{"created":"2023-05-15T14:34:52.236864+00:00","id":45084,"links":{},"metadata":{"_buckets":{"deposit":"f81c07ba-f8ed-46ff-93e9-1f0aeee18250"},"_deposit":{"created_by":1,"id":"45084","owners":[1],"pid":{"revision_id":0,"type":"depid","value":"45084"},"status":"published"},"_oai":{"id":"oai:repo.qst.go.jp:00045084","sets":["1"]},"author_link":["447661","447656","447668","447663","447670","447660","447665","447662","447672","447673","447667","447666","447671","447658","447659","447664","447657","447669"],"item_8_biblio_info_7":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"2008-01","bibliographicIssueDateType":"Issued"},"bibliographicIssueNumber":"3","bibliographicPageEnd":"773","bibliographicPageStart":"757","bibliographicVolumeNumber":"53","bibliographic_titles":[{"bibliographic_title":"Physics in Medicine and Biology"}]}]},"item_8_description_5":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"The long patient port of a PET scanner tends to put stress on patients, especially\npatients with claustrophobia. It also prevents doctors and technicians from\ntaking care of patients during scanning. In this paper, we proposed an 'open\nPET' geometry, which consists of two axially separated detector rings. A long\nand continuous field-of-view (FOV) including a 360 opened gap between two\ndetector rings can be imaged enabling a fully 3D image reconstruction of all\nthe possible lines-of-response. The open PET will become practical if iterative\nimage reconstruction methods are applied even though image reconstruction\nof the open PET is analytically an incomplete problem. First we implemented\na 'masked' 3D ordered subset expectation maximization (OS-EM) in which\nthe system matrix was obtained from a long 'gapless' scanner by applying a\nmask to detectors corresponding to the open space. Next, in order to evaluate\nimaging performance of the proposed open PET geometry, we simulated a dual\nHR+ scanner (ring diameter of D = 827 mm, axial length ofW = 154 mm * 2)\nseparated by a variable gap. The gapW was the maximum limit to have axially\ncontinuous FOV of 3W though the maximum diameter of FOV at the central\nslice was limited to D/2. Artifacts, observed on both sides of the open space\nwhen the gap exceeded W, were effectively reduced by inserting detectors\npartially into unnecessary open spaces. We also tested the open PET geometry\nusing experimental data obtained by the jPET-D4. The jPET-D4 is a prototype\nbrain scanner, which has 5 rings of 24 detector blocks. We simulated the open\njPET-D4 with a gap of 66 mm by eliminating 1 block-ring from experimental\ndata. Although some artifacts were seen at both ends of the opened gap, very\nsimilar images were obtained with and without the gap. The proposed open\nPET geometry is expected to lead to realization of in-beam PET, which is a\nmethod for an in situ monitoring of charged particle therapy, by letting the\nbeams pass through the gap. The proposed open PET geometry will also allow\nsimultaneous PET/CT measurements of the same PET FOV as the CT FOV, in\ncontrast to the conventional PET/CT where each FOV is separated by several\ntens of centimeters.","subitem_description_type":"Abstract"}]},"item_8_relation_14":{"attribute_name":"DOI","attribute_value_mlt":[{"subitem_relation_type_id":{"subitem_relation_type_id_text":"10.1088/0031-9155/53/3/015","subitem_relation_type_select":"DOI"}}]},"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":"Yamaya, Taiga"}],"nameIdentifiers":[{"nameIdentifier":"447656","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Inaniwa, Taku"}],"nameIdentifiers":[{"nameIdentifier":"447657","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Minohara, Shinichi"}],"nameIdentifiers":[{"nameIdentifier":"447658","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Yoshida, Eiji"}],"nameIdentifiers":[{"nameIdentifier":"447659","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Inadama, Naoko"}],"nameIdentifiers":[{"nameIdentifier":"447660","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Nishikido, Fumihiko"}],"nameIdentifiers":[{"nameIdentifier":"447661","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Shibuya, Kengo"}],"nameIdentifiers":[{"nameIdentifier":"447662","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Lam, ChihFung"}],"nameIdentifiers":[{"nameIdentifier":"447663","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Murayama, Hideo"}],"nameIdentifiers":[{"nameIdentifier":"447664","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"山谷 泰賀","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"447665","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"稲庭 拓","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"447666","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"蓑原 伸一","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"447667","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"吉田 英治","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"447668","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"稲玉 直子","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"447669","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"錦戸 文彦","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"447670","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"澁谷 憲悟","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"447671","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Ｌａｍ ＣｈｉｈＦｕｎｇ","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"447672","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"村山 秀雄","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"447673","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":"A proposal of an open PET geometry.","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"A proposal of an open PET geometry."}]},"item_type_id":"8","owner":"1","path":["1"],"pubdate":{"attribute_name":"公開日","attribute_value":"2008-01-24"},"publish_date":"2008-01-24","publish_status":"0","recid":"45084","relation_version_is_last":true,"title":["A proposal of an open PET geometry."],"weko_creator_id":"1","weko_shared_id":-1},"updated":"2023-05-16T00:07:53.399721+00:00"}