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The general detector structure has\na scintillation crystal element array coupled on an array of\nthe large anode PMTs, and for crystal element identification,\nthe method is needed to get sufficient spread of scintillation\nlight for distribution among distant PMT anodes. Besides the\ncommon method of using a light guide, some methods have been\nproposed for better element identification performance. In this\npaper, we introduce a new method, in which the scintillation\nlight spread is promoted not only by removing reflectors between\ncrystal elements but also by restricting light exit to the PMTs\nby placing additional reflectors at the bottom of the crystal\nelement array. Because the additional reflectors are parallel to\nthe PMT surface, we call them parallel reflectors. We verified\nour method with a detector consisting of the 2.45 mm × 5 mm\n× 15 mm Lu2xGd2(1−x)SiO5:Ce crystal elements and two dualphotocathode\nPMTs. Each photocathode was 8 mm × 18 mm in\nsize. We set a 9×10 crystal element array on the two PMTs and\ntried to identify the elements by the 2×2 PMT signals. Detector\nperformance was evaluated with 137Cs point sources (662-keV\ngamma rays). The results showed that despite a significant\ndecrease in light output at the boundary of the two PMTs,\nthe method made crystal element identification possible. We measured\nenergy resolutions of 13.1% and 17.8% for the elements on\nthe PMT photocathode area and the PMT boundary, respectively.\nOur method is applicable to the depth-of-interaction detector\nconsisting of multilayer crystal element arrays. By inserting\nparallel reflectors between the layers, we would be able to control\nthe path of scintillation light originating in the upper layer. The\neffect was first examined in a basic study with two layers of a 2×5\ncrystal element array. Then, the array of each layer was increased\nto 9×9 for performance evaluation. It was difficult to identify all\n162 crystal elements with four PMT signals; however, results suggest\nthe possibility of scintillation light path control in each layer\nseparately by the parallel reflectors and the potential for better\nperformance by more precise adjustment of parallel reflectors.", "subitem_description_type": "Abstract"}]}, "item_8_publisher_8": {"attribute_name": "出版者", "attribute_value_mlt": [{"subitem_publisher": "IEEE"}]}, "item_8_relation_14": {"attribute_name": "DOI", "attribute_value_mlt": [{"subitem_relation_type_id": {"subitem_relation_type_id_text": "10.1109/TNS.2018.2881472", "subitem_relation_type_select": "DOI"}}]}, "item_8_relation_17": {"attribute_name": "関連サイト", "attribute_value_mlt": [{"subitem_relation_type_id": {"subitem_relation_type_id_text": "https://ieeexplore.ieee.org/document/8536403", "subitem_relation_type_select": "URI"}}]}, "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": "Inadama, Naoko"}], "nameIdentifiers": [{"nameIdentifier": "797674", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "Murayama, Hideo"}], "nameIdentifiers": [{"nameIdentifier": "797675", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "Nishikido, Fumihiko"}], "nameIdentifiers": [{"nameIdentifier": "797676", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "Ohi, Junichi"}], "nameIdentifiers": [{"nameIdentifier": "797677", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "Yamaya, Taiga"}], "nameIdentifiers": [{"nameIdentifier": "797678", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "Inadama, Naoko", "creatorNameLang": "en"}], "nameIdentifiers": [{"nameIdentifier": "797679", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "Murayama, Hideo", "creatorNameLang": "en"}], "nameIdentifiers": [{"nameIdentifier": "797680", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "Nishikido, Fumihiko", "creatorNameLang": "en"}], "nameIdentifiers": [{"nameIdentifier": "797681", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "Yamaya, Taiga", "creatorNameLang": "en"}], "nameIdentifiers": [{"nameIdentifier": "797682", "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": "Improvement of a PET Detector Performance by Setting Reflectors in Parallel With PMT Face", "item_titles": {"attribute_name": "タイトル", "attribute_value_mlt": [{"subitem_title": "Improvement of a PET Detector Performance by Setting Reflectors in Parallel With PMT Face"}]}, "item_type_id": "8", "owner": "1", "path": ["1"], "permalink_uri": "https://repo.qst.go.jp/records/49503", "pubdate": {"attribute_name": "公開日", "attribute_value": "2019-01-23"}, "publish_date": "2019-01-23", "publish_status": "0", "recid": "49503", "relation": {}, "relation_version_is_last": true, "title": ["Improvement of a PET Detector Performance by Setting Reflectors in Parallel With PMT Face"], "weko_shared_id": -1}
Improvement of a PET Detector Performance by Setting Reflectors in Parallel With PMT Face
https://repo.qst.go.jp/records/49503
https://repo.qst.go.jp/records/495036838edd8-065f-4847-b303-d39bb4b526e3
Item type | 学術雑誌論文 / Journal Article(1) | |||||
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公開日 | 2019-01-23 | |||||
タイトル | ||||||
タイトル | Improvement of a PET Detector Performance by Setting Reflectors in Parallel With PMT Face | |||||
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 |
Inadama, Naoko
× Inadama, Naoko× Murayama, Hideo× Nishikido, Fumihiko× Ohi, Junichi× Yamaya, Taiga× Inadama, Naoko× Murayama, Hideo× Nishikido, Fumihiko× Yamaya, Taiga |
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抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | A whole-body positron emission tomography scanner must be equipped with many detectors so that they are often composed of low-cost photomultiplier tubes (PMTs), that is, large anode-type PMTs. The general detector structure has a scintillation crystal element array coupled on an array of the large anode PMTs, and for crystal element identification, the method is needed to get sufficient spread of scintillation light for distribution among distant PMT anodes. Besides the common method of using a light guide, some methods have been proposed for better element identification performance. In this paper, we introduce a new method, in which the scintillation light spread is promoted not only by removing reflectors between crystal elements but also by restricting light exit to the PMTs by placing additional reflectors at the bottom of the crystal element array. Because the additional reflectors are parallel to the PMT surface, we call them parallel reflectors. We verified our method with a detector consisting of the 2.45 mm × 5 mm × 15 mm Lu2xGd2(1−x)SiO5:Ce crystal elements and two dualphotocathode PMTs. Each photocathode was 8 mm × 18 mm in size. We set a 9×10 crystal element array on the two PMTs and tried to identify the elements by the 2×2 PMT signals. Detector performance was evaluated with 137Cs point sources (662-keV gamma rays). The results showed that despite a significant decrease in light output at the boundary of the two PMTs, the method made crystal element identification possible. We measured energy resolutions of 13.1% and 17.8% for the elements on the PMT photocathode area and the PMT boundary, respectively. Our method is applicable to the depth-of-interaction detector consisting of multilayer crystal element arrays. By inserting parallel reflectors between the layers, we would be able to control the path of scintillation light originating in the upper layer. The effect was first examined in a basic study with two layers of a 2×5 crystal element array. Then, the array of each layer was increased to 9×9 for performance evaluation. It was difficult to identify all 162 crystal elements with four PMT signals; however, results suggest the possibility of scintillation light path control in each layer separately by the parallel reflectors and the potential for better performance by more precise adjustment of parallel reflectors. |
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書誌情報 |
IEEE TRANSACTIONS ON NUCLEAR SCIENCE 巻 66, 号 1, p. 497-505, 発行日 2019-01 |
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出版者 | ||||||
出版者 | IEEE | |||||
ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 0018-9499 | |||||
DOI | ||||||
識別子タイプ | DOI | |||||
関連識別子 | 10.1109/TNS.2018.2881472 | |||||
関連サイト | ||||||
識別子タイプ | URI | |||||
関連識別子 | https://ieeexplore.ieee.org/document/8536403 |