{"created":"2023-05-15T14:37:32.795352+00:00","id":48432,"links":{},"metadata":{"_buckets":{"deposit":"a9a1fc59-c9d1-499c-8259-653fa5438be9"},"_deposit":{"created_by":1,"id":"48432","owners":[1],"pid":{"revision_id":0,"type":"depid","value":"48432"},"status":"published"},"_oai":{"id":"oai:repo.qst.go.jp:00048432","sets":["1"]},"author_link":["486847","486846","486848","486844","486845","486842","486850","486852","486853","486851","486849","486843","486841"],"item_8_biblio_info_7":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"2009-05","bibliographicIssueDateType":"Issued"},"bibliographicIssueNumber":"10","bibliographicPageEnd":"3246","bibliographicPageStart":"3231","bibliographicVolumeNumber":"54","bibliographic_titles":[{"bibliographic_title":"Physics in Medicine and Biology"}]}]},"item_8_description_5":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"Purpose: When CT data with a thick slice thickness are used in treatment planning, geometrical uncertainty may induce dosimetric errors. We evaluated carbon ion dose variations due to different CT slice thicknesses using a four-dimensional (4D) carbon ion beam dose calculation, and compared results between ungated and gated respiratory strategies.\nMaterial and Methods: Seven lung patients were scanned in 4D mode with a 0.5-mm slice thickness using a 256-multi-slice CT scanner. CT images were averaged with various numbers of images to simulate reconstructed images with various slice thicknesses (0.5 mm-5.0 mm). Two scenarios were studied (respiratory-ungated and -gated strategies). Range compensators were designed for each of the CT volumes with coarse inter-slice spacing to cover the internal target volume (ITV), as defined from 4DCT. Carbon ion dose distribution was computed for each resulting ITV on the 0.5-mm slice 4DCT data. The accumulated dose distribution was then calculated using deformable registration for 4D dose assessment.\nResults: The magnitude of over- and under-dosage was found to be larger with the use of range compensators designed with a coarser inter-slice spacing than those obtained with a 0.5-mm slice thickness. Although no under dosage was observed within the clinical target volume (CTV) region, D95 remained at over 97% of the prescribed dose for the ungated strategy and 95% for the gated strategy for all slice thickness. Inter-slice spacing of less than 3 mm may be able minimize dose variation between the ungated and gated strategies.\nConclusions: Although volumes with increased inter-slice spacing may reduce geometrical accuracy at a certain respiratory phase, this does not significantly affect delivery of the accumulated dose to the target during the treatment course.","subitem_description_type":"Abstract"}]},"item_8_source_id_9":{"attribute_name":"ISSN","attribute_value_mlt":[{"subitem_source_identifier":"0031-9155","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":"Kumagai, Motoki"}],"nameIdentifiers":[{"nameIdentifier":"486841","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Mori, Shinichiro"}],"nameIdentifiers":[{"nameIdentifier":"486842","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Gregory, Sharp"}],"nameIdentifiers":[{"nameIdentifier":"486843","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Asakura, Hiroshi"}],"nameIdentifiers":[{"nameIdentifier":"486844","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Kandatsu, Susumu"}],"nameIdentifiers":[{"nameIdentifier":"486845","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Endo, Masahiro"}],"nameIdentifiers":[{"nameIdentifier":"486846","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Baba, Masayuki"}],"nameIdentifiers":[{"nameIdentifier":"486847","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"熊谷 始紀","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"486848","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"森 慎一郎","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"486849","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"浅倉 裕史","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"486850","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"神立 進","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"486851","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"遠藤 真広","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"486852","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"馬場 雅行","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"486853","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":"journal article","resourceuri":"http://purl.org/coar/resource_type/c_6501"}]},"item_title":"Dosimetric Variation Due to CT Inter-Slice Spacing in Four-Dimensional Carbon Beam Lung Therapy","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"Dosimetric Variation Due to CT Inter-Slice Spacing in Four-Dimensional Carbon Beam Lung Therapy"}]},"item_type_id":"8","owner":"1","path":["1"],"pubdate":{"attribute_name":"公開日","attribute_value":"2018-01-11"},"publish_date":"2018-01-11","publish_status":"0","recid":"48432","relation_version_is_last":true,"title":["Dosimetric Variation Due to CT Inter-Slice Spacing in Four-Dimensional Carbon Beam Lung Therapy"],"weko_creator_id":"1","weko_shared_id":-1},"updated":"2023-05-15T23:28:10.265171+00:00"}