{"created":"2023-05-15T14:48:47.618758+00:00","id":66838,"links":{},"metadata":{"_buckets":{"deposit":"d1d3b3a0-3bd2-4725-886f-906152c5ad16"},"_deposit":{"created_by":1,"id":"66838","owners":[1],"pid":{"revision_id":0,"type":"depid","value":"66838"},"status":"published"},"_oai":{"id":"oai:repo.qst.go.jp:00066838","sets":["10:29"]},"author_link":["657155","657156","657168","657163","657162","657161","657165","657157","657164","657160","657159","657154","657153","657158","657166","657167"],"item_10005_date_7":{"attribute_name":"発表年月日","attribute_value_mlt":[{"subitem_date_issued_datetime":"2018-06-26","subitem_date_issued_type":"Issued"}]},"item_10005_description_5":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"Purpose: Brain PET imaging is useful for clinical practice and molecular imaging research. High-resolution and high-sensitivity PET systems are highly required for accurate brain functional imaging. Therefore, we have developed a brain-dedicated PET prototype, in which depth-of-interaction (DOI) detectors are arranged to form a hemisphere. On the other hand, some of standardized performance evaluation methods, which are originally proposed for whole-body PET systems, may not be suitable for a next-generation hemispherical brain PET system. Therefore, in this paper, we extended conventional performance evaluation methods so as to be applied to a hemispherical brain PET system. \n\\nMaterials and Methods: The NEMA NU-2 performance evaluation protocol was applied to the prototype, but the NEMA image quality phantom did not fit the prototype. In addition, the Hoffman 3-dimensional brain phantom, which is often used for imaging performance evaluation, did not fit the hemispherical detector arrangement. Therefore, we made a small image quality phantom and a hemispherical Hoffman phantom based on the original phantoms so as not to largely change activity distribution. Then, we experimentally evaluated imaging performance of the prototype, which had 54 four-layer DOI detectors (47 detectors for the hemisphere and the other 7 detectors placed at the back of the neck). We evaluated image quality using our developed small image quality phantom (Six spheres inner diameters: 22, 17, 13, 10, 8 and 5 mm) and hemispherical Hoffman brain phantom. The hot-sphere-to-background activity ratio was 3 which simulating brain tumor PET imaging. We then measured hot-sphere-to-background percent contrast (%contrast) and evaluated gray-to-white matter contrast in comparison with the digital Hoffman phantom. \n\\nResults: The NEMA NU-2 performance evaluation protocol was partially and successfully modified to the prototype. The %contrast of the 8-mm-sphere was 46.9%. The gray-to-white matter contrast was visually better than that of the digital phantom smoothed with 8-mm FWHM Gaussian filter, which has been often used as a reference resolution image.\n\\nConclusion: Standardized performance evaluation methods were successfully extended to hemispherical brain PET scanners by using our newly developed phantoms. We confirmed high imaging performance of our brain PET system. ","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":"米国核医学会（SNMMI）","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":"赤松, 剛"}],"nameIdentifiers":[{"nameIdentifier":"657153","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"田島, 英朗"}],"nameIdentifiers":[{"nameIdentifier":"657154","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"岩男, 悠真"}],"nameIdentifiers":[{"nameIdentifier":"657155","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"脇坂, 秀克"}],"nameIdentifiers":[{"nameIdentifier":"657156","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"前田, 貴雅"}],"nameIdentifiers":[{"nameIdentifier":"657157","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"吉田, 英治"}],"nameIdentifiers":[{"nameIdentifier":"657158","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"山下, 大地"}],"nameIdentifiers":[{"nameIdentifier":"657159","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"山谷, 泰賀"}],"nameIdentifiers":[{"nameIdentifier":"657160","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"赤松 剛","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"657161","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"田島 英朗","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"657162","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"岩男 悠真","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"657163","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"脇坂 秀克","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"657164","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"前田 貴雅","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"657165","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"吉田 英治","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"657166","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"山下 大地","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"657167","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"山谷 泰賀","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"657168","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":"Standardized performance evaluation of a brain-dedicated PET scanner with hemispherical detector arrangement","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"Standardized performance evaluation of a brain-dedicated PET scanner with hemispherical detector arrangement"}]},"item_type_id":"10005","owner":"1","path":["29"],"pubdate":{"attribute_name":"公開日","attribute_value":"2018-07-03"},"publish_date":"2018-07-03","publish_status":"0","recid":"66838","relation_version_is_last":true,"title":["Standardized performance evaluation of a brain-dedicated PET scanner with hemispherical detector arrangement"],"weko_creator_id":"1","weko_shared_id":-1},"updated":"2023-05-15T20:44:20.022875+00:00"}