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Volume 57, Issue 1
Displaying 1-32 of 32 articles from this issue
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Article type: Cover
2001 Volume 57 Issue 1 Pages Cover1-
Published: January 20, 2001
Released on J-STAGE: June 30, 2017
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Article type: Cover
2001 Volume 57 Issue 1 Pages Cover2-
Published: January 20, 2001
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Article type: Index
2001 Volume 57 Issue 1 Pages Toc1-
Published: January 20, 2001
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Article type: Index
2001 Volume 57 Issue 1 Pages Toc2-
Published: January 20, 2001
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[in Japanese]Article type: Article
2001 Volume 57 Issue 1 Pages I-
Published: January 20, 2001
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Article type: Appendix
2001 Volume 57 Issue 1 Pages II-
Published: January 20, 2001
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Article type: Appendix
2001 Volume 57 Issue 1 Pages II-
Published: January 20, 2001
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Article type: Appendix
2001 Volume 57 Issue 1 Pages III-XI
Published: January 20, 2001
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Article type: Appendix
2001 Volume 57 Issue 1 Pages XII-
Published: January 20, 2001
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Article type: Appendix
2001 Volume 57 Issue 1 Pages XIII-
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Article type: Appendix
2001 Volume 57 Issue 1 Pages XIV-
Published: January 20, 2001
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YOICHIRO UMEGAKI, SUMIO MAKINO, HIROSHI FUJITA, [in Japanese]Article type: Article
2001 Volume 57 Issue 1 Pages 1-11
Published: January 20, 2001
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Hiroshi MatsuuraArticle type: Article
2001 Volume 57 Issue 1 Pages 12-16
Published: January 20, 2001
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KAZUO AWAIArticle type: Article
2001 Volume 57 Issue 1 Pages 17-
Published: January 20, 2001
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SHIGEKI TANIArticle type: Article
2001 Volume 57 Issue 1 Pages 18-20
Published: January 20, 2001
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ATSUSHI TAMURAArticle type: Article
2001 Volume 57 Issue 1 Pages 21-23
Published: January 20, 2001
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HIROSHI MIZUTANIArticle type: Article
2001 Volume 57 Issue 1 Pages 23-25
Published: January 20, 2001
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TAKAYOSHI IZUMIArticle type: Article
2001 Volume 57 Issue 1 Pages 25-29
Published: January 20, 2001
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SHIGERU OHNOArticle type: Article
2001 Volume 57 Issue 1 Pages 29-32
Published: January 20, 2001
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KAZUO AWAI, [in Japanese], [in Japanese], [in Japanese], [in Japanese] ...Article type: Article
2001 Volume 57 Issue 1 Pages 33-48
Published: January 20, 2001
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JUNICHI IKUSEArticle type: Article
2001 Volume 57 Issue 1 Pages 49-50
Published: January 20, 2001
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MASAYUKI TACHIBANA, MAMIKO HARAGUCHIArticle type: Article
2001 Volume 57 Issue 1 Pages 51-58
Published: January 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL FREE ACCESSPatient exposure in computed tomography should be estimated as absorbed dose, not as entrance skin exposure. The energy spectra of x-rays need to be measured as well. However, the energy spectra of x-rays are not equal throughout the scanning field, because a beam-shaping filter normally is used. Therefore we measured x-ray spectra in the center and the periphery of the scanning field with a spectrum analyzer. We studied the effect of the beam-shaping filter on the conversion of absorbed dose in a PMMA phantom. The difference in the absorbed dose conversion factor was found to be 1.58% in the PMMA phantom. This could be disregard as an effect on conversion of the absorbed dose.View full abstractDownload PDF (1032K) -
HAJIME SAITO, TOSHIO TAKE, TSUGUNORI IWAI, MASAMI NAKAMURA, NORIKAZU K ...Article type: Article
2001 Volume 57 Issue 1 Pages 59-67
Published: January 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL FREE ACCESSPurpose: Tomography can be carried out with either the CR method using an IP or the conventional screen/film system. In our institute, a new, straight linear tomography function was added to I.I./TV-DR. We report on the gap functional fundamental characteristics of our system. Methods: The fundamental characteristics of I.I./TV-DR were measured using a lattice chart by observing the tomographic shape and location of the target plane. DIC and TBLB of tomography were also evaluated in terms of clinical application. Results: The main characteristic of I.I./TV-DR is the ring-formed shape of the target plane image, and the width of the ring changes in relation to exposure angle. The tomographic planes at the central part and the periphery were different in height. In terms of clinical application, I.I./TV-DR fluorography combined with tomography may enhance diagnostic ability.View full abstractDownload PDF (3140K) -
MASAMI SATO, YOICHI EGUCHI, KINICHI YAMADA, YUJI KAGA, YUTAKA ENDO, TA ...Article type: Article
2001 Volume 57 Issue 1 Pages 68-77
Published: January 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL FREE ACCESSWe evaluated the imaging performance of a flat-panel detector digital radiography system (CXDI-11 X-ray Digital Camera, Canon Inc.) and a computed radiography system (FCR9000C-HQ, Fuji Film). The characteristics of the two detectors and of the overall systems were compared. This included evaluation and comparison of the fundamental physical characteristics, including x-ray response curve, modulation transfer function (MTF), Wiener spectra, noise-equivalent quanta, and x-ray tube voltage-dependent detector response. Overall system performance was evaluated using receiver operating characteristic (ROC) analysis. The results of the study showed that the dynamic range of the CXDI-11 measured relative to the input x-ray flux was 10^3, similar to that of the FCR9000C-HQ. Both systems showed similar final MTFs, although the pre-sampling MTF of the CXDI-11 was better than that of the FCR9000C-HQ. Noise analysis, based on noise-equivalent quanta and Wiener spectra, showed that for normal exposure conditions the CXDI-11 had superior performance. With both systems, x-ray response (system output/incident x-ray exposure) increased with increasing x-ray tube voltage. ROC analysis indicated that the CXDI-11 was superior in overall performance.View full abstractDownload PDF (1257K) -
TAKASHI AMANO, SHINJI SUEMORI, AKIKO HAYASHI, SHINICHI ARAO, AKIRA KIT ...Article type: Article
2001 Volume 57 Issue 1 Pages 78-85
Published: January 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL FREE ACCESSThe objective of this study was to determine experimentally whether a characteristic curve obtained in a one-side emulsifier photo acceptance system is dependent on radiation quality. Experiments focusing on the following three points were carried out to examine the direct effect of x-rays on the direct sensitization of silver halide in film: 1)Relation between x-ray energy and a sensitization factor. 2)Effect of change in a sensitization factor on a characteristic curve. 3)Comparison of characteristic curve forms. X-ray tube voltage was set in a range from 28 kV (mammography) to 80 kV (general imaging). Although it has generally been considered that the dependence of a characteristic curve on radiation quality is small enough to be neglected, a statistically significant difference was observed in the foot and shoulder regions by comparing characteristic curves of 28 kV and 80 kV. The change in the form of the characteristic curve in the foot region was small, however. Thus, it was revealed that it can be applied to effective light exposure transformation such as the modulation transfer function in the characteristic curve obtained by x-ray energy in the general imaging region. A test of the significance of differences was carried out to compare characteristic curve forms, and the effectiveness of the test results are discussed.View full abstractDownload PDF (1023K) -
HIROKO NISHIDE, MASAMI MIYASHITA, KAORI MURATA, YOSHIKAZU OGAWA, FUJIK ...Article type: Article
2001 Volume 57 Issue 1 Pages 86-91
Published: January 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL FREE ACCESSMammographic screen-film cassettes require quality control to obtain high definition in mammographic images. Evaluating screen-film contact is necessary for quality control because poor screen-film contact results in image degradation. Areas of poor contact are detected as darker regions in a copper mesh test pattern. However, we have not obtained any information regarding poor contact. Using an embedded spacer, we examined how trapped air caused by poor contact influenced density. With a fixed amount of trapped air space, the difference between optical average density in areas of good contact and those of poor contact increased according to the increase in milliampere-seconds. In addition, the microdensitometer density of wire in areas of good contact did not change, whereas that in areas of poor contact increased. Under a condition of fixed exposure, the optical average density for areas of poor contact increased according to increases in the amount of trapped air space. It is considered that suitable exposure is required to evaluate screen-film contact using a copper mesh.View full abstractDownload PDF (1403K) -
Article type: Appendix
2001 Volume 57 Issue 1 Pages 92-95
Published: January 20, 2001
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Article type: Appendix
2001 Volume 57 Issue 1 Pages 96-
Published: January 20, 2001
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Article type: Appendix
2001 Volume 57 Issue 1 Pages 96-
Published: January 20, 2001
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Article type: Appendix
2001 Volume 57 Issue 1 Pages 97-98
Published: January 20, 2001
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JOURNAL RESTRICTED ACCESSTo protect personal information, PDF files cannot be viewed.View full abstractDownload PDF (141K) -
Article type: Appendix
2001 Volume 57 Issue 1 Pages 99-100
Published: January 20, 2001
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Article type: Cover
2001 Volume 57 Issue 1 Pages Cover3-
Published: January 20, 2001
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