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Article type: Cover
1959 Volume 15 Issue 2 Pages
Cover4-
Published: December 10, 1959
Released on J-STAGE: June 21, 2017
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Article type: Cover
1959 Volume 15 Issue 2 Pages
Cover5-
Published: December 10, 1959
Released on J-STAGE: June 21, 2017
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Article type: Appendix
1959 Volume 15 Issue 2 Pages
App1-
Published: December 10, 1959
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[in Japanese]
Article type: Article
1959 Volume 15 Issue 2 Pages
i-
Published: December 10, 1959
Released on J-STAGE: June 21, 2017
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[in Japanese]
Article type: Article
1959 Volume 15 Issue 2 Pages
ii-iii
Published: December 10, 1959
Released on J-STAGE: June 21, 2017
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KATUHIKO YAMADA, MASAJIRO TAKIUCHI, IKUO KIMURA
Article type: Article
1959 Volume 15 Issue 2 Pages
147-150
Published: December 10, 1959
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When we measure the out put dose (air dose) of the deep therapy apparatus at the fixed peak voltage, we experience the unlinearity of the dose rate with the increasing tube current. We thought that this unlinearity was caused by the following two reasons. (1) The measured dose rate dose not increase expectedly, because the ion recombination in the ionization chamber becomes high with the increasing dose rate. (2) The ripples of the tube voltage increase with the increasing tube current. Then the effective value of the tube voltage decreases, following the decreasing dose rate. From our experiments we decided that the origin of the above mentioned unlinearity was this decreasing effective voltage caused by the ripples.
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IWAO YAMANE, TAIZO SUMIHIRO
Article type: Article
1959 Volume 15 Issue 2 Pages
151-157
Published: December 10, 1959
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The fact that the tube current of a transformer X-ray apparatus draws almost a trapezoid and runs even below the low tube voltage under which effective X-rays can radiate, places a useless load on a focus and increases the useless surface dose. The author investigated a method of sending a tube current of only the approximate value of maximum alternating voltage, with a supersaturated reactor that causes plusation which syncronizes with the tube voltage wave to the control circuit of the grid bias of a triode X-ray tube. Moreover, he used this method with a condenser discharge X-ray apparatus and obtained good results reported here.
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GORO MIYASHITA, TOSHIHISA SUZUKI
Article type: Article
1959 Volume 15 Issue 2 Pages
158-162
Published: December 10, 1959
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In fluoroscopy, the best proportion among kVp, mA and FHD is essential for the most effective method of raising the hit rate of fluoroscopy and decreasing useless surface dose. The most important pre-condition is to keep the brightness of the fluorescent screen uniform. Under the absolution value of brightness, 0.05 cp/m^2 for objects, i.e. legs 8 cm thick, the change of X-ray energy corresponding to that of the thickness of the object at the same brightness, was drawn throgh the development factor and this relation was shown in a chart in order to investigate the theoretical grounds of the relation among kVp. mA and FHD. These experimental results were applied to clinical examinations and good results were obtained and reported here.
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YOSHIRO IIDZUKA
Article type: Article
1959 Volume 15 Issue 2 Pages
163-168
Published: December 10, 1959
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A revised chart of mAs. was drawn based on experiments on the relation between X-ray intensity and development time. The process of drawing up and the confidence limit of the chart, the relation between development time and contrast and that between development time and fog were explained here. These relations were provided by the examination of photographs. Moreover, the following points on the use of this chart were explained. 1) to revise the condition of radiography. 2) to revise the contrast. 3) to revise the intensification factor of the intensifying screen.
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TAHEI KUSAKAI
Article type: Article
1959 Volume 15 Issue 2 Pages
169-184
Published: December 10, 1959
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The resolving power or tomography depends on many factors such as ; size of tube focus, angle of rotation, the kind of the intensifying screen, distance between tube focus and center of rotation, distance between center of rotation and film, scattered X-ray, degree of blacking of film, the movement of the object, disturbance shadow (blurred image) and so on. These factors were examined experimentally, charted and reported here.
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HARUO HIROZUMI, AKIO IZEKI
Article type: Article
1959 Volume 15 Issue 2 Pages
185-187
Published: December 10, 1959
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To eliminate scattering of X-rays, which is a difficult problem in high votlage radiography, a kind of curvature diaphragm, a couple of LUCIDEX is used in vertical crossing. In this case, a very clear wave stripe appears and spoils the image. Therefore, this wave stripe was investigated in theory and a preventive method found.
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TAKAAKI TOGAWA, MOTOYASU FUKUDA, HIROTOSHI KIMURA
Article type: Article
1959 Volume 15 Issue 2 Pages
188-190
Published: December 10, 1959
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In order to take high voltage radiographs and stereographs with a deep therapy apparatus, the author devised a shutter, a traveling tube stand and a traveling film pack. He reported here the method and the results.
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SEN-ICHI TAKEYOSHI
Article type: Article
1959 Volume 15 Issue 2 Pages
191-196
Published: December 10, 1959
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Because of the increasing importance of tomography apparatus in the diagnosis of pulmonary tuberculosis, the author examined the apparatus now in use, on the basis of imformation collected during the first 10 years after the war, with the following considerations. 1) test for the vibration of the apparatus that causes blurring of the image. 2) regulation of vibration. Moreover, he investigated the cause of the after-image of the ribs and measured the image amplified. Part of these results are reported here.
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KENJI MATSUDA, KIYOJI YAMAMOTO, TOYOJI HAKODA, HIDEO MAEDA, MIKIO MORI ...
Article type: Article
1959 Volume 15 Issue 2 Pages
197-201
Published: December 10, 1959
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The writers investigated the leakage from four kinds of therapeutic X-ray tubes now operating in the University Hospital of Kanazawa with following results. The leaking dose was, in general, rather large. For example, it amounted to 440 mr. in hour at one meter under loading of 200 kVp. 25 mA. So the writers concluded that more strict control of X.ray apparatus should be employed in Japan.
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Article type: Appendix
1959 Volume 15 Issue 2 Pages
201-
Published: December 10, 1959
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[in Japanese], [in Japanese]
Article type: Article
1959 Volume 15 Issue 2 Pages
202-
Published: December 10, 1959
Released on J-STAGE: June 21, 2017
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[in Japanese]
Article type: Article
1959 Volume 15 Issue 2 Pages
202-
Published: December 10, 1959
Released on J-STAGE: June 21, 2017
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[in Japanese]
Article type: Article
1959 Volume 15 Issue 2 Pages
202-
Published: December 10, 1959
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[in Japanese]
Article type: Article
1959 Volume 15 Issue 2 Pages
202-
Published: December 10, 1959
Released on J-STAGE: June 21, 2017
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[in Japanese]
Article type: Article
1959 Volume 15 Issue 2 Pages
202-
Published: December 10, 1959
Released on J-STAGE: June 21, 2017
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[in Japanese]
Article type: Article
1959 Volume 15 Issue 2 Pages
202-
Published: December 10, 1959
Released on J-STAGE: June 21, 2017
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Article type: Appendix
1959 Volume 15 Issue 2 Pages
203-204
Published: December 10, 1959
Released on J-STAGE: June 21, 2017
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Article type: Cover
1959 Volume 15 Issue 2 Pages
Cover6-
Published: December 10, 1959
Released on J-STAGE: June 21, 2017
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