{"_buckets": {"deposit": "b17d3e32-eb06-4fef-8072-52e6cede304c"}, "_deposit": {"created_by": 1, "id": "70965", "owners": [1], "pid": {"revision_id": 0, "type": "depid", "value": "70965"}, "status": "published"}, "_oai": {"id": "oai:repo.qst.go.jp:00070965", "sets": ["28"]}, "author_link": ["697426", "697431", "697452", "697448", "697449", "697435", "697450", "697454", "697433", "697447", "697429", "697439", "697444", "697445", "697442", "697432", "697443", "697437", "697453", "697446", "697430", "697434", "697425", "697438", "697436", "697440", "697427", "697441", "697428", "697451"], "item_10005_date_7": {"attribute_name": "発表年月日", "attribute_value_mlt": [{"subitem_date_issued_datetime": "2012-10-31", "subitem_date_issued_type": "Issued"}]}, "item_10005_description_5": {"attribute_name": "抄録", "attribute_value_mlt": [{"subitem_description": "Purpose\nImage reconstruction for most nuro-transmission PET scan data is performed by FBP because of a positive bias caused by the noise propagation in OS-EM algorithm. A positive bias affects the estimation of binding potential (BP) calculated from radioactive concentrations of reference regions and target region in nuroreceptor binding assay. To suppress the noise propagation in OS-EM algorithm, the hybrid wavelet shrinkage (HWS) filter is developed. In this study, we performed the phantom study to evaluate the effect of HWS filter on noise propagation in OS-EM algorithm.\n\\nMaterials and Methods\nPhantom studies are performed by SET-3000GCT/X (shimadzu corp). To evaluate the effect of the HWS filter, we planned the some phantom study. IEC body phantom filled with 18F (activity concentration ratios relative to background of 4:1) are used for evaluation of image quality. A pool phantom filled with 18F (11.4kBq/ml) is scanned by dynamic scan mode for evaluation the quantification of PET image. Prior to emission scans, a transmission scan (6min) for attenuation correction with a 137Cs point source with a BGO transmission detector ring coaxially attached to the GSO emission detector ring. Reconstruction parameters of PET images are follows; FBP with Gaussian filter 5.0mm, OS-EM, OS-EM with HWS filter (OS-EMw). Iteration numbers in OS-EM algorithm are varied from 1 to 100 to evaluate the noise propagation.\n\\nResults\nIn pool phantom study, a positive bias at low count rate is shown in PET images reconstructed by OS-EM algorithm, while any biases are not shown in images reconstructed by FBP and OS-EMw algorithm. The N10 values are diverged due to noise propagation in OS-EM algorithm while N10 values calculated from PET image reconstructed by OS-EMw algorithm are convergence at the point of 10 iterations in IEC body phantom study. Similarly, the Q10 values are diverged depends on iteration number in OS-EM algorithm while that of OS-EMw has fast convergence. Furthermore, these results indicate that OS-EMw has the fast convergence of pixel number and suppress the noise propagation.\n\\nConclusion\nAccording to our study, OS-EMw has fast convergence and suppresses the noise propagation in OS-EM algorithm. These results show that HWS filter can be a standard de-noising method for nuro-recptor PET imaging with OS-EM algorithm.", "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": "Annual Congress of the European Association of Nuclear Medicine", "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": "Shiraishi, Takahiro"}], "nameIdentifiers": [{"nameIdentifier": "697425", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "Kanno, Iwao"}], "nameIdentifiers": [{"nameIdentifier": "697426", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "Ito, Hiroshi"}], "nameIdentifiers": [{"nameIdentifier": "697427", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "Yoshikawa, Kyosan"}], "nameIdentifiers": [{"nameIdentifier": "697428", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "Tanimoto, Katsuyuki"}], "nameIdentifiers": [{"nameIdentifier": "697429", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "Ishii, Noriyuki"}], "nameIdentifiers": [{"nameIdentifier": "697430", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "Kimura, Taku"}], "nameIdentifiers": [{"nameIdentifier": "697431", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "Omatsu, Mika"}], "nameIdentifiers": [{"nameIdentifier": "697432", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "Ohashi, Seiya"}], "nameIdentifiers": [{"nameIdentifier": "697433", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "Toubaru, Sachiko"}], "nameIdentifiers": [{"nameIdentifier": "697434", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "Takano, Harumasa"}], "nameIdentifiers": [{"nameIdentifier": "697435", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "Tsuji, Hiroshi"}], "nameIdentifiers": [{"nameIdentifier": "697436", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "Ando, Yutaka"}], "nameIdentifiers": [{"nameIdentifier": "697437", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "Kamada, Tadashi"}], "nameIdentifiers": [{"nameIdentifier": "697438", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "Shibayama, Kouichi"}], "nameIdentifiers": [{"nameIdentifier": "697439", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "白石 貴博", "creatorNameLang": "en"}], "nameIdentifiers": [{"nameIdentifier": "697440", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "菅野 巖", "creatorNameLang": "en"}], "nameIdentifiers": [{"nameIdentifier": "697441", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "伊藤 浩", "creatorNameLang": "en"}], "nameIdentifiers": [{"nameIdentifier": "697442", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "吉川 京燦", "creatorNameLang": "en"}], "nameIdentifiers": [{"nameIdentifier": "697443", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "谷本 克之", "creatorNameLang": "en"}], "nameIdentifiers": [{"nameIdentifier": "697444", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "石井 徳幸", "creatorNameLang": "en"}], "nameIdentifiers": [{"nameIdentifier": "697445", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "木村 卓", "creatorNameLang": "en"}], "nameIdentifiers": [{"nameIdentifier": "697446", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "尾松 美香", "creatorNameLang": "en"}], "nameIdentifiers": [{"nameIdentifier": "697447", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "大橋 靖也", "creatorNameLang": "en"}], "nameIdentifiers": [{"nameIdentifier": "697448", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "桃原 幸子", "creatorNameLang": "en"}], "nameIdentifiers": [{"nameIdentifier": "697449", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "高野 晴成", "creatorNameLang": "en"}], "nameIdentifiers": [{"nameIdentifier": "697450", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "辻 比呂志", "creatorNameLang": "en"}], "nameIdentifiers": [{"nameIdentifier": "697451", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "安藤 裕", "creatorNameLang": "en"}], "nameIdentifiers": [{"nameIdentifier": "697452", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "鎌田 正", "creatorNameLang": "en"}], "nameIdentifiers": [{"nameIdentifier": "697453", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "柴山 晃一", "creatorNameLang": "en"}], "nameIdentifiers": [{"nameIdentifier": "697454", "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": "Hybrid wavelet shrinkage (HWS) filter suppress the noise propagation in ordered subset expectation maximization (OS-EM) algorithm", "item_titles": {"attribute_name": "タイトル", "attribute_value_mlt": [{"subitem_title": "Hybrid wavelet shrinkage (HWS) filter suppress the noise propagation in ordered subset expectation maximization (OS-EM) algorithm"}]}, "item_type_id": "10005", "owner": "1", "path": ["28"], "permalink_uri": "https://repo.qst.go.jp/records/70965", "pubdate": {"attribute_name": "公開日", "attribute_value": "2012-11-07"}, "publish_date": "2012-11-07", "publish_status": "0", "recid": "70965", "relation": {}, "relation_version_is_last": true, "title": ["Hybrid wavelet shrinkage (HWS) filter suppress the noise propagation in ordered subset expectation maximization (OS-EM) algorithm"], "weko_shared_id": -1}