著者

友光 達志 川勝 充 北山 彰 成田 憲彦 増田 一孝 鹿沼 成美 東田 善治 森田 陸司 山本 逸雄

出版者

公益社団法人 日本放射線技術学会

雑誌

日本放射線技術学会雑誌 (ISSN:03694305)

巻号頁・発行日

vol.55, no.2, pp.165-187, 1999-02-20 (Released:2017-06-30)

参考文献数

15

被引用文献数

1 1

著者

東田 善治 井手口 忠光 村中 光 田畑 信幸 宮島 隆一 赤澤 史生 池田 尋隆 森本 健 大喜 雅文 豊福 不可依 土井 邦雄 Higashida Yoshiharu Ideguchi Tadamitsu Muranaka Toru Tabata Nobuyuki Miyajima Ryuichi Akazawa Fumio Ikeda Hirotaka Morimoto Ken Ohki Masafumi Toyofuku Fukai Doi Kunio ヒガシダ ヨシハル イデグチ タダミツ ムラナカ トオル タバタ ノブユキ ミヤジマ リュウイチ アカザワ フミオ イケダ ヒロタカ モリモト ケン オオキ マサフミ トヨフク フカイ ドイ クニオ

出版者

日本医学放射線学会

雑誌

日本医学放射線学会雑誌 (ISSN:00480428)

巻号頁・発行日

vol.64, no.1, pp.35-40, 2004-01-25

著者

東田 善治

出版者

一般社団法人 日本医学物理学会

雑誌

放射線医学物理 (ISSN:09188010)

巻号頁・発行日

vol.16, no.3, pp.172-177, 1996-09-30 (Released:2012-09-24)

参考文献数

13

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The image quality of mammogram has improved over the past 2 decades as a result of the development of specially designed mammography unit. For mammography to achieve high sensitivity and specificity, all aspects of the imaging process must be optimized. This paper describes the recent development in breast imaging technologies, including design of the x-ray equipment (traget and filtration materials), detector (screen-film system), and processing used for mammography. The methods for acceptance testing and quality control on mammography have been also reported.

著者

畠中 史朗 杜下 淳次 樗木 晶子 野口 ゆかり 外園 栄作 小宮 陽子 東田 善治 島ノ江 信芳 中村 邦夫 田代 洋行

出版者

公益社団法人 日本放射線技術学会

雑誌

日本放射線技術学会雑誌 (ISSN:03694305)

巻号頁・発行日

vol.65, no.11, pp.1512-1518, 2009-11-25 (Released:2009-12-18)

参考文献数

12

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Variation in the luminance ratio of a cathode ray tube(CRT)monitor and the ultrasonographic images at different levels of ambient light(0–150 lux)was investigated to obtain optimum ambient light in the ultrasonography suite. The maximum and minimum luminances of test patterns and ultrasonographic images were measured after three technicians independently optimized the brightness and contrast of the CRT monitor and ultrasonographic images at different levels of ambient light. Furthermore, the luminance ratio was calculated from the maximum luminance divided by the minimum luminance. When ambient light increased, it was difficult for the technicians to optimize the brightness and contrast settings of the CRT monitor to maintain a high luminance ratio at 0 lux. The luminance ratio decreased rapidly as ambient light increased up to 20 lux. However, the luminance ratio decreased gradually when ambient light was higher than 20 lux. It is necessary to take into consideration the ambient light to maintain a high luminance ratio of ultrasonographic images.

著者

熊谷 エツ子 田中 龍二 熊谷 崇 東田 善治 尾道 三一 中村 郁夫 田上 省三 甲木 孝人 澤田 昭三

出版者

Journal of Radiation Research 編集委員会

雑誌

Journal of Radiation Research (ISSN:04493060)

巻号頁・発行日

vol.29, no.3, pp.203-210, 1988-09-15 (Released:2006-06-16)

参考文献数

28

被引用文献数

3 1 4

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To clarify the long-term effects of occupational exposure to low doses of radiation, Epstein-Barr virus (EBV)-specific antibody titers in sera from 104 radiological technologists (R.T.) and 118 controls in Kumamoto prefecture were measured by the immunofluorescence method. Antibody titers to viral capsid antigen (VCA)-IgG increased with the years of experience as R.T., and the prevalence of abnormal antibody titers to both VCA-IgG and early antigen (EA)-IgG were significantly higher in R.T. with over 15 years of experience or 30 rads of cumulative radiation dose than in the controls. However, there was no correlation between exposure and the frequency of abnormal EBV-associated nuclear antigen (EBNA) antibody titers. The EBV-specific antibody titers of 24 Hiroshima atomic-bomb survivors were also measured. They were similar to those of the R.T. with over 30 years of experience. The EBV-specific antibody titers of R.T. suggest that there may be an impairment of immunologic competence after continuous long-term exposure to low doses of radiation. Also, the correlation of EBV-specific antibody titers and frequency of cells with chromosome aberrations in 53 R.T. was studied. Some correlations were found between the antibody titers to both of the VCA-IgG and EBNA and the frequency of cells with chromosome aberrations.

著者

熊谷 エツ子 田中 龍二 熊谷 崇 東田 善治 尾道 三一 中村 郁夫 田上 省三 甲木 孝人 澤田 昭三

出版者

日本放射線影響学会

雑誌

Journal of Radiation Research (ISSN:04493060)

巻号頁・発行日

vol.29, no.3, pp.203-210, 1988-09

被引用文献数

1 1

---

To clarify the long-term effects of occupational exposure to low doses of radiation, Epstein-Barr virus (EBV)-specific antibody titers in sera from 104 radiological technologists (R.T.) and 118 controls in Kumamoto prefecture were measured by the immunofluorescence method. Antibody titers to viral capsid antigen (VCA)-IgG increased with the years of experience as R.T., and the prevalence of abnormal antibody titers to both VCA-IgG and early antigen (EA)-IgG were significantly higher in R.T. with over 15 years of experience or 30 rads of cumulative radiation dose than in the controls. However, there was no correlation between exposure and the frequency of abnormal EBV-associated nuclear antigen (EBNA) antibody titers. The EBY-specific antibody titers of 24 Hiroshima atomic-bomb survivors were also measured. They were similar to those of the R.T.with over 30 years of experience. The EBV-specific antibody titers of R.T. suggest that there may be an impairment of immunologic competence after continuous long-term exposure to low doses of radiation. Also, the correlation of EBV-specific antibody titers and frequency of cells with chromosome aberrations in 53 R.T. was studied. Some correlations were found between the antibody titers to both of the VCA-IgG and EBNA and the frequency of cells with chromosome aberrations.

著者

藤田 広志 志村 一男 白石 順二 西原 貞光 東田 善治 山下 一也

出版者

公益社団法人日本放射線技術学会

雑誌

日本放射線技術學會雜誌 (ISSN:03694305)

巻号頁・発行日

vol.49, no.9, pp.1685-1703, 1993-09-01

被引用文献数

16

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This professional Committee's report describes the results of the activities made by the Task Group for ROC Analysis in Digital Radiography in 1992. Beginning with interpreting the basis of ROC analysis, explanation is made of ROC curve fitting and ROC curve's statistically significant difference test. Next, explanation is made of LROC and FROC with the development from FROC to AFROC, as well as "continuous confidence method" (provisional designation) as the recent progress in ROC analysis, including its brief experimental results. Finally, report is made in the actual condition of ROC analysis in DR system and the investigational results of ROC analysis of CAD.