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Article type: Cover
1997 Volume 53 Issue 3 Pages
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Article type: Cover
1997 Volume 53 Issue 3 Pages
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Article type: Index
1997 Volume 53 Issue 3 Pages
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Article type: Index
1997 Volume 53 Issue 3 Pages
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[in Japanese]
Article type: Article
1997 Volume 53 Issue 3 Pages
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Article type: Appendix
1997 Volume 53 Issue 3 Pages
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1997 Volume 53 Issue 3 Pages
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1997 Volume 53 Issue 3 Pages
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1997 Volume 53 Issue 3 Pages
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AKANE UTSUNOMIYA, JUNJI SHIRAISHI
Article type: Article
1997 Volume 53 Issue 3 Pages
363-367
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It was considered that the method of sampling is an important factor in the statistical evaluation of results obtained from observer studies in receiver operating characteristic(ROC)analyses. However, few papers have discussed the effect of selection. This study evaluated the effects of the method of selection on ROC analysis by using the results of past ROC experiments. Furthermore, a new approach to collecting case samples that can reduce the number of samples without decreasing statistical reliability was presented. Our study employed a combination of random sampling and stratified sampling. The statistical reliability of our method was evaluated by testing statistically significant differences between several combinations of sampling methods and populations of case samples.
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NOBORU SHIGETANI, EISYU SHINKAI, SEISUKE EZOE
Article type: Article
1997 Volume 53 Issue 3 Pages
368-372
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In determining of the conversion factor of I. I., dose rate and luminance are usually examined separately. This method, though, can be a cause of unstable reproducibility of X-ray output because of the actual fluctuation in X-ray dosage. To solve this problem, we developed a new parallel plate ionization chamber which enables the simultaneous measurement of dose rate and luminance. We present the characteristics of this ionization chamber, by means of comparison with the IONEX chamber. We also describe the use of the dosimeter. The chamber was considered effective for controling I. I. luminance.
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NOBUHISA FUJIMOTO, NOBORU OOGAMA, MOTOHIRO NISHITANI, KATSUHIKO YAMADA
Article type: Article
1997 Volume 53 Issue 3 Pages
373-379
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It is important to correct for the energy response of the X-ray detector in measuring X-ray leakage from the protective barrier of the examination room. However, measurement of effective energy of leakage X-rays is very difficult in the clinical setting. In this paper, we deiscuss a method for estimating the effective energy of both primary and scattered X-rays. This method is based on the measurement of leakage X-ray spectra using a semiconductor-fitted X-ray detector and analyzing the relationship between X-ray tube voltage and effective energy. In this study, we found that the effective energy of leakage X-rays was not dependent on the thickness of shielding materials like concrete and lead. With the concrete barrier, it was possible to express the relationship between X-ray tube voltage and the effective energy of leakage X-rays with a simple approximate equation. With the lead-lined barrier, the absorption of the K-edge of lead needs to be considered in estimating the effective energy of leakage X-rays at relatively high tube voltages.
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TOSHIMINE YABUTANI, YUKIO ENDO, SHOUICHI SUZUKI, HIDEKI KATO, HIDETOSH ...
Article type: Article
1997 Volume 53 Issue 3 Pages
380-385
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The quality of portal images can be improved by the use of computed radiography(CR)with storage phosphor technology instead of the conventional screen-film system. The frequency processing of portal images, however, sometimes produces artifacts in the field margin, which may decrease the precision of verification of the irradiation field. The object of our study was to clarify the optimum parameters of frequency processing for CR portal imaging. The FCR-7000 system with 4MV X-ray was employed. Our results showed that the usual parameters of frequency processing and irradiation field size, were useful in verifying the irradiation field. However, artifacts are likely to have an effect, especially extreme parameters of frequency processing and small fields. In addition, the following wre important in selecting the parameters of frequency processing:1)the band of frequency should be selected according to field width and frequency(RN3:0.25cycle/mm), 2)the type of frequency should be used the graininess emphasis, 3)the emphasis should be minimized(RE3.0).
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Akihiro TANIMOTO
Article type: Article
1997 Volume 53 Issue 3 Pages
386-393
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HISASHI MAEKOSHI, [in Japanese], [in Japanese], [in Japanese], [in Jap ...
Article type: Article
1997 Volume 53 Issue 3 Pages
394-397
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KAORU MORIKAWA
Article type: Article
1997 Volume 53 Issue 3 Pages
398-
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TORU KIKUCHI
Article type: Article
1997 Volume 53 Issue 3 Pages
398-399
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IZUMI OGURA
Article type: Article
1997 Volume 53 Issue 3 Pages
399-400
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TOMIO NAKAJU
Article type: Article
1997 Volume 53 Issue 3 Pages
400-401
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TADASHI SUNAYASHIKI
Article type: Article
1997 Volume 53 Issue 3 Pages
402-
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KYOHITO IIDA
Article type: Article
1997 Volume 53 Issue 3 Pages
402-403
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JUNICHI KIMURA
Article type: Article
1997 Volume 53 Issue 3 Pages
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KENJI SHINOMIYA
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1997 Volume 53 Issue 3 Pages
404-
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[in Japanese]
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1997 Volume 53 Issue 3 Pages
404-406
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[in Japanese]
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1997 Volume 53 Issue 3 Pages
407-409
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[in Japanese]
Article type: Article
1997 Volume 53 Issue 3 Pages
410-
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Article type: Appendix
1997 Volume 53 Issue 3 Pages
411-412
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[in Japanese], [in Japanese]
Article type: Article
1997 Volume 53 Issue 3 Pages
413-
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[in Japanese], [in Japanese]
Article type: Article
1997 Volume 53 Issue 3 Pages
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[in Japanese], [in Japanese]
Article type: Article
1997 Volume 53 Issue 3 Pages
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[in Japanese], [in Japanese]
Article type: Article
1997 Volume 53 Issue 3 Pages
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[in Japanese], [in Japanese]
Article type: Article
1997 Volume 53 Issue 3 Pages
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Article type: Article
1997 Volume 53 Issue 3 Pages
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[in Japanese], [in Japanese]
Article type: Article
1997 Volume 53 Issue 3 Pages
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Article type: Article
1997 Volume 53 Issue 3 Pages
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[in Japanese], [in Japanese]
Article type: Article
1997 Volume 53 Issue 3 Pages
414-
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Article type: Article
1997 Volume 53 Issue 3 Pages
414-
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[in Japanese], [in Japanese]
Article type: Article
1997 Volume 53 Issue 3 Pages
414-
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[in Japanese], [in Japanese]
Article type: Article
1997 Volume 53 Issue 3 Pages
414-
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[in Japanese], [in Japanese]
Article type: Article
1997 Volume 53 Issue 3 Pages
414-
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[in Japanese], [in Japanese]
Article type: Article
1997 Volume 53 Issue 3 Pages
414-
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[in Japanese], [in Japanese]
Article type: Article
1997 Volume 53 Issue 3 Pages
414-
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[in Japanese], [in Japanese]
Article type: Article
1997 Volume 53 Issue 3 Pages
414-
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[in Japanese], [in Japanese]
Article type: Article
1997 Volume 53 Issue 3 Pages
414-
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[in Japanese]
Article type: Article
1997 Volume 53 Issue 3 Pages
415-
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[in Japanese]
Article type: Article
1997 Volume 53 Issue 3 Pages
415-
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[in Japanese]
Article type: Article
1997 Volume 53 Issue 3 Pages
415-
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[in Japanese]
Article type: Article
1997 Volume 53 Issue 3 Pages
415-
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[in Japanese], [in Japanese]
Article type: Article
1997 Volume 53 Issue 3 Pages
415-
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[in Japanese], [in Japanese]
Article type: Article
1997 Volume 53 Issue 3 Pages
415-
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