{"created":"2023-05-15T09:17:21.757079+00:00","id":112,"links":{},"metadata":{"_buckets":{"deposit":"30ac203b-0ba0-42c0-9488-3d7dc92ccbf1"},"_deposit":{"created_by":15,"id":"112","owners":[15],"pid":{"revision_id":0,"type":"depid","value":"112"},"status":"published"},"_oai":{"id":"oai:iuhw.repo.nii.ac.jp:00000112","sets":["1:20"]},"author_link":["805","806","240","236"],"item_10002_biblio_info_7":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"2006-02-10","bibliographicIssueDateType":"Issued"},"bibliographicIssueNumber":"3","bibliographicPageEnd":"8","bibliographicPageStart":"1","bibliographicVolumeNumber":"10","bibliographic_titles":[{"bibliographic_title":"国際医療福祉大学紀要"},{"bibliographic_title":"Bulletin of International University of Health and Welfare","bibliographic_titleLang":"en"}]}]},"item_10002_description_5":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"乳がん検診を目的としたマンモグラフィでは常に安定した高画質の画像を得るために詳細な精度管理項目を定め実施している。しかし,精度管理を行っているにもかかわらず臨床現場においてX線写真の濃度が時期によって変化する事例が見られた。その変動要因として現在の管理項目にはない増感紙(Gd2O2S:Tb)の温度依存性に着目し,増感紙の温度特性と写真濃度の関係について詳細な検討を行なった。マンモグラフィ用の増感紙-フィルム系について,ACR推奨ファントムを用い標準的な撮影条件(28kV,32mAs)のもとで実験を行った結果,増感紙温度が±10℃変化すると濃度は±0.20変化し,規定の管理幅±0.15を越え精度管理上無視できないことが明らかになった。さらに,温度特性のデータをもとに増感紙温度の変化に対し管電流時間積を変えて一定濃度の画像を得る温度補償の方法を提案し,実際にファントム画像を撮影して温度補償が可能であることを確認した。また,増感紙温度を例えば10℃の低温に保つことができれば,20℃〜30℃の場合に比較しX線線量を10〜20%低減できる可能性を示した。","subitem_description_type":"Abstract"}]},"item_10002_description_6":{"attribute_name":"内容記述","attribute_value_mlt":[{"subitem_description":"The X-ray image quality must be good enough and stable to detect breast cancer under mammography examination.\nAlthough standard protocol is established and carried out for the image quality control, it has been found that the X-ray photographic density varies with seasons through a year. Since it is thought that this phenomenon is due to the temperature dependence of fluorescent screen (Gd2O2S:Tb) which is not included in the protocol, the relationship between photographic density of the X-ray image and screen temperature has been studied.\nExperimental results show that the film density varies linearly with screen temperature, and ±10℃ of temperature difference corresponds to ±0.2 of density which is not negligible, at 28kV tube-voltage and 32mAs tube-current exposure-time product.\nUsing these experimental data, it is proposed that the density variations due to the screen temperature change can be compensated by changing the tube-current exposure-time product (mAs). The X-ray image obtained for the ACR standard phantom confirms successful results of the compensation. It is also suggested that if the temperature is kept 10℃, X-ray dose is reduced 10 to 20% comparing 20℃ to 30℃ respectively.","subitem_description_type":"Other"}]},"item_10002_full_name_3":{"attribute_name":"著者別名","attribute_value_mlt":[{"nameIdentifiers":[{}],"names":[{"name":"NEGISHI, Toru"}]},{"nameIdentifiers":[{}],"names":[{"name":"IINUMA, Kazuhiro"}]}]},"item_10002_publisher_8":{"attribute_name":"出版者","attribute_value_mlt":[{"subitem_publisher":"国際医療福祉大学"}]},"item_10002_source_id_11":{"attribute_name":"書誌レコードID","attribute_value_mlt":[{"subitem_source_identifier":"AN1059280X","subitem_source_identifier_type":"NCID"}]},"item_10002_source_id_9":{"attribute_name":"ISSN","attribute_value_mlt":[{"subitem_source_identifier":"13424661","subitem_source_identifier_type":"ISSN"}]},"item_10002_version_type_20":{"attribute_name":"著者版フラグ","attribute_value_mlt":[{"subitem_version_resource":"http://purl.org/coar/version/c_970fb48d4fbd8a85","subitem_version_type":"VoR"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{},{}],"nameIdentifiers":[{}]},{"creatorNames":[{},{}],"nameIdentifiers":[{}]}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2019-05-22"}],"displaytype":"simple","filename":"10_3(1-8p).pdf","filesize":[{"value":"510.6 kB"}],"format":"application/pdf","licensetype":"license_11","mimetype":"application/pdf","url":{"label":"本文(PDF)","url":"https://iuhw.repo.nii.ac.jp/record/112/files/10_3(1-8p).pdf"},"version_id":"5967a929-f051-4455-b526-fbe362ca75be"}]},"item_keyword":{"attribute_name":"キーワード","attribute_value_mlt":[{"subitem_subject":"増感紙","subitem_subject_scheme":"Other"},{"subitem_subject":"湿度特性","subitem_subject_scheme":"Other"},{"subitem_subject":"乳がん検診","subitem_subject_scheme":"Other"},{"subitem_subject":"fluorescent screen","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"temperature dependence","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"breast cancer screening","subitem_subject_language":"en","subitem_subject_scheme":"Other"}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"jpn"}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourcetype":"departmental bulletin paper","resourceuri":"http://purl.org/coar/resource_type/c_6501"}]},"item_title":"マンモグラフィ用増感紙の温度特性と精度管理","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"マンモグラフィ用増感紙の温度特性と精度管理"},{"subitem_title":"Temperature Dependence of Gd2O2S : Tb Fluorescent Screen and Quality Assurance for Mammography Examination","subitem_title_language":"en"}]},"item_type_id":"10002","owner":"15","path":["20"],"pubdate":{"attribute_name":"公開日","attribute_value":"2012-05-22"},"publish_date":"2012-05-22","publish_status":"0","recid":"112","relation_version_is_last":true,"title":["マンモグラフィ用増感紙の温度特性と精度管理"],"weko_creator_id":"15","weko_shared_id":-1},"updated":"2023-05-15T09:27:38.843261+00:00"}