{"created":"2023-06-23T12:14:52.395519+00:00","id":3467,"links":{},"metadata":{"_buckets":{"deposit":"6243de2c-2443-48b0-b2fe-5b726d9dc398"},"_deposit":{"created_by":21,"id":"3467","owners":[21],"pid":{"revision_id":0,"type":"depid","value":"3467"},"status":"published"},"_oai":{"id":"oai:asahi-u.repo.nii.ac.jp:00003467","sets":["46:190:197"]},"author_link":["559","8842","343","3954","4219","4210","2646"],"item_10002_biblio_info_77":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"2014-06-20","bibliographicIssueDateType":"Issued"},"bibliographicIssueNumber":"1","bibliographicPageEnd":"17","bibliographicPageStart":"8","bibliographicVolumeNumber":"41","bibliographic_titles":[{"bibliographic_title":"岐阜歯科学会雑誌"},{"bibliographic_title":"The Journal of Gifu Dental Society","bibliographic_titleLang":"en"}]}]},"item_10002_description_80":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"全身用マルチスライスCT(MSCT)と歯科用コーンビームCT(CBCT)は画像濃度の特性が異なる事が報告されている。我々は、コンピューター支援(CAD)検出システムの歯を自動的に検出する機能を利用して、両者の濃度特性を比較検討した。被写体として、生体の歯や骨と同等のX線吸収を示す人工硬組織を備えた頭部ファントムを用いた。ファントムに銀合金、金銀パラジウム合金、およびストッピングで作製した模擬補綴物を装着した状態、および補綴物のない状態でCT撮影を行った。CT画像を、画像濃度を基にして歯を周囲組織から分離する機能を持つCADプログラムで処理した。画像のウインドウ幅(WW)およびウインドウ値(WL)を変えながら処理を繰り返し、最も多くの歯が識別可能であった至適WWおよびWLを求めた。歯に欠損のない患者40名のMSCTおよびCBCT画像についても同様の検討をおこなった。ファントムによる検討の結果、歯列上に補綴物がない場合、至適WW、WLは、MSCTとCBCTで大きな違いがなかった。歯列上に補綴物がある場合、CBCTのみに至適WW、WLの低下が紐められた。生体の画像による検討では、MSCTの至適WW、WLはほぼ一定であったのに対して、CBCTでは至適WW、WLが広く分散していた。MSCTとCBCTの相違は、以下の要因に因ると考えられた。\n1)MSCTは画像濃度の基準としてハンスフィールド値を採用しているが、CBCTはしていない事。\n2)CBCTの平面検出器は、MSCTの線検出盟よりも金属補綴物の影響を受けやすい事。","subitem_description_type":"Abstract"}]},"item_10002_full_name_75":{"attribute_name":"著者別名","attribute_value_mlt":[{"affiliations":[{"affiliationNames":[{"affiliationName":"","lang":"ja"}],"nameIdentifiers":[]}],"familyNames":[{"familyName":"羽柴","familyNameLang":"ja"},{"familyName":"HASHIBA","familyNameLang":"en"}],"givenNames":[{"givenName":"元裕","givenNameLang":"ja"},{"givenName":"MOTOHIRO","givenNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"559","nameIdentifierScheme":"WEKO"},{"nameIdentifier":"9000005487291 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