{"created":"2023-05-15T14:45:35.920725+00:00","id":62304,"links":{},"metadata":{"_buckets":{"deposit":"259721ee-abc7-4b49-a80d-e1fdfa260f84"},"_deposit":{"created_by":1,"id":"62304","owners":[1],"pid":{"revision_id":0,"type":"depid","value":"62304"},"status":"published"},"_oai":{"id":"oai:repo.qst.go.jp:00062304","sets":["10:29"]},"author_link":["615844","615839","615833","615837","615842","615840","615838","615845","615834","615847","615848","615850","615835","615841","615849","615836","615843","615846"],"item_10005_date_7":{"attribute_name":"発表年月日","attribute_value_mlt":[{"subitem_date_issued_datetime":"2007-11-06","subitem_date_issued_type":"Issued"}]},"item_10005_description_5":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"放医研では、産学協力体制のもと4層DOI検出器を世界に先駆けて開発し、頭部用装置jPET-D4を試作した。従来装置の約50倍の44億本にも達するLOR数は、DOI compression法によって1/16に削減されるが、それでも数日レベルの画像再構成時間を要していた。本研究では、計算時間の大部分を占めるシステムマトリクス計算について、事前計算法と再構成計算中に逐次計算するon-the-fly法の2つの方法から、それぞれjPET-D4画像再構成の高速化を試みた。前者では、ゼロ値要素の除去や装置対称性の活用により、140ペタバイトにも達するシステムマトリクスを25ギガバイト以下に圧縮した。後者では、システムモデルを単純化することで計算量を抑制した。そして、2CPU（dual-core 3.0GHz Xeon）を搭載したWSに両手法を実装したところ、どちらも約4時間の再構成計算時間で良好な画像が得られた。また、4ノード計算機を用いた並列計算化により、約1時間に短縮できる見通しを得た。","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47回日本核医学会学術総会","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":"山谷, 泰賀"}],"nameIdentifiers":[{"nameIdentifier":"615833","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Ｌａｍ, ＣｈｉｈＦｕｎｇ"}],"nameIdentifiers":[{"nameIdentifier":"615834","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"吉田, 英治"}],"nameIdentifiers":[{"nameIdentifier":"615835","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"稲玉, 直子"}],"nameIdentifiers":[{"nameIdentifier":"615836","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"錦戸, 文彦"}],"nameIdentifiers":[{"nameIdentifier":"615837","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"澁谷, 憲悟"}],"nameIdentifiers":[{"nameIdentifier":"615838","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"菅, 幹生"}],"nameIdentifiers":[{"nameIdentifier":"615839","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"小尾, 高史"}],"nameIdentifiers":[{"nameIdentifier":"615840","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"村山, 秀雄"}],"nameIdentifiers":[{"nameIdentifier":"615841","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"山谷 泰賀","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"615842","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Ｌａｍ ＣｈｉｈＦｕｎｇ","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"615843","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"吉田 英治","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"615844","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"稲玉 直子","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"615845","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"錦戸 文彦","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"615846","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"澁谷 憲悟","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"615847","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"菅 幹生","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"615848","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"小尾 高史","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"615849","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"村山 秀雄","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"615850","nameIdentifierScheme":"WEKO"}]}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"jpn"}]},"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":"頭部用試作機jPET-D4における画像再構成計算の高速化","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"頭部用試作機jPET-D4における画像再構成計算の高速化"}]},"item_type_id":"10005","owner":"1","path":["29"],"pubdate":{"attribute_name":"公開日","attribute_value":"2007-11-09"},"publish_date":"2007-11-09","publish_status":"0","recid":"62304","relation_version_is_last":true,"title":["頭部用試作機jPET-D4における画像再構成計算の高速化"],"weko_creator_id":"1","weko_shared_id":-1},"updated":"2023-05-15T21:32:17.901133+00:00"}