{"created":"2023-05-15T09:17:39.991911+00:00","id":649,"links":{},"metadata":{"_buckets":{"deposit":"10deeabf-3216-438d-873f-da7194c54ddb"},"_deposit":{"created_by":15,"id":"649","owners":[15],"pid":{"revision_id":0,"type":"depid","value":"649"},"status":"published"},"_oai":{"id":"oai:iuhw.repo.nii.ac.jp:00000649","sets":["2:121"]},"author_link":["1516","1518","1515","1517"],"item_10001_biblio_info_7":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"2015-02-15","bibliographicIssueDateType":"Issued"},"bibliographicIssueNumber":"1","bibliographicPageEnd":"40","bibliographicPageStart":"27","bibliographicVolumeNumber":"20","bibliographic_titles":[{"bibliographic_title":"国際医療福祉大学学会誌"},{"bibliographic_title":"Journal of the International University of Health and Welfare","bibliographic_titleLang":"en"}]}]},"item_10001_description_5":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"When we perform head 3D-CTA (three dimensional CT angiography) for the purpose of diagnosing ruptured cerebral aneurysms, minimizing the image noise is vitally important. Increasing the exposure dose used to be necessary to reduce the image noise. Recently iterative reconstruction has been developed to reduce the image noise without increasing the exposure dose. However, some reports point out that the use of iterative reconstruction may lower the resolution in areas where CT value differences are small. It means some degradations of vessel visibility are concerned when iterative reconstruction is used for head 3D-CTA. So the author investigated the optimal setups for iterative reconstruction that would be able to most reduce the exposure dose without the degradation of vessel visibility. The author changed the scan conditions and iterative reconstruction settings in a variety of ways, and scanned the self-making simulated blood vessel phantom. With using these scanned images, vessel visibility was visually evaluated by 10 neurosurgeons. As a result, the settings that can most reduce the exposure dose with maintaining vessel visibility were confirmed. By using iterative reconstruction, the exposure dose can be reduced approximately 30%.","subitem_description_type":"Abstract"}]},"item_10001_description_6":{"attribute_name":"内容記述","attribute_value_mlt":[{"subitem_description":"破裂脳動脈瘤の診断目的で頭部3D-CTA（three dimensional CT angiography）を行う際は，画像ノイズを少なくすることが重要であり，通常，撮影線量を増すため被曝が増大する．逐次近似的画像再構成を用いることで撮影線量は増加させずに画像ノイズを低減でき，被曝が抑えられるようになった．しかし，逐次近似的画像再構成の使用はCT 値差の小さい領域において解像度の低下を招くという報告があり，頭部3D-CTA に逐次近似的画像再構成を利用すると血管描出能の低下が懸念される．そこで，血管描出能は維持しつつ最も被曝が低減できる逐次近似的画像再構成の最適設定条件を検討した．撮影条件や逐次近似的画像再構成の設定値を様々に変化させ，自作した模擬血管ファントムを撮影し，血管描出能を脳神経外科専門医10 名により視覚評価した．その結果，血管描出能は維持しつつ最も被曝が低減できる設定値を確認できた．逐次近似的画像再構成を用いることで約30％の被曝が低減できた．","subitem_description_type":"Other"}]},"item_10001_full_name_3":{"attribute_name":"著者別名","attribute_value_mlt":[{"nameIdentifiers":[{}],"names":[{"name":"Fukuya, Yasukazu"}]},{"nameIdentifiers":[{}],"names":[{"name":"Katsumata, Kenichirou"}]}]},"item_10001_publisher_8":{"attribute_name":"出版者","attribute_value_mlt":[{"subitem_publisher":"国際医療福祉大学学会"}]},"item_10001_radio_20":{"attribute_name":"著者版フラグ","attribute_value_mlt":[{"subitem_radio_item":"publisher"}]},"item_10001_relation_12":{"attribute_name":"NII論文ID（NAID）","attribute_value_mlt":[{"subitem_relation_name":[{"subitem_relation_name_text":"AA12537130"}]}]},"item_10001_source_id_9":{"attribute_name":"ISSN","attribute_value_mlt":[{"subitem_source_identifier":"21863652","subitem_source_identifier_type":"ISSN"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"福谷, 悌和"},{"creatorName":"フクヤ, ヤスカズ","creatorNameLang":"ja-Kana"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"勝俣, 健一郎"},{"creatorName":"カツマタ, ケンイチロウ","creatorNameLang":"ja-Kana"}],"nameIdentifiers":[{}]}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2015-03-04"}],"displaytype":"simple","filename":"20_1(27-40p).pdf","filesize":[{"value":"3.9 MB"}],"format":"application/pdf","licensetype":"license_11","mimetype":"application/pdf","url":{"label":"本文(PDF)","url":"https://iuhw.repo.nii.ac.jp/record/649/files/20_1(27-40p).pdf"},"version_id":"b3aa2821-c3df-477c-8046-d56b5ac462bc"}]},"item_keyword":{"attribute_name":"キーワード","attribute_value_mlt":[{"subitem_subject":"3D-CTA","subitem_subject_scheme":"Other"},{"subitem_subject":"逐次近似的画像再構成","subitem_subject_scheme":"Other"},{"subitem_subject":"血管描出能","subitem_subject_scheme":"Other"},{"subitem_subject":"くも膜下出血","subitem_subject_scheme":"Other"},{"subitem_subject":"3D-CTA","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"iterative reconstruction","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"vessel visibility","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"subarachnoid hemorrhage","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":"journal article","resourceuri":"http://purl.org/coar/resource_type/c_6501"}]},"item_title":"逐次近似的画像再構成を用いた頭部3D-CTA における設定条件の最適化 : 模擬血管ファントムによる検討","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"逐次近似的画像再構成を用いた頭部3D-CTA における設定条件の最適化 : 模擬血管ファントムによる検討"},{"subitem_title":"Optimization of setting conditions for head 3D-CTA using iterative reconstruction : Investigating setting conditions using simulated vessel phantoms","subitem_title_language":"en"}]},"item_type_id":"10001","owner":"15","path":["121"],"pubdate":{"attribute_name":"公開日","attribute_value":"2015-03-04"},"publish_date":"2015-03-04","publish_status":"0","recid":"649","relation_version_is_last":true,"title":["逐次近似的画像再構成を用いた頭部3D-CTA における設定条件の最適化 : 模擬血管ファントムによる検討"],"weko_creator_id":"15","weko_shared_id":-1},"updated":"2023-06-21T10:43:54.600518+00:00"}