{"created":"2023-05-15T14:55:41.658922+00:00","id":75621,"links":{},"metadata":{"_buckets":{"deposit":"1978b039-4af7-4fea-af45-4a5317921826"},"_deposit":{"created_by":1,"id":"75621","owners":[1],"pid":{"revision_id":0,"type":"depid","value":"75621"},"status":"published"},"_oai":{"id":"oai:repo.qst.go.jp:00075621","sets":["10:29"]},"author_link":["744092","744091"],"item_10005_date_7":{"attribute_name":"発表年月日","attribute_value_mlt":[{"subitem_date_issued_datetime":"2019-04-12","subitem_date_issued_type":"Issued"}]},"item_10005_description_5":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"[Purpose] Carbon ion (C-ion) radiotherapy is better than the external photon radiotherapy because of C-ion’s higher concentration of dose and greater biological effects on the peripheral area of Bragg peak. The scanning method can realize the ideal shape of dose distribution for a coverage of target. It is important for passive method with a broad-beam to consider the radiation quality only along with depth for relative biological effectiveness (RBE). However, the lateral distribution of C-ion beam’s radiation quality must be considered for using scanning irradiation to confirm the uniformity of biological dose. In this study, the lateral radiation quality of C-ion beams is shown with the empirical model for biological dose estimation. \n[Method] The lateral dose, dose-averaged LET- (LETd) and RBE-distribution for of monochrome C-ion pencil beam with three incident kinetic energy (230, 290, 350 MeV/u) were derived with Monte Carlo tool Geant4.10.01.p03, respectively. The RBE as a biological index was calculated with a mixed-beam model, which is an empirical model developed by NIRS.\n[Results] The more the kinetic energy increases, the more dose distribution of primary C-ion beam spread from 10 mm to 16 mm in Bragg peak area, which looks like three-Gaussian. While the shape of RBE-distribution is similar to dose one, LETd distribution looks like a shape of well, which has a peak region at around 5 to 10 mm of radius. \n[Discussion] The C-ion has known as a high-LET particle around Bragg peak, it’s especially about beam’s depth direction. Although the lateral distribution had been not known well, the LETd distribution became obvious as a well-shape distribution in this study. The lateral radiation quality is critical for a spot scanning method because the biological dose distribution must be conformed three-dimensionally about a number of spot, which is not like broad-beam method. \n[Conclusion] We showed the lateral distributions of C-ion beams. These results may help you get the knowledge to understand the biological effects of spot scanning method.\n","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":"117th Scientific Meeting of JSMP","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":"中路, 拓"}],"nameIdentifiers":[{"nameIdentifier":"744091","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Nakaji, Taku","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"744092","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":"The Monte Carlo simulation for lateral radiation quality of carbon ion beam with the empirical model","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"The Monte Carlo simulation for lateral radiation quality of carbon ion beam with the empirical model"}]},"item_type_id":"10005","owner":"1","path":["29"],"pubdate":{"attribute_name":"公開日","attribute_value":"2019-04-17"},"publish_date":"2019-04-17","publish_status":"0","recid":"75621","relation_version_is_last":true,"title":["The Monte Carlo simulation for lateral radiation quality of carbon ion beam with the empirical model"],"weko_creator_id":"1","weko_shared_id":-1},"updated":"2023-05-16T01:31:57.910386+00:00"}