WEKO3
アイテム
{"_buckets": {"deposit": "a375fdfc-c003-4769-a059-7d2c258b2b59"}, "_deposit": {"created_by": 1, "id": "46338", "owners": [1], "pid": {"revision_id": 0, "type": "depid", "value": "46338"}, "status": "published"}, "_oai": {"id": "oai:repo.qst.go.jp:00046338", "sets": ["1"]}, "author_link": ["461643", "461644", "461642", "461639", "461638", "461645", "461640", "461641"], "item_8_biblio_info_7": {"attribute_name": "書誌情報", "attribute_value_mlt": [{"bibliographicIssueDates": {"bibliographicIssueDate": "2012-02", "bibliographicIssueDateType": "Issued"}, "bibliographicIssueNumber": "1", "bibliographicPageEnd": "29", "bibliographicPageStart": "24", "bibliographicVolumeNumber": "59", "bibliographic_titles": [{"bibliographic_title": "IEEE Transactions on Nuclear Science"}]}]}, "item_8_description_5": {"attribute_name": "抄録", "attribute_value_mlt": [{"subitem_description": "Purpose: In the conventional techniques for determining the calibration factors of positron emission tomography (PET) scanners, cylindrical water and resin phantoms with radioisotope 18F or 68Ge/68Ga are used. In these methods, however, the results depend on attenuation and scatter correction. The purpose of this study is to develop a point-like 68Ge/68Ga radioactive source that can be used to determine the calibration factors of PET scanners without the uncertainty of attenuation and scatter correction. Methods: A spherical absorber design was employed to realize a symmetric angular distribution of emitted annihilation photons. A Geant4-based Monte Carlo simulation code was used to compare physics characteristics of point-like sources with various absorber materials. On the basis of this simulation, a point-like 68Ge/68Ga source with a spherical aluminum absorber was manufactured. Its radioactivity was calibrated at an accredited national calibration facility. A calibration factor of a clinical PET scanner was then obtained with a point-like source and compared with that obtained by a standard cross-calibration method. Results: The emission probability of 0.511 MeV annihilation photon pairs per positron decay was typically 0.6-0.8. The fraction of background photon pairs was 6-8% in the energy region of 0.4-0.6 MeV. Considering these two figures, lower density materials such as aluminum and pol(ymethyl methacrylate) (PMMA) were preferable. For the aluminum absorber, a diameter of 8 mm was suitable to prevent positrons from escaping. The calibration factor obtained with the point-like source agreed with that obtained by the standard method within 2-3%. Conclusion: A point-like 68Ge/68Ga radioactive source was successfully designed, manufactured, and used for determining a calibration factor of a PET scanner. It can be considered a practical tool for calibrating and ev- luating the quantitative aspects of PET scanners.", "subitem_description_type": "Abstract"}]}, "item_8_source_id_9": {"attribute_name": "ISSN", "attribute_value_mlt": [{"subitem_source_identifier": "0018-9499", "subitem_source_identifier_type": "ISSN"}]}, "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": "Hasegawa, Tomoyuki"}], "nameIdentifiers": [{"nameIdentifier": "461638", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "Oda, Keiichi"}], "nameIdentifiers": [{"nameIdentifier": "461639", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "Murayama, Hideo"}], "nameIdentifiers": [{"nameIdentifier": "461640", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "Takei, Hideyuki"}], "nameIdentifiers": [{"nameIdentifier": "461641", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "et.al"}], "nameIdentifiers": [{"nameIdentifier": "461642", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "長谷川 智之", "creatorNameLang": "en"}], "nameIdentifiers": [{"nameIdentifier": "461643", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "村山 秀雄", "creatorNameLang": "en"}], "nameIdentifiers": [{"nameIdentifier": "461644", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "武居 秀行", "creatorNameLang": "en"}], "nameIdentifiers": [{"nameIdentifier": "461645", "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": "journal article", "resourceuri": "http://purl.org/coar/resource_type/c_6501"}]}, "item_title": "Novel point-like Ge-68/Ga-68 radioactive source with spherical positron absorber", "item_titles": {"attribute_name": "タイトル", "attribute_value_mlt": [{"subitem_title": "Novel point-like Ge-68/Ga-68 radioactive source with spherical positron absorber"}]}, "item_type_id": "8", "owner": "1", "path": ["1"], "permalink_uri": "https://repo.qst.go.jp/records/46338", "pubdate": {"attribute_name": "公開日", "attribute_value": "2012-06-06"}, "publish_date": "2012-06-06", "publish_status": "0", "recid": "46338", "relation": {}, "relation_version_is_last": true, "title": ["Novel point-like Ge-68/Ga-68 radioactive source with spherical positron absorber"], "weko_shared_id": -1}
Novel point-like Ge-68/Ga-68 radioactive source with spherical positron absorber
https://repo.qst.go.jp/records/46338
https://repo.qst.go.jp/records/46338961e077a-efaa-4527-929a-76a2bc369018
Item type | 学術雑誌論文 / Journal Article(1) | |||||
---|---|---|---|---|---|---|
公開日 | 2012-06-06 | |||||
タイトル | ||||||
タイトル | Novel point-like Ge-68/Ga-68 radioactive source with spherical positron absorber | |||||
言語 | ||||||
言語 | eng | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
資源タイプ | journal article | |||||
アクセス権 | ||||||
アクセス権 | metadata only access | |||||
アクセス権URI | http://purl.org/coar/access_right/c_14cb | |||||
著者 |
Hasegawa, Tomoyuki
× Hasegawa, Tomoyuki× Oda, Keiichi× Murayama, Hideo× Takei, Hideyuki× et.al× 長谷川 智之× 村山 秀雄× 武居 秀行 |
|||||
抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | Purpose: In the conventional techniques for determining the calibration factors of positron emission tomography (PET) scanners, cylindrical water and resin phantoms with radioisotope 18F or 68Ge/68Ga are used. In these methods, however, the results depend on attenuation and scatter correction. The purpose of this study is to develop a point-like 68Ge/68Ga radioactive source that can be used to determine the calibration factors of PET scanners without the uncertainty of attenuation and scatter correction. Methods: A spherical absorber design was employed to realize a symmetric angular distribution of emitted annihilation photons. A Geant4-based Monte Carlo simulation code was used to compare physics characteristics of point-like sources with various absorber materials. On the basis of this simulation, a point-like 68Ge/68Ga source with a spherical aluminum absorber was manufactured. Its radioactivity was calibrated at an accredited national calibration facility. A calibration factor of a clinical PET scanner was then obtained with a point-like source and compared with that obtained by a standard cross-calibration method. Results: The emission probability of 0.511 MeV annihilation photon pairs per positron decay was typically 0.6-0.8. The fraction of background photon pairs was 6-8% in the energy region of 0.4-0.6 MeV. Considering these two figures, lower density materials such as aluminum and pol(ymethyl methacrylate) (PMMA) were preferable. For the aluminum absorber, a diameter of 8 mm was suitable to prevent positrons from escaping. The calibration factor obtained with the point-like source agreed with that obtained by the standard method within 2-3%. Conclusion: A point-like 68Ge/68Ga radioactive source was successfully designed, manufactured, and used for determining a calibration factor of a PET scanner. It can be considered a practical tool for calibrating and ev- luating the quantitative aspects of PET scanners. | |||||
書誌情報 |
IEEE Transactions on Nuclear Science 巻 59, 号 1, p. 24-29, 発行日 2012-02 |
|||||
ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 0018-9499 |