{"created":"2023-05-15T14:49:27.138015+00:00","id":67716,"links":{},"metadata":{"_buckets":{"deposit":"168e465a-6747-449e-a9a2-05693de14977"},"_deposit":{"created_by":1,"id":"67716","owners":[1],"pid":{"revision_id":0,"type":"depid","value":"67716"},"status":"published"},"_oai":{"id":"oai:repo.qst.go.jp:00067716","sets":["10:28"]},"author_link":["665477","665475","665479","665482","665474","665481","665478","665476","665480"],"item_10005_date_7":{"attribute_name":"発表年月日","attribute_value_mlt":[{"subitem_date_issued_datetime":"2004-02-19","subitem_date_issued_type":"Issued"}]},"item_10005_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_10005_description_6":{"attribute_name":"会議概要（会議名, 開催地, 会期, 主催者等）","attribute_value_mlt":[{"subitem_description":"SPIE medical imaging","subitem_description_type":"Other"}]},"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":"665474","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Mori, Shinichirou"}],"nameIdentifiers":[{"nameIdentifier":"665475","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Tsunoo, Takanori"}],"nameIdentifiers":[{"nameIdentifier":"665476","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Nishizawa, Kanae"}],"nameIdentifiers":[{"nameIdentifier":"665477","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Aoyama, Takahiko"}],"nameIdentifiers":[{"nameIdentifier":"665478","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"遠藤 真広","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"665479","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"森 慎一郎","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"665480","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"角尾 卓紀","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"665481","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"西澤 かな枝","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"665482","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 object","resourceuri":"http://purl.org/coar/resource_type/c_c94f"}]},"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":"10005","owner":"1","path":["28"],"pubdate":{"attribute_name":"公開日","attribute_value":"2004-02-20"},"publish_date":"2004-02-20","publish_status":"0","recid":"67716","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":"2023-05-15T20:34:31.899336+00:00"}