{"created":"2023-05-15T14:38:45.531186+00:00","id":53313,"links":{},"metadata":{"_buckets":{"deposit":"dffc899a-4945-4c46-97cf-ae01f78dd1f0"},"_deposit":{"created_by":1,"id":"53313","owners":[1],"pid":{"revision_id":0,"type":"depid","value":"53313"},"status":"published"},"_oai":{"id":"oai:repo.qst.go.jp:00053313","sets":["2"]},"author_link":["544097","544102","544104","544100","544096","544098","544101","544103","544099"],"item_10003_biblio_info_7":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"2004","bibliographicIssueDateType":"Issued"},"bibliographicPageStart":"000","bibliographic_titles":[{"bibliographic_title":"Proceedings of SPIE"}]}]},"item_10003_description_5":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"[Purpose] We have developed a four-dimensional CT (4D-CT) using continuous rotation of cone-beam x-ray. The maximum field of view for 4D-CT is 128mm at the center of rotation in the longitudinal direction. In order to obtain appropriate estimations of exposure dose, we have measured dose profiles perpendicular to the rotation axis in a lucite cylinder of 320mm diameter.\n[Methods] We have used cylindrical lucite phantom of 320mm diameter and 750mm length. Dose profiles were measured at the center and a peripheral point of 10mm depth. A pin silicon photodiode sensor with 3x3x3mm sensitive region was used as an x-ray detector, which was scanned along longitudinal direction in the phantom for collimator widths of 10, 32, 64, 96 and 128mm.\n[Results] The dose profiles had long tails caused by scattered radiation. For 128 mm collimator width 90% of integral dose was distributed along 350mm length at the center and 220mm at the periphery. Even for 10 mm collimator width 90% of integral dose was distributed along 250mm length at the center and 160mm length at the periphery. [New or breakthrough work to be presented] Before the advent of multi-detector CT CTDI100 was a good estimation of exposure dose, because it expressed approximate integral dose for clinical scan conditions. For 4D-CT employing a variable collimator, the standard CTDI was not a good estimation. In the present work we measured dose profiles for 4D-CT, and showed long tails distributed more than 100mm out of the collimator edge.\n[Conclusion] In order to estimate exposure dose for cone-beam CT such as 4D-CT, it should be recommended to measure integral dose over collimator width plus at least 200mm length.","subitem_description_type":"Abstract"}]},"item_10003_source_id_9":{"attribute_name":"ISSN","attribute_value_mlt":[{"subitem_source_identifier":"0277-786X","subitem_source_identifier_type":"ISSN"}]},"item_access_right":{"attribute_name":"アクセス権","attribute_value_mlt":[{"subitem_access_right":"metadata only access","subitem_access_right_uri":"http://purl.org/coar/access_right/c_14cb"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"Endo, Masahiro"}],"nameIdentifiers":[{"nameIdentifier":"544096","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Mori, Shinichirou"}],"nameIdentifiers":[{"nameIdentifier":"544097","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Tsunoo, Takanori"}],"nameIdentifiers":[{"nameIdentifier":"544098","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Nishizawa, Kanae"}],"nameIdentifiers":[{"nameIdentifier":"544099","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Aoyama, Takahiko"}],"nameIdentifiers":[{"nameIdentifier":"544100","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"遠藤 真広","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"544101","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"森 慎一郎","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"544102","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"角尾 卓紀","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"544103","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"西澤 かな枝","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"544104","nameIdentifierScheme":"WEKO"}]}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"eng"}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourcetype":"conference paper","resourceuri":"http://purl.org/coar/resource_type/c_5794"}]},"item_title":"Dose profile measurement of a four-dimensional CT (4D-CT)","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"Dose profile measurement of a four-dimensional CT (4D-CT)"}]},"item_type_id":"10003","owner":"1","path":["2"],"pubdate":{"attribute_name":"公開日","attribute_value":"2004-02-20"},"publish_date":"2004-02-20","publish_status":"0","recid":"53313","relation_version_is_last":true,"title":["Dose profile measurement of a four-dimensional CT (4D-CT)"],"weko_creator_id":"1","weko_shared_id":-1},"updated":"2023-05-15T23:14:03.522860+00:00"}