{"created":"2023-05-15T14:55:45.836474+00:00","id":75716,"links":{},"metadata":{"_buckets":{"deposit":"50d8122f-4b8d-41d7-940b-a7c47dece073"},"_deposit":{"created_by":1,"id":"75716","owners":[1],"pid":{"revision_id":0,"type":"depid","value":"75716"},"status":"published"},"_oai":{"id":"oai:repo.qst.go.jp:00075716","sets":["10:29"]},"author_link":["1019672","1019673","1019665","1019670","1019664","1019667","1019666","1019675","1019674","1019676","1019669","1019668","1019677","1019671"],"item_10005_date_7":{"attribute_name":"発表年月日","attribute_value_mlt":[{"subitem_date_issued_datetime":"2019-04-11","subitem_date_issued_type":"Issued"}]},"item_10005_description_5":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"[Purpose] We have proposed a new concept of whole gamma imaging (WGI), which is a novel combination of PET and Compton imaging, and we have showed by simulation the feasibility of triple-gamma imaging targeting β+-γ emitters, which emit both a positron and a gamma ray almost at the same time. In this study, we developed a proof-of-concept prototype of the WGI and an imaging method for the triple-gamma imaging incorporating resolution modeling.\n[Method] We developed a WGI prototype by inserting a scatterer detector ring (20 cm in inner diameter, 20x2 (transverse x axial) detectors each consisted of a 24x24x1 array of 0.9x0.9x6-mm3 GAGG crystals and a 8x8 array of 3-mm multipixel photon counters (MPPCs)) into a PET (absorber) detector ring (66 cm in inner diameter, 40x4 detectors each consisted of a 16x16x4 array of 2.8x2.8x7.5-mm3 Zr-doped GSO crystals and 64-ch photo multiplier tubes). In the triple-gamma imaging, radioactivity source position can be determined as the intersection point between a line-of-response (positron) and a Compton cone (gamma ray) in the field of view. The half-cone angle of the Compton cone is equal to the scatter angle determined by the Klein-Nishina equation using energy information. We derived an equation necessary to determine the intersection point and developed a method to model blurring effect of the cone due to the energy resolution of the detectors. To demonstrate the effectiveness of the triple-gamma imaging, we measured a 22Na point source, which emits a positron and a 1274 keV gamma ray, placed at various positions by using the WGI prototype.\n[Results] We compared triple-gamma images generated by back-projection using the proposed model and using only LOR information for the same list-mode data set. The proposed method could generate clearer image.\n[Conclusion] We demonstrated that the triple-gamma imaging is possible with the WGI prototype and the proposed method.","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":"第117回日本医学物理学会学術大会","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":"田島, 英朗"}],"nameIdentifiers":[{"nameIdentifier":"1019664","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"吉田, 英治"}],"nameIdentifiers":[{"nameIdentifier":"1019665","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"奥村, 勇介"}],"nameIdentifiers":[{"nameIdentifier":"1019666","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"菅, 幹生"}],"nameIdentifiers":[{"nameIdentifier":"1019667","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"河地, 有木"}],"nameIdentifiers":[{"nameIdentifier":"1019668","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Kamada, Kei"}],"nameIdentifiers":[{"nameIdentifier":"1019669","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Parodi, Katia"}],"nameIdentifiers":[{"nameIdentifier":"1019670","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"山谷, 泰賀"}],"nameIdentifiers":[{"nameIdentifier":"1019671","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Hideaki, Tashima","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"1019672","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Eiji, Yoshida","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"1019673","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Yusuke, Okumura","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"1019674","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Mikio, Suga","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"1019675","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Naoki, Kawachi","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"1019676","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Taiga, Yamaya","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"1019677","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":"Whole Gamma Imaging: demonstration of the β＋-γ coincidence","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"Whole Gamma Imaging: demonstration of the β＋-γ coincidence"}]},"item_type_id":"10005","owner":"1","path":["29"],"pubdate":{"attribute_name":"公開日","attribute_value":"2019-04-25"},"publish_date":"2019-04-25","publish_status":"0","recid":"75716","relation_version_is_last":true,"title":["Whole Gamma Imaging: demonstration of the β＋-γ coincidence"],"weko_creator_id":"1","weko_shared_id":-1},"updated":"2023-05-15T18:24:17.632444+00:00"}