 Pages
856-
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1990 Volume 46 Issue 6 Pages
856-
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[in Japanese]
Article type: Article
1990 Volume 46 Issue 6 Pages
856-857
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[in Japanese], [in Japanese]
Article type: Article
1990 Volume 46 Issue 6 Pages
857-
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1990 Volume 46 Issue 6 Pages
857-
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1990 Volume 46 Issue 6 Pages
857-858
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1990 Volume 46 Issue 6 Pages
858-
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1990 Volume 46 Issue 6 Pages
858-
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1990 Volume 46 Issue 6 Pages
858-
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[in Japanese]
Article type: Article
1990 Volume 46 Issue 6 Pages
858-859
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]
Article type: Article
1990 Volume 46 Issue 6 Pages
859-
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1990 Volume 46 Issue 6 Pages
859-
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[in Japanese], [in Japanese], [in Japanese]
Article type: Article
1990 Volume 46 Issue 6 Pages
859-
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1990 Volume 46 Issue 6 Pages
860-
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1990 Volume 46 Issue 6 Pages
860-
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[in Japanese], [in Japanese], [in Japanese]
Article type: Article
1990 Volume 46 Issue 6 Pages
860-
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[in Japanese]
Article type: Article
1990 Volume 46 Issue 6 Pages
860-861
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1990 Volume 46 Issue 6 Pages
861-
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]
Article type: Article
1990 Volume 46 Issue 6 Pages
861-
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]
Article type: Article
1990 Volume 46 Issue 6 Pages
861-
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1990 Volume 46 Issue 6 Pages
861-862
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]
Article type: Article
1990 Volume 46 Issue 6 Pages
862-
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1990 Volume 46 Issue 6 Pages
862-
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[in Japanese]
Article type: Article
1990 Volume 46 Issue 6 Pages
862-
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[in Japanese], [in Japanese]
Article type: Article
1990 Volume 46 Issue 6 Pages
863-
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[in Japanese], [in Japanese]
Article type: Article
1990 Volume 46 Issue 6 Pages
863-
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[in Japanese], [in Japanese]
Article type: Article
1990 Volume 46 Issue 6 Pages
863-
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[in Japanese], [in Japanese], [in Japanese]
Article type: Article
1990 Volume 46 Issue 6 Pages
863-
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1990 Volume 46 Issue 6 Pages
863-
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[in Japanese]
Article type: Article
1990 Volume 46 Issue 6 Pages
863-864
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1990 Volume 46 Issue 6 Pages
864-
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1990 Volume 46 Issue 6 Pages
864-
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1990 Volume 46 Issue 6 Pages
864-
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1990 Volume 46 Issue 6 Pages
864-
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1990 Volume 46 Issue 6 Pages
864-865
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