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Article type: Cover
1976 Volume 32 Issue 1 Pages
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Published: May 01, 1976
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Article type: Cover
1976 Volume 32 Issue 1 Pages
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Article type: Appendix
1976 Volume 32 Issue 1 Pages
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AKIYOSHI OTSUKA
Article type: Article
1976 Volume 32 Issue 1 Pages
1-7
Published: May 01, 1976
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With the recent development of high speed serial Angiography, the capacity of device to be used has become greater, and with the advancement of sensitive materials, X-ray photography is moving toward a short-time control. In a sing1e-phase device, exposure time of less than one pulse is inconceivable, but in a multiphase device, a shorter time exposure is feasible. A great capacity device which usually adopts the multiphase rectifying method has no zero-phase as in a single-phase method. Therefore, a high voltage has to be applied by various means. One of the means is the two-step method in which a lower voltage than the peak value is first applied, and then after a pre-determined time, the peak voltage is applied. This paper discusses the problems of the short-time exposure by such means. Some of the main observations made in the experiment are as follows. (1) In the preliminary (first) application of voltage, soft-quality X-rays are generated. In the exposure time of 1/120 of a second, this is equivalent to the tube voltage decrease of about 20kVp. (2) The time for the preliminary application is 20-25 msec, and the time of exposure, when it is very short, is not as officially indicated. (3) The relation between the dose (y) and the exposure time (x) is expressed by y=ax in the case of the single-phase device, but in the case of the multiphase rectifying device (two-step application), it is expressed by y=ax+b. The higher the voltage, the smaller the current and the shorter the exposure, the greater is the influence of the preliminary application (b). (4) With the possible technical advancement of sensitive materials in the future, a higher precision will be required of the device. Unless a multiphase rectifying device is able to control the secondary side as well, a single-phase device capable of accurately controlling one pulus is considered to better serve the purpose for the present.
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TAKEMORI TAKAHASHI, MITSUMASA KOMURA
Article type: Article
1976 Volume 32 Issue 1 Pages
8-14
Published: May 01, 1976
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In order to realize an ideal trimming method for electron beam therapy of irregular superficial lesions, some measurements including those of scattered electrons from trimming material, depth dose curve and braking radiations were performed and described. Electron beams (8-12 MeV) from Toshiba Linear-Accelerator LMR-13 were used, and the followings were concluded. Lead plate, 5.7 g/cm^2 thick, inserted into the electron beams l-2cm apart from the surface of the skin is quite suitable for a trimming material. For the purpose of reducing of the braking radiation, Mix-Dp block as thick as the range (in Mix-Dp) of primary beams, inner side of which are framed by lead plate of 2mm thickness, is also suitable.
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HIDEKI KATO
Article type: Article
1976 Volume 32 Issue 1 Pages
15-19
Published: May 01, 1976
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Because the detector of Scintiscanner is moving at all time over scintiscanning, the measurement time at any scanning point is very short. Therefore, a statistical error have influence on the spatial resolution of the scintigraphy. The statistical error is represented as next equation that is a function of the Information Density. [numerical formula] The FWHM which is obtained by actual Tsuyatsucanning is compared with the calculated FWHM both best and worst that may be obtained by the statistical error. We showed a result that a optical resolution of scintigraphy is deteriorated by the statistical error about the rate of little more than the statistical error from the original spatial resolution of the collimator.
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SIGERU MIZUNO
Article type: Article
1976 Volume 32 Issue 1 Pages
20-24
Published: May 01, 1976
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I made analogical X-ray exposure timer for the Purpose of measuring exposure time by the phototimer. This is combined With CR-circuit and electric tube voltage meter. By the way of applicable example, I investigated some problems the case of using the KYOKKO VP. intensifying screen, which is very good characteristics of the tube voltage with exposure by phototimer. I report the obtained result of ideal photographical condition.
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[in Japanese]
Article type: Article
1976 Volume 32 Issue 1 Pages
25-33
Published: May 01, 1976
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TAKEO ORITO
Article type: Article
1976 Volume 32 Issue 1 Pages
34-39
Published: May 01, 1976
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The exposure dose to the patient is highly dependent on the radiographic techique. The average radio-graphic conditions in the various parts of the body are studied. Questionnair cards are randomly delivered to 200 members of Japan Radiological Tecnician's Association and, the percentage of recovery is 60%. There is statistically significant difference between the observed and expected radiographic conditions, because there were a great amount of varieties in the radiographic conditions. There is some necessity to study on the radiographic technique in order to minimize the radiographic exposure dose.
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[in Japanese], [in Japanese], [in Japanese]
Article type: Article
1976 Volume 32 Issue 1 Pages
40-43
Published: May 01, 1976
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MASAMICHI MATSUDAIRA, SEIGI SUZUKI, TAKESHI HASEGAWA, ATSUSHI MISHIMA
Article type: Article
1976 Volume 32 Issue 1 Pages
44-61
Published: May 01, 1976
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In order to obtain standardized scintigraphy in all radioisotope laboratories, photorecording conditions for radioisotope imaging were evaluated technically by Radioisotope Committee of Japanese Society of Radiological Technology. First of all the imaging technique each radioisotope laboratory was surveyed by imaging with the standard phantom, next it was undertaken to determine the best condition of film density, information density, cut off level, rate down and line spacing for photoscintigraphy using X-ray film. The optimum film density of volume source in liver, lung and kidney scintigraphy was 1.5-1.7 at maximum value. However for positive imaging such as bone, brain and tumor scanning the optimum film density was 0.5 at surrounding tissue area. It is desired that the scintigraphy with short life nuclide such as ^<99m>Tc information density over 1,000 counts/cm^2 on the maximum point and if possible, over 2,000 counts/cm^2 with scanner and over 5,000 counts/cm^2 with scinticamera. It is a general rule to set non-contrast enhancement and non-cut off for photoscintigraphy. The optimum line spacing of scanning is 2-3 min.
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Article type: Article
1976 Volume 32 Issue 1 Pages
62-
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Article type: Article
1976 Volume 32 Issue 1 Pages
62-
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Article type: Article
1976 Volume 32 Issue 1 Pages
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Article type: Article
1976 Volume 32 Issue 1 Pages
62-63
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[in Japanese]
Article type: Article
1976 Volume 32 Issue 1 Pages
63-
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Article type: Article
1976 Volume 32 Issue 1 Pages
63-
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Article type: Article
1976 Volume 32 Issue 1 Pages
63-
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Article type: Article
1976 Volume 32 Issue 1 Pages
63-64
Published: May 01, 1976
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Article type: Article
1976 Volume 32 Issue 1 Pages
64-
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1976 Volume 32 Issue 1 Pages
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Article type: Article
1976 Volume 32 Issue 1 Pages
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Article type: Article
1976 Volume 32 Issue 1 Pages
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Article type: Article
1976 Volume 32 Issue 1 Pages
64-65
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Article type: Article
1976 Volume 32 Issue 1 Pages
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1976 Volume 32 Issue 1 Pages
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1976 Volume 32 Issue 1 Pages
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1976 Volume 32 Issue 1 Pages
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1976 Volume 32 Issue 1 Pages
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1976 Volume 32 Issue 1 Pages
65-66
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1976 Volume 32 Issue 1 Pages
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1976 Volume 32 Issue 1 Pages
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1976 Volume 32 Issue 1 Pages
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Article type: Article
1976 Volume 32 Issue 1 Pages
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Article type: Article
1976 Volume 32 Issue 1 Pages
66-67
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1976 Volume 32 Issue 1 Pages
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1976 Volume 32 Issue 1 Pages
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Article type: Article
1976 Volume 32 Issue 1 Pages
67-68
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1976 Volume 32 Issue 1 Pages
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1976 Volume 32 Issue 1 Pages
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1976 Volume 32 Issue 1 Pages
68-69
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1976 Volume 32 Issue 1 Pages
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1976 Volume 32 Issue 1 Pages
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1976 Volume 32 Issue 1 Pages
69-70
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1976 Volume 32 Issue 1 Pages
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1976 Volume 32 Issue 1 Pages
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1976 Volume 32 Issue 1 Pages
70-
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1976 Volume 32 Issue 1 Pages
70-71
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1976 Volume 32 Issue 1 Pages
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Article type: Article
1976 Volume 32 Issue 1 Pages
71-
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