{"created":"2023-05-15T14:51:04.474193+00:00","id":69819,"links":{},"metadata":{"_buckets":{"deposit":"033fe789-afe0-4017-b79d-d65900a5faef"},"_deposit":{"created_by":1,"id":"69819","owners":[1],"pid":{"revision_id":0,"type":"depid","value":"69819"},"status":"published"},"_oai":{"id":"oai:repo.qst.go.jp:00069819","sets":["10:28"]},"author_link":["685525","685526","685524","685527","685528","685523","685529","685530"],"item_10005_date_7":{"attribute_name":"発表年月日","attribute_value_mlt":[{"subitem_date_issued_datetime":"2009-07-30","subitem_date_issued_type":"Issued"}]},"item_10005_description_5":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"Purpose: To develop an algorithm to resolve intrinsic problems with dose calculations using pencil beams when particles involved in each beam are overreaching a lateral density interface or when they are detouring in a laterally heterogeneous medium. Method and Materials: A finding on a Gaussian distribution, such that it can be approximately decomposed into multiple narrower, shifted, and scaled ones, was applied to dynamic splitting of pencil beams implemented in a dose calculation algorithm for proton and ion beams. The method was tested in an experiment with a range-compensated carbon-ion beam. Its effectiveness and efficiency were evaluated for carbon-ion and proton beams in a heterogeneous phantom model. Results: The splitting dose calculation reproduced the detour effect observed in the experiment, which amounted to about 10% at a maximum or as large as the lateral particle-disequilibrium effect. The proton-beam dose generally showed large scattering effects including the overreach and detour effects. The overall computational times were 9 s and 45 s for non-splitting and splitting carbon-ion beams and 15 s and 66 s for non-splitting and splitting proton beams. Conclusions: The beam-splitting method was developed and verified to resolve the intrinsic size limitation of the Gaussian pencil-beam model in dose calculation algorithms. The computational speed slowed down by factor of 5, which would be tolerable for dose accuracy improvement at a maximum of 10%, in our test case.","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":"AAPM Annual Meeting 2009","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":"Kanematsu, Nobuyuki"}],"nameIdentifiers":[{"nameIdentifier":"685523","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Komori, Masataka"}],"nameIdentifiers":[{"nameIdentifier":"685524","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Yonai, Shunsuke"}],"nameIdentifiers":[{"nameIdentifier":"685525","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Ishizaki, Azusa"}],"nameIdentifiers":[{"nameIdentifier":"685526","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"兼松 伸幸","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"685527","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"小森 雅孝","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"685528","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"米内 俊祐","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"685529","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"石崎 梓","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"685530","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":"Dynamic splitting of Gaussian pencil beams in heterogeneity-correction algorithms for radiotherapy with heavy charged particles","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"Dynamic splitting of Gaussian pencil beams in heterogeneity-correction algorithms for radiotherapy with heavy charged particles"}]},"item_type_id":"10005","owner":"1","path":["28"],"pubdate":{"attribute_name":"公開日","attribute_value":"2009-08-02"},"publish_date":"2009-08-02","publish_status":"0","recid":"69819","relation_version_is_last":true,"title":["Dynamic splitting of Gaussian pencil beams in heterogeneity-correction algorithms for radiotherapy with heavy charged particles"],"weko_creator_id":"1","weko_shared_id":-1},"updated":"2023-05-15T20:10:03.865871+00:00"}