{"_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": ["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 \u003e13%). \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"], "permalink_uri": "https://repo.qst.go.jp/records/72675", "pubdate": {"attribute_name": "公開日", "attribute_value": "2018-03-05"}, "publish_date": "2018-03-05", "publish_status": "0", "recid": "72675", "relation": {}, "relation_version_is_last": true, "title": ["Small lesion imaging performance of a novel helmet-neck PET prototype: a phantom study"], "weko_shared_id": -1}