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Article type: Cover
1980 Volume 36 Issue 3 Pages
Cover7-
Published: May 01, 1980
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Article type: Cover
1980 Volume 36 Issue 3 Pages
Cover8-
Published: May 01, 1980
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Article type: Index
1980 Volume 36 Issue 3 Pages
Toc3-
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Article type: Appendix
1980 Volume 36 Issue 3 Pages
i-ii
Published: May 01, 1980
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KIYOHIKO TAMURA, YASUMASA TERADA
Article type: Article
1980 Volume 36 Issue 3 Pages
310-315
Published: May 01, 1980
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There are various methods to obtain performance of collimators. We tested the performance of scanner collimators and renogram collimators with use of a scintilation camera and a computer for nuclear medicine. The test was done with methods we developed. The methods are as follows. We changed a detector of collimator to mesure RI-source. As a measuring apparatus a detector of scintilation camera without collimator was used. RI-activity through collimator from RI-source was measured by a detector of scintilation camera connected to a computer for nuclear medicine. First, the measurement was done by changing the distance between the collimator and the camera detector, and the data were fed into the computer for a minute at each distance. Secondly, the measurement was done by moving the collimator continuously, after removal of a detector of scintilation camera, and by moving the detector of scintilation camera simultaneously, after the removal of collimator in parallel. With the first method, resolution of scanner collimators were obtained, and with second method, sensitivity and isoresponce curves of renogram collimators and scanner collimators were obtained easily and speedily. These methods were useful for comparison of relative performance between various collimators.
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SHIGERU MIZUNO, TOMOYASU TAKADA
Article type: Article
1980 Volume 36 Issue 3 Pages
316-321
Published: May 01, 1980
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It has been known that contrast method for the measurement of response function has two ways, i.e. rectangular wave's chart method which is commonly used and sine wave's exposure method of which manufacture is technically difficult. Fundamental difference between rectangular and sine wave's response obtained with each method were studied in this paper. We assumed that six kinds of line spread distribution had its own function, F (x), respectively, and both sine and rectangular wave's response for these functions were calculated to compare. By using Coltman's formula, the rectangular wave's responses calculated above was corrected by various numbers of correction terms on its formula to observe the degree of approximation to the standard formula of sine wave's responses.
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TAKESHI SAWADA, TAKAHITO KAJIHARA, SHIGEHISA FUJII
Article type: Article
1980 Volume 36 Issue 3 Pages
322-328
Published: May 01, 1980
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Since our hospital installed the head unit HITACHI CT-250 H in october 1975,we reported the results of maintenace about this equipment. After that we have been measuring periodical CT values twice every week and inspecting regulary it once every four month. On the other hand, in december 1977 equipped with same factory CT-W, the total CT Examination menbers reached one thousand five hundred till August 1979. But on account of prototype, this recently exchanged a new excellent performance CT-W3. Then this opportunity, we have described on the technical problems and improvement items of the former CT-W for sixteen months.
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TOSHIHIKO FUKI
Article type: Article
1980 Volume 36 Issue 3 Pages
329-339
Published: May 01, 1980
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The front plate material of cassette always have been used Bakelite cassette and Aluminum cassette. Bakeltie cassette has low X-ray absorption but poor screen-film contact and heavy. Aluminum cassette provides good screen-film contact but higher X-ray absorption. Bakelite cassette and aluminum cassette was reported by S, Sasaki. M, Nakamura and Y, Yamamoto etc. They are emphasized, front plate material have direct effects upon image quality and patient dose. Recentry, Carbon fibre has developed and applications in space craft and aircraft-, rotating parts, pressure vessels, sporting equipments. I am introduced this Carbon fiber reiforced plastic for X-ray cassette system. Results, X-ray absorption is 20 percent low compare Carbon fiber reinforced plastics cassette (CFRP) with aluminum cassette, therfore enhanced image quality and reduced patient dose. Specially, Carbon fiber reinforced plastic cassette is light weight, tough, elastic and durability (heat, chemicals, pressure etc.). In this study, Carbon fiber reinforced plastic used "TORAYCA" made by Toraya company.
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TADAKAZU FUJII, SHUJI NOBEZAWA, TAMOTSU OSAWA, TOSHIHIKO KANNO, YUKITA ...
Article type: Article
1980 Volume 36 Issue 3 Pages
340-348
Published: May 01, 1980
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In this paper, we measured the radiation doses of a finger from technics in nuclear medicine. (A) In Vitro Test Detail dose distribution within finger tissue from handling a test tube filled with ^<125>I, ^<131>I, and ^<59>Fe in radioimmunoassay were obtained with numerical calculations based on Henson's formula.……(Fig. 1〜4) And, this data were compared with the experimental results of TLD measurement and Field test.…… (Table 1,2) Measured values apporximated the value with numerical calculations. In this result, when we treated ^<125>I (1μCi/2hr/day) at the work, our finger doses might be estimated 6〜150m rads/month. We should not be neglect low dose rate radiation from radioimmunoassay. (B) In Vivo Test In order to study the syringe and vial bottle containing ^<99m>Tc solution, we measured spatial dose around the Pb-shield when that was shielded and nonshielded with TLD method.……(Fig. 6,Fig. 8,and Fig. 11) Isodose distribution from the syringe and vial bottle containing ^<99m>Tc solution were obtained the dosimetry with photographic emulsions.……(Fig. 7,Fig. 10) Dose from a low specific activity source was smaller than that from a high specific activity source at surface of syrings. Radiation dose of finger of personal during the injection in nuclear medicine when syringe was shielded and nonshielded measured with TLD method.……(Table 3) In this result, radiation dose of finger from handling Pb-shielded syringe showed a 64.7 percent decrease as compared with nonshielded syringe.
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KENJI TAKESHITA
Article type: Article
1980 Volume 36 Issue 3 Pages
349-354
Published: May 01, 1980
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KEIJI SHIMIYA
Article type: Article
1980 Volume 36 Issue 3 Pages
355-367
Published: May 01, 1980
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KIYOHIDE SHIBATA
Article type: Article
1980 Volume 36 Issue 3 Pages
368-377
Published: May 01, 1980
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TOSHIHIKO FUKI, [in Japanese], [in Japanese], [in Japanese], [in Japan ...
Article type: Article
1980 Volume 36 Issue 3 Pages
378-381
Published: May 01, 1980
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SUGUHA TSUTSUMI, [in Japanese], [in Japanese]
Article type: Article
1980 Volume 36 Issue 3 Pages
382-385
Published: May 01, 1980
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YOSHIE KODERA
Article type: Article
1980 Volume 36 Issue 3 Pages
386-388
Published: May 01, 1980
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YOSHIHIKO KAWAMURA, MAKOTO SUZUKI, KATSUTOSHI KUMASHIRO, NORIO WATANAB ...
Article type: Article
1980 Volume 36 Issue 3 Pages
389-394
Published: May 01, 1980
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A recognition of a pattern on a radiograph through a visual system was analyzed by introducing the theory of the Gestalt psychology. In this analysis, it was assumed that any pattern on a radiograph can be recognized from view-points of a homogeneity and/or a closed characteristic on the pattern. From this assumption, it was proposed four standard pattern models, into which patterns on any radiograph can be classified entirely. Moreover, the pattern was visually recognized by a total and integrated recognition of a pattern and/or a circumference recognition (a recognition of a line and point, outline of a pattern). A numerical evaluation of the image recognition of a radiograph was performed for the recognition of pattern by using a visual discriminating power on different patterns of Hawlet chart on a radiograph. Since an image quality of the radiograph depends upon factors of physical transmition system, radiographic technique and radiographic part of patient and so on, and affects strongly the image recognition of the radiograph, the image quality of the radiograph was estimated for various conditions of screen-film combinations and tube voltage. The image quality of the radiograph was improved in proportion to logarithm of the exposure in any condition of the screen-film combinations and the tube voltage. Therefore, a high image quality of a radiograph may not be obtained at a low exposure. A combination of a high speed screen and a low speed film better image quality do the radiograph than that of a low speed screen and a high speed film under the same condition of radiographic blacking density and the exposure. Especially a monocolor film, Medichrome, a good image quality on the radiograph in a combination with a high speed screen. Introduction of Gestalt psychology to the radiographic image recognition showed that a screen-film combination having worse homogeneity on the pattern (worse granularity) gave us inferior image quality to that having better homogeneity. Therefore, one important matter to improve the image quality of the radiograph is to improve the granularity on the film for the high speed radiographic system.
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KIYOHIDE SHIBATA
Article type: Article
1980 Volume 36 Issue 3 Pages
394-395
Published: May 01, 1980
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MASARU ADACHI, [in Japanese], [in Japanese]
Article type: Article
1980 Volume 36 Issue 3 Pages
396-398
Published: May 01, 1980
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TETSU SANO, [in Japanese], [in Japanese], [in Japanese]
Article type: Article
1980 Volume 36 Issue 3 Pages
399-400
Published: May 01, 1980
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YUJI KAGA, [in Japanese], [in Japanese], [in Japanese], [in Japanese], ...
Article type: Article
1980 Volume 36 Issue 3 Pages
401-404
Published: May 01, 1980
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NORIKAZU HAYAKAWA, [in Japanese]
Article type: Article
1980 Volume 36 Issue 3 Pages
405-408
Published: May 01, 1980
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AKIRA SUMIDA
Article type: Article
1980 Volume 36 Issue 3 Pages
409-411
Published: May 01, 1980
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YASUYUKI DOI, [in Japanese]
Article type: Article
1980 Volume 36 Issue 3 Pages
412-416
Published: May 01, 1980
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TETSURO KURIHARA, [in Japanese], [in Japanese], [in Japanese], [in Jap ...
Article type: Article
1980 Volume 36 Issue 3 Pages
417-419
Published: May 01, 1980
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KOJI WAKAMATSU
Article type: Article
1980 Volume 36 Issue 3 Pages
419-421
Published: May 01, 1980
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EL Ritman
Article type: Article
1980 Volume 36 Issue 3 Pages
422-
Published: May 01, 1980
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AG Osborn
Article type: Article
1980 Volume 36 Issue 3 Pages
422-
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PM Joseph
Article type: Article
1980 Volume 36 Issue 3 Pages
422-423
Published: May 01, 1980
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CC Morehouse
Article type: Article
1980 Volume 36 Issue 3 Pages
423-
Published: May 01, 1980
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JA Sorenson
Article type: Article
1980 Volume 36 Issue 3 Pages
423-
Published: May 01, 1980
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WW Seelentag
Article type: Article
1980 Volume 36 Issue 3 Pages
423-
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LE Reinstein
Article type: Article
1980 Volume 36 Issue 3 Pages
424-
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DE Bonnett
Article type: Article
1980 Volume 36 Issue 3 Pages
424-425
Published: May 01, 1980
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K. Haber
Article type: Article
1980 Volume 36 Issue 3 Pages
425-
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[in Japanese], [in Japanese]
Article type: Article
1980 Volume 36 Issue 3 Pages
426-
Published: May 01, 1980
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1980 Volume 36 Issue 3 Pages
426-
Published: May 01, 1980
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]
Article type: Article
1980 Volume 36 Issue 3 Pages
426-
Published: May 01, 1980
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]
Article type: Article
1980 Volume 36 Issue 3 Pages
426-427
Published: May 01, 1980
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1980 Volume 36 Issue 3 Pages
427-
Published: May 01, 1980
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[in Japanese]
Article type: Article
1980 Volume 36 Issue 3 Pages
427-
Published: May 01, 1980
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1980 Volume 36 Issue 3 Pages
427-
Published: May 01, 1980
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[in Japanese]
Article type: Article
1980 Volume 36 Issue 3 Pages
427-
Published: May 01, 1980
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[in Japanese]
Article type: Article
1980 Volume 36 Issue 3 Pages
427-
Published: May 01, 1980
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]
Article type: Article
1980 Volume 36 Issue 3 Pages
427-428
Published: May 01, 1980
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]
Article type: Article
1980 Volume 36 Issue 3 Pages
428-
Published: May 01, 1980
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]
Article type: Article
1980 Volume 36 Issue 3 Pages
428-
Published: May 01, 1980
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]
Article type: Article
1980 Volume 36 Issue 3 Pages
428-
Published: May 01, 1980
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1980 Volume 36 Issue 3 Pages
428-
Published: May 01, 1980
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1980 Volume 36 Issue 3 Pages
428-429
Published: May 01, 1980
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1980 Volume 36 Issue 3 Pages
429-
Published: May 01, 1980
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