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Article type: Cover
1978 Volume 34 Issue 2 Pages
Cover4-
Published: July 01, 1978
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Article type: Cover
1978 Volume 34 Issue 2 Pages
Cover5-
Published: July 01, 1978
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Article type: Appendix
1978 Volume 34 Issue 2 Pages
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Published: July 01, 1978
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TSUTOMU NAKANO
Article type: Article
1978 Volume 34 Issue 2 Pages
97-100
Published: July 01, 1978
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Summary The popular method of estimating tissue-air ratio was investigated by Onai et al. This is polynominal approximation for paramaters k and m which are expressed in Pfalzner's general formula. I made and approximation with three exponential functions for tissue-air ratio of cobalt 60 gamma radiation. It can be seen that. TAR [numerical formula] where l (cm) is one dimension of square filed, and d (cm) is the depth of interest. The result indicates that the errors are less than 2% in range of 0.5≤d≤20cm, 4≤l≤20cm
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TAKAYUKI SHIBAYAMA, HISAKATU MATUURA
Article type: Article
1978 Volume 34 Issue 2 Pages
101-110
Published: July 01, 1978
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Summary We have developed specially designed compression immobilizer mede of blistered poly-stylene, to improve the image quality in magnification mammography, especially for mediolateral projection. The evaluated practical benefits of this particular device was as follows : 1. The X-ray absorption by this compresser was minimum, comparing with other devices. There was no detrimental influences on film images produced by this immobilizer. 2. The application in clinical practice was very simple. 3. The motion blurr was thoroughly excluded. 4. The kilovoltages can be lowered due to the evenly decreased thickness of the subjects. Accordingly the diagnostic information volume was significantly increased because of significantly improved X-ray contrast. 5. The glandular structures in dense breast such as of virginal, lactation stages was demonstrable by this compresser. 6. The almost identically dense film opacities were provided both in subareolar and base region. The introduction of this device to the technique in magnification mammography is considered invaluably important.
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TAKAYUKI SHIBAYAMA, HISAKATU MATUURA, SATOSHI KATO, SHOGO SUZUKI, KOUZ ...
Article type: Article
1978 Volume 34 Issue 2 Pages
111-116
Published: July 01, 1978
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Summary The roentgenography table for craniocaudad projection has been developed in our department particularly to facilitate the application of the same compression immobilizer as for mediolateral projection. The clinical usefulness of these two inventions, table and immobilizer, was evaluated in craniocaudad two times magnification mammography. The obtained results were as follows : 1. The positioning was much easier and more precise than the conventional method. 2. The spreading of the base of breast gland and the retromammary space produced by the compression invited significant increase of the diagnostic information source. 3. The improvement of the quality of film images was so impressive in sharpness, contrast and resol ving power. 4. The carefully designed lead protector which was furnished on the table quaranteed thouroughly negligible gonad dose. The combination of these particular table and immobilizer is considered significant for the improvement of the film images of magnification mammography.
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TAKAYUKI SHIBAYAMA, SHOGO SUZUKI, KOUZO YAMAGUTI
Article type: Article
1978 Volume 34 Issue 2 Pages
117-125
Published: July 01, 1978
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Summary Rare earth-intensifying screen (LM, LU, G4,G8,GTS, GTH) has been used in our department to decrease x-ray exposure and to improve the film images, in combination with high speed-single emulsion-fine grain film (Low-D). Its clinical significance was evaluated in comparison with conventional film and screen combination. The obtained results were as follows : 1. The overall sensitivities of each combination were RP/TL+HS : RP/TL+LM : RP/TL+LU : Lo-D+LM : Lo-D+LU=1 : 2 : 3 : 6 : 9.5 2. The overall graininess of the combination with rare earth screen showed only slight degrading, comparing with that with conventional screens. 3. The demonstrability of malignant microcalcifications was best in RP/TL+LM, second best in RP/TL+LU and Lo-D+LM. The microcalcifications with 150 microns in diameter can be clearly demonstrated at 25 kVp in those combinations. 4. In clinical practice, Lo-D+LM showed best results, because of its sensitivity and graininess. The standard exposure factors in this combination were 25 kVp, 7 mA, 3 sec, FFD : 70 cm, 2 fold magnification. 5. The skin surface dose in the combination "Lo-D+LM" was 430 mR which is one third of conventional method. In conclusion, "Lo-D+LM" combination is considered to be most recommendable for magnification mammography technique.
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[in Japanese], [in Japanese]
Article type: Article
1978 Volume 34 Issue 2 Pages
126-153
Published: July 01, 1978
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Article type: Appendix
1978 Volume 34 Issue 2 Pages
154-155
Published: July 01, 1978
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]
Article type: Article
1978 Volume 34 Issue 2 Pages
156-
Published: July 01, 1978
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1978 Volume 34 Issue 2 Pages
156-
Published: July 01, 1978
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[in Japanese]
Article type: Article
1978 Volume 34 Issue 2 Pages
156-
Published: July 01, 1978
Released on J-STAGE: June 28, 2017
JOURNAL
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[in Japanese], [in Japanese], [in Japanese]
Article type: Article
1978 Volume 34 Issue 2 Pages
156-
Published: July 01, 1978
Released on J-STAGE: June 28, 2017
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1978 Volume 34 Issue 2 Pages
156-157
Published: July 01, 1978
Released on J-STAGE: June 28, 2017
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]
Article type: Article
1978 Volume 34 Issue 2 Pages
157-
Published: July 01, 1978
Released on J-STAGE: June 28, 2017
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1978 Volume 34 Issue 2 Pages
157-
Published: July 01, 1978
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[in Japanese], [in Japanese]
Article type: Article
1978 Volume 34 Issue 2 Pages
157-
Published: July 01, 1978
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Ingvar Andersson
Article type: Article
1978 Volume 34 Issue 2 Pages
158-
Published: July 01, 1978
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Stephen B. Fierstien
Article type: Article
1978 Volume 34 Issue 2 Pages
158-
Published: July 01, 1978
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Kjell Jonsson
Article type: Article
1978 Volume 34 Issue 2 Pages
158-
Published: July 01, 1978
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Helene Pavlov
Article type: Article
1978 Volume 34 Issue 2 Pages
158-
Published: July 01, 1978
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Helene Pavlov
Article type: Article
1978 Volume 34 Issue 2 Pages
158-159
Published: July 01, 1978
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Article type: Appendix
1978 Volume 34 Issue 2 Pages
160-166
Published: July 01, 1978
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Article type: Appendix
1978 Volume 34 Issue 2 Pages
167-
Published: July 01, 1978
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Article type: Cover
1978 Volume 34 Issue 2 Pages
Cover6-
Published: July 01, 1978
Released on J-STAGE: June 28, 2017
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