{"created":"2023-05-15T14:55:41.083639+00:00","id":75608,"links":{},"metadata":{"_buckets":{"deposit":"0d32073a-ab0c-4b66-b3f7-ecc2cd9c12f4"},"_deposit":{"created_by":1,"id":"75608","owners":[1],"pid":{"revision_id":0,"type":"depid","value":"75608"},"status":"published"},"_oai":{"id":"oai:repo.qst.go.jp:00075608","sets":["10:29"]},"author_link":["743557","743562","743556","743558","743564","743552","743555","743563","743560","743554","743553","743559","743551","743561"],"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】Brain PET imaging plays important roles in neurology, neuro-oncology and molecular imaging research. There is a potential demand for a brain PET scanner with high spatial resolution and high sensitivity to achieve more accurate brain imaging. Therefore, we are developing a brain-dedicated helmet-type PET scanner with 4-layer depth-of-interaction (DOI) detectors. In this study, we evaluated performance characteristics of the helmet-type PET prototype. \n\n【Method】The helmet-type PET prototype was composed of 54 detector blocks. The 47 detector blocks were arranged with a hemispherical helmet detector unit and the other 7 detector blocks were located at the neck position. The detector block itself was composed of 4-layer GSOZ crystals. We measured performance characteristics (spatial resolution, sensitivity, scatter fraction, count rate characteristics, accuracy of corrections for count losses and randoms, and image quality) of the helmet-type PET prototype based on the NEMA NU2-2018 standard. In addition to the original NEMA standard, some modified measurements were performed to predict performance of brain imaging. \n\n【Result】The helmet-type PET prototype showed great spatial resolution (1.6 mm at 1 cm offset, OSEM reconstruction), great sensitivity (32.7 kcps/MBq obtained by the modified setup) and promising image quality. With the original 70-cm-long scatter phantom, the scatter fraction, peak noise-equivalent count rate and maximum absolute bias were 37%, 34.9 kcps@4.0kBq/mL and 17.4%.\n\n【Conclusion】We confirmed the high performance of the helmet-type PET prototype. The helmet-type PET scanner has the high potential to achieve more accurate brain PET imaging, even with a small number of detectors.","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75回日本放射線技術学会総会学術大会","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":"赤松, 剛"}],"nameIdentifiers":[{"nameIdentifier":"743551","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"田島, 英朗"}],"nameIdentifiers":[{"nameIdentifier":"743552","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"吉田, 英治"}],"nameIdentifiers":[{"nameIdentifier":"743553","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"岩男, 悠真"}],"nameIdentifiers":[{"nameIdentifier":"743554","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"脇坂, 秀克"}],"nameIdentifiers":[{"nameIdentifier":"743555","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"前田, 貴雅"}],"nameIdentifiers":[{"nameIdentifier":"743556","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"山谷, 泰賀"}],"nameIdentifiers":[{"nameIdentifier":"743557","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Akamatsu, Go","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"743558","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Tashima, Hideaki","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"743559","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Yoshida, Eiji","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"743560","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Iwao, Yuma","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"743561","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Wakizaka, Hidekatsu","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"743562","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Maeda, Takamasa","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"743563","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Yamaya, Taiga","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"743564","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":"NEMA NU2 performance evaluation of a helmet-type PET prototype with four-layer DOI detectors","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"NEMA NU2 performance evaluation of a helmet-type PET prototype with four-layer DOI detectors"}]},"item_type_id":"10005","owner":"1","path":["29"],"pubdate":{"attribute_name":"公開日","attribute_value":"2019-04-15"},"publish_date":"2019-04-15","publish_status":"0","recid":"75608","relation_version_is_last":true,"title":["NEMA NU2 performance evaluation of a helmet-type PET prototype with four-layer DOI detectors"],"weko_creator_id":"1","weko_shared_id":-1},"updated":"2023-05-16T01:37:23.083406+00:00"}