{"created":"2023-05-15T14:53:22.059189+00:00","id":72675,"links":{},"metadata":{"_buckets":{"deposit":"743b965a-6f99-460b-88bb-75d9348114b2"},"_deposit":{"created_by":1,"id":"72675","owners":[1],"pid":{"revision_id":0,"type":"depid","value":"72675"},"status":"published"},"_oai":{"id":"oai:repo.qst.go.jp:00072675","sets":["10:28"]},"author_link":["715759","715763","715766","715767","715770","715758","715765","715769","715762","715756","715764","715771","715760","715761","715757","715768"],"item_10005_date_7":{"attribute_name":"発表年月日","attribute_value_mlt":[{"subitem_date_issued_datetime":"2018-02-28","subitem_date_issued_type":"Issued"}]},"item_10005_description_5":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"Objectives: Brain PET imaging is frequently used in clinical practice and research. A high lesion detectability is required in neuro-oncology field because the brain tumor extent is clinically relevant. Therefore, we have developed a brain-dedicated high-resolution and high-sensitivity PET prototype. In this study, we evaluated the small lesion imaging performance of the brain PET prototype using a small sphere phantom. \nMaterials and methods: The helmet-neck PET is our original brain PET system, in which 47 four-layer depth-of-interaction detectors are used to form a hemisphere and 7 of them are placed on the neck part. The phantom had six small spheres (Inner diameters: 22, 17, 13, 10, 8, and 5 mm), which were filled with three times higher radioactivity concentration of the background. The background radioactivity was 1.32kBq/mL, which was generally half radioactivity level compared with clinical neuro-oncology PET. PET data were acquired for 20-min and were reconstructed with ordered-subsets expectation-maximization algorithm. The %contrast in each sphere and coefficient-of-variation on the background area (CVBG) were calculated to evaluate lesion detectability and image quality. \nResults: On the images reconstructed with 8-iterations and 8-subsets, the 8-mm-sphere was clearly observed. The %contrast of the 8-mm-sphere was 35.8% and the CVBG was 16.0%. The %contrast obviously achieved the criteria described by the previous report (%contrast >13%). \nConclusion: The novel helmet-neck PET showed great small lesion detectability even though the radioactivity level was a lower condition. Therefore, the helmet-neck PET has a potential to not only improve small lesion detectability but also reduce injection activity or scanning duration.","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":"ECR2018","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":"Akamatsu, Go"}],"nameIdentifiers":[{"nameIdentifier":"715756","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Tashima, Hideaki"}],"nameIdentifiers":[{"nameIdentifier":"715757","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Iwao, Yuma"}],"nameIdentifiers":[{"nameIdentifier":"715758","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Wakizaka, Hidekatsu"}],"nameIdentifiers":[{"nameIdentifier":"715759","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Maeda, Takamasa"}],"nameIdentifiers":[{"nameIdentifier":"715760","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Yoshida, Eiji"}],"nameIdentifiers":[{"nameIdentifier":"715761","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Yamashita, Taichi"}],"nameIdentifiers":[{"nameIdentifier":"715762","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Yamaya, Taiga"}],"nameIdentifiers":[{"nameIdentifier":"715763","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"赤松 剛","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"715764","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"田島 英朗","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"715765","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"岩男 悠真","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"715766","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"脇坂 秀克","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"715767","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"前田 貴雅","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"715768","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"吉田 英治","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"715769","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"山下 大地","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"715770","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"山谷 泰賀","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"715771","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":"Small lesion imaging performance of a novel helmet-neck PET prototype: a phantom study","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"Small lesion imaging performance of a novel helmet-neck PET prototype: a phantom study"}]},"item_type_id":"10005","owner":"1","path":["28"],"pubdate":{"attribute_name":"公開日","attribute_value":"2018-03-05"},"publish_date":"2018-03-05","publish_status":"0","recid":"72675","relation_version_is_last":true,"title":["Small lesion imaging performance of a novel helmet-neck PET prototype: a phantom study"],"weko_creator_id":"1","weko_shared_id":-1},"updated":"2023-05-15T19:37:17.211538+00:00"}