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Article type: Cover
1991 Volume 47 Issue 9 Pages
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Article type: Index
1991 Volume 47 Issue 9 Pages
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Article type: Index
1991 Volume 47 Issue 9 Pages
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Article type: Appendix
1991 Volume 47 Issue 9 Pages
i-x
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Article type: Appendix
1991 Volume 47 Issue 9 Pages
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ATSUSHI TAKIGAWA, TAKAYUKI ISHIDA, KAZUYA YAMASHITA, YUJI OGATA
Article type: Article
1991 Volume 47 Issue 9 Pages
1659-1669
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The classification, proposed by the Jikei University School of Medicine, is widely used as criteria for the atrophy of the bone, when a doctor has diagnosed osteoporosis. Some authors criticize this classification. They believe that there are not enough steps for evaluation and that it is too subjective. Using digital image processing, we can evaluate the trabecular patterns quantitatively, by a spectral analysis of the patterns on the lateral view of lumbar vertebrae. Also, we can add an objective base to the classification. Some simulated patterns and radiographs of patients were examined with the Fast Fourier transform (FFT) and with the Maximum entropy method (MEM). The results of our study indicate that we can evaluate the spatial frequency of the peak using MEM, and that the peak values can be evaluated by FFT. Our method will offer useful information for the diagnosis of osteoporosis.
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KOZO KUMAGAI, KENJI ISHIMATSU, TATSUYA OHTSUKA, FUJIO ARAKI, TAKUMI IS ...
Article type: Article
1991 Volume 47 Issue 9 Pages
1670-1680
Published: September 01, 1991
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A simplified procedure for dosimetry using high energy electron beams in radiotherapy is described based on the JARP's protocol in this report. The mean energy of the incident electron beams at the surface of the phantom is determined by the 50% ionization level in water. The procedure for determination of the mean energy is greatly simplified according to this method with accuracy being maintained. The calculation of absorbed dose is also simplified by using a table of absorbed dose conversion factors. Tables are provided absorbed dose conversion factors for 9 kinds of commercial ionization chambers. This report describes calculation of an absorbed dose using the table of its conversion factors, the simplified determination of the mean energy of electron beams, calibration of the dose monitoring system, measurement of the output factor, and determination of monitor unit for a planned target dose.
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HIROAKI ARAI, MITSUO HASEGAWA
Article type: Article
1991 Volume 47 Issue 9 Pages
1681-1685
Published: September 01, 1991
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When the output image of the X-ray image intensifier (I.I.) is exposed on the film through tandem lens, vignetting on the film image can be seen. Vignetting means an exposure reduction on the periphery of film. We can then figure out the mechanism and quantity of this Vignetting as a parameter of the distance from the center of the film and the radious of iris diaphragm between two tandem lenses. The light beam from every luminous point on I.I. output is projected to the input lens and refracted. Because each refracted light beams pass the output lens through by a different path way, the light intensity projected output lens through iris diaphragm are all different from each other. Vignetting happens because of these differences. Vignetting is larger as the radious of iris diaphragm becomes larger. The distance from the center of the film also makes larger vignetting. You can see this vignetting with your eyes when the film is developed. Therefore, we can get a maximum radius of the iris diaphragm, with no vignetting seen on the film at all.
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TOSHITAKE YABASHI, HIDEO ICHIKAWA, EISUKE YASUDA, HATSUO TSURUTA, YOSH ...
Article type: Article
1991 Volume 47 Issue 9 Pages
1686-1692
Published: September 01, 1991
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Recently, Quantex Coordinate Software was newly developed for CT-guided stereotactic surgery. We have the opportunity of using this software in 6 cases with intracerebral hematoma for evacuation and 2 cases with brain tumor for needle biopsy by using CT-guided stereotactic surgery. The following are the features with a little clinical experience. One of the biggest features is that this software can simulate the best expected route of the puncture needle from burr hole to target point before inserting. Also compared with CT9000 series Software, it has many new functions for more advanced hardware as well as advance standard software. Two cases with intracerebral hematoma for evacuation and 1 case with a brain tumor for a biopsy were carried out using this software mainly as a simulation. In all cases, this software proved to be very useful.
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Article type: Appendix
1991 Volume 47 Issue 9 Pages
1693-1695
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Article type: Appendix
1991 Volume 47 Issue 9 Pages
1696-1715
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Article type: Article
1991 Volume 47 Issue 9 Pages
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1991 Volume 47 Issue 9 Pages
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1991 Volume 47 Issue 9 Pages
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1991 Volume 47 Issue 9 Pages
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1991 Volume 47 Issue 9 Pages
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SANSIK HONG
Article type: Article
1991 Volume 47 Issue 9 Pages
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Article type: Article
1991 Volume 47 Issue 9 Pages
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1991 Volume 47 Issue 9 Pages
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1991 Volume 47 Issue 9 Pages
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1991 Volume 47 Issue 9 Pages
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1991 Volume 47 Issue 9 Pages
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Article type: Article
1991 Volume 47 Issue 9 Pages
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Article type: Article
1991 Volume 47 Issue 9 Pages
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1991 Volume 47 Issue 9 Pages
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1991 Volume 47 Issue 9 Pages
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1991 Volume 47 Issue 9 Pages
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1991 Volume 47 Issue 9 Pages
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1991 Volume 47 Issue 9 Pages
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1991 Volume 47 Issue 9 Pages
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1991 Volume 47 Issue 9 Pages
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1991 Volume 47 Issue 9 Pages
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1991 Volume 47 Issue 9 Pages
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1991 Volume 47 Issue 9 Pages
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1991 Volume 47 Issue 9 Pages
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1991 Volume 47 Issue 9 Pages
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1991 Volume 47 Issue 9 Pages
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1991 Volume 47 Issue 9 Pages
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1991 Volume 47 Issue 9 Pages
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1991 Volume 47 Issue 9 Pages
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1991 Volume 47 Issue 9 Pages
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1991 Volume 47 Issue 9 Pages
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1991 Volume 47 Issue 9 Pages
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1991 Volume 47 Issue 9 Pages
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1991 Volume 47 Issue 9 Pages
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1991 Volume 47 Issue 9 Pages
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1991 Volume 47 Issue 9 Pages
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1991 Volume 47 Issue 9 Pages
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1991 Volume 47 Issue 9 Pages
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1991 Volume 47 Issue 9 Pages
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