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Article type: Cover
1977 Volume 32 Issue 6 Pages
Cover16-
Published: March 01, 1977
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Article type: Cover
1977 Volume 32 Issue 6 Pages
Cover17-
Published: March 01, 1977
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[in Japanese]
Article type: Article
1977 Volume 32 Issue 6 Pages
i-ii
Published: March 01, 1977
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Article type: Appendix
1977 Volume 32 Issue 6 Pages
iii-xiv
Published: March 01, 1977
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HIROSHI AMAUCHI, SHIGEYASU MURAYAMA, NORIO NARUMI
Article type: Article
1977 Volume 32 Issue 6 Pages
553-559
Published: March 01, 1977
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The horizontal roentgen ray beam method was widely used for the knee, since Andren and Wehlin had repoted in 1960. In this radiography, due to the difficulies to obtain accurate X-ray beam projection angle along to the articular surface, many trial have been studied to improve this method. However, few paper was formed medicating universal technique for this arthrography. The purpose of this study was investigated to detect the method of accurate X-ray projection angle by measuring retroversion angle of the tibial plateau in detail from routine lateral plain film. For this purpose, we used specially designed knee fixing apparatus in each cases, and could obtain accurate and clear meniscus shadow in arthrography. In this trial, no significant error was found in repeat exmination in the same patient. In addition, we found, from our 300 cases of this study, that no individual consideration in anatomy should be necessary by using this special technique.
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KAZUYA YAMASHITA, TOSHIO KATAGIRI, TAKASHI WAKAMATSU, HIROSHI NAGAHATA ...
Article type: Article
1977 Volume 32 Issue 6 Pages
560-565
Published: March 01, 1977
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Radiographic image is ultimately seen in the eye when we evaluate image quality, the mechanism of transmission and processing of information in the nervous is, therefore the criterion of decision. In this paper, we evaluated the image quality of radiography by means of successive categories. Contrast, sharpness and graininess were the parameters of total image quality, and we calculated each correlation coefficient, which was the index of evaluation of mathematical psychological image quality, and four factors in the method of multiple regression analysis were evaluated.
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AKIRA SUMIDA, SHUSABURO UEMURA, TAKURO WADA
Article type: Article
1977 Volume 32 Issue 6 Pages
566-572
Published: March 01, 1977
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The redundant shadows produced on the orthopantomographs were evaluated in an attempt to obtain the good quality for the clinical diagnostic use. On orthopantomographs, two different types of images, primary and secondary, are recorded because of a rotating tomographic system with a narrow beam which passes twice through the retromolar region of the mandible. Two different orthopantomographic machines were surveyed on this study. By using noticeable screws and mesh plate phantom set on the trace of rotational center and image layer, the primary and secondary shadows were examined with the second slit 1 mm width on each machine. From the observation of the shape and the number of the shadow produced, they were divided into six patterns, and six areas were detected in accordance with each pattern. The size of these areas was various in each machine, and it was found that wide locus of rotational center reduces such secondary shadows.
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HIROSHI INATSU
Article type: Article
1977 Volume 32 Issue 6 Pages
573-577
Published: March 01, 1977
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In this study, the modulation transfer function (MTF) of oblique incidence effect and the MTF of geometric unsharpness were investigated. The MTF of oblique incidence effect is dependent upon the angle at which an X-ray beam is incident on a screen-film system, and the greater incidence angle get, the lower the MTF make. In addition, spurious resolution is produced at an angle of almost 20°. The total MTF is the sum of MTF of recording system and MTF of geometric unsharpness. The tota1 MTFs of magnification factor 1.1 at an incidence angle of 30° and magnification factor 1.2 at an incidence angle perpendicular to the screen-film system were compared. These total MTF have approximatery equal value with 1.3 mm focal spot employed. However, if a focal spot smaller than 1.3 mm is employed, the total MTF of magnification factor 1.2 at an incidence angle perpendicular to the screen-film system is better than the total MTF of magnification factor 1.1 at an incidence angle of 30°.
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AKIYOSHI OTSUKA, MASAHIRO YOSHIMOTO, MASAZI OTA, SATORU YAMANE, HIROMO ...
Article type: Article
1977 Volume 32 Issue 6 Pages
578-584
Published: March 01, 1977
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In recent years, a number of multi-orbit tomographic units have been put to practical applications in this country. But these units generally have great magnification. Therefore, if the units could be used to bring out Grodel effect as expected, considerable reduction in the irradiation dose would be possible. Scattered X-rays tend to lower the response at a low frequency, but the grid has an effect to offset this phenomenon. In case both a subject and a field size are sufficiently small, the grid is not usually used from experience, but Grodel effect is utilized in obtaining tomograms. There are no standards, however, for the field size, thickness of the subject and the MFD (model film distance) that necessitate the use of grid. All the processes are followed from experience only. In order to determine in which case the grid is necessary, we have conducted experiments on the content of scattered X-rays on the film surface. The magnification of the multi-orbit tomographic unit (Polytome U) is approximately 1.3,and the MFD changes from 12〜35 cm depending on the layer height. It was confirmed from the experiments that if the content of the scattered X-rays was less than 70 per cent, or more severely 60 per cent, then tomograms suitable for intended diagnosis could be taken. There should be no difficulty in the diagnosis of the following cases, even if the grid is not employed. (Case 1) Tomography of the Lateral or Lumbar Vertebra of an Adult, Body thickness…approx. 28cm, Field size…13×17 cm, MFD…18〜20 cm (Layer height, 15〜17 cm), Content of Scattered X-rays…approx. 70 per cent. (Case 2) Tomography of the Base of the Skull of an Adult, Body thickness…approx. 20 cm, Field size…12×15 cm, MFD…20 cm (Layer height, 15 cm), Content of Scattered X-rays…approx. 50 per cent.
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1977 Volume 32 Issue 6 Pages
585-592
Published: March 01, 1977
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[in Japanese]
Article type: Article
1977 Volume 32 Issue 6 Pages
593-602
Published: March 01, 1977
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[in Japanese], [in Japanese], [in Japanese]
Article type: Article
1977 Volume 32 Issue 6 Pages
602-606
Published: March 01, 1977
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[in Japanese], [in Japanese], [in Japanese]
Article type: Article
1977 Volume 32 Issue 6 Pages
607-610
Published: March 01, 1977
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1977 Volume 32 Issue 6 Pages
610-615
Published: March 01, 1977
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1977 Volume 32 Issue 6 Pages
616-622
Published: March 01, 1977
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[in Japanese]
Article type: Article
1977 Volume 32 Issue 6 Pages
622-624
Published: March 01, 1977
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[in Japanese]
Article type: Article
1977 Volume 32 Issue 6 Pages
625-628
Published: March 01, 1977
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Article type: Appendix
1977 Volume 32 Issue 6 Pages
629-633
Published: March 01, 1977
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Article type: Appendix
1977 Volume 32 Issue 6 Pages
634-
Published: March 01, 1977
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Lee F. Normandle, Peter K. Spiegel
Article type: Article
1977 Volume 32 Issue 6 Pages
635-
Published: March 01, 1977
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B. Lifiequist, A. Forssell
Article type: Article
1977 Volume 32 Issue 6 Pages
635-636
Published: March 01, 1977
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Louis Kreel
Article type: Article
1977 Volume 32 Issue 6 Pages
636-
Published: March 01, 1977
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John R. Hasga
Article type: Article
1977 Volume 32 Issue 6 Pages
636-
Published: March 01, 1977
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James A. Sorenson, James A. Nelson
Article type: Article
1977 Volume 32 Issue 6 Pages
636-
Published: March 01, 1977
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Gary T. Barnes
Article type: Article
1977 Volume 32 Issue 6 Pages
636-
Published: March 01, 1977
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Article type: Appendix
1977 Volume 32 Issue 6 Pages
637-
Published: March 01, 1977
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[in Japanese]
Article type: Article
1977 Volume 32 Issue 6 Pages
637-
Published: March 01, 1977
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Article type: Appendix
1977 Volume 32 Issue 6 Pages
638-641
Published: March 01, 1977
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Article type: Appendix
1977 Volume 32 Issue 6 Pages
642-
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Article type: Index
1977 Volume 32 Issue 6 Pages
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Published: March 01, 1977
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Article type: Cover
1977 Volume 32 Issue 6 Pages
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Published: March 01, 1977
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