{"created":"2023-05-15T09:17:35.488780+00:00","id":436,"links":{},"metadata":{"_buckets":{"deposit":"1571f969-5125-49a5-9797-bf6705d99be7"},"_deposit":{"created_by":15,"id":"436","owners":[15],"pid":{"revision_id":0,"type":"depid","value":"436"},"status":"published"},"_oai":{"id":"oai:iuhw.repo.nii.ac.jp:00000436","sets":["2:103"]},"author_link":["1206","1150","237","1205","1207","1149"],"item_10001_biblio_info_7":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"2013-10-31","bibliographicIssueDateType":"Issued"},"bibliographicIssueNumber":"2","bibliographicPageEnd":"76","bibliographicPageStart":"68","bibliographicVolumeNumber":"18","bibliographic_titles":[{"bibliographic_title":"国際医療福祉大学学会誌"},{"bibliographic_title":"Journal of the International University of Health and Welfare","bibliographic_titleLang":"en"}]}]},"item_10001_description_5":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"We investigated the influence of the imaging method, heterogeneity of tissues in the region of interest (ROI), and motion artifacts on the signal-to-noise ratio (SNR) of brain images obtained by MRI using the identical ROI and subtraction methods. We used 2D FE, T1-weighted 2D SE, T2-weighted 2D FSE, and 3D FE as the imaging methods, and we measured SNR by setting a total of 16 ROIs in the white matter area located in the right and left frontal lobes, basal ganglia, and occipital lobe of each image. The influence of motion artifacts was investigated by comparing the standard deviation of ROIs set in the no-signal region in the frequency-encoding direction with those in the phase-encoding direction. As a result, it became clear that the influence of motion artifacts and heterogeneity on measured SNR values increased as SNR increased with an increase in the number of excitations and that the extent of influence varied depending on the imaging methods. In particular, it should be noticed that even if the number of excitations is increased to obtain an image with high SNR in the 2D FSE and 3D FE imaging methods, the expected image quality may not be obtained because the influence of motion artifacts increases.","subitem_description_type":"Abstract"}]},"item_10001_description_6":{"attribute_name":"内容記述","attribute_value_mlt":[{"subitem_description":"MRI頭部臨床画像を対象に,同一ROI法と差分法によるSNR測定において,撮像法やROI内組織の不均一性およびモーションアーチファクトがSNR測定値に与える影響について検討した.撮像法としては2DFE法,T1強調2DSE法,T2強調2DFSE法,および3DFE法を取り上げ,各撮像画像の白質領域内の前頭葉,基底核,後頭葉に左右計16個のROIを設置しSNRを測定した.また,位相エンコード方向と周波数エンコード方向の無信号領域に設定したROIの標準偏差を比較することでモーションアーチファクトの影響の検討を行った.その結果,SNRの計測値への不均一性,モーションアーチファクトの影響は,加算回数の増加によってSNRが大きくなるほど大きくなること,および,影響の大きさは撮像法によって異なることが明らかになった.特に,2DFSEおよび3DFEでは,SNRの高い画像を得るために加算回数を増加しても,モーションアーチファクトの影響が大きくなり,期待されるほど良い画質が得られないので注意が必要である.","subitem_description_type":"Other"}]},"item_10001_full_name_3":{"attribute_name":"著者別名","attribute_value_mlt":[{"nameIdentifiers":[{}],"names":[{"name":"Sato, Yoshiomi"}]},{"nameIdentifiers":[{}],"names":[{"name":"Fujita, Isao"}]},{"nameIdentifiers":[{}],"names":[{"name":"Sasaki, Hiroshi"}]}]},"item_10001_publisher_8":{"attribute_name":"出版者","attribute_value_mlt":[{"subitem_publisher":"国際医療福祉大学学会"}]},"item_10001_radio_20":{"attribute_name":"著者版フラグ","attribute_value_mlt":[{"subitem_radio_item":"publisher"}]},"item_10001_relation_12":{"attribute_name":"NII論文ID（NAID）","attribute_value_mlt":[{"subitem_relation_name":[{"subitem_relation_name_text":"110009625593"}]}]},"item_10001_relation_17":{"attribute_name":"関連サイト","attribute_value_mlt":[{"subitem_relation_name":[{"subitem_relation_name_text":"CiNii"}],"subitem_relation_type_id":{"subitem_relation_type_id_text":"http://ci.nii.ac.jp/naid/110009625593","subitem_relation_type_select":"URI"}}]},"item_10001_source_id_11":{"attribute_name":"書誌レコードID（NCID）","attribute_value_mlt":[{"subitem_source_identifier":"AA12537130","subitem_source_identifier_type":"NCID"}]},"item_10001_source_id_9":{"attribute_name":"ISSN","attribute_value_mlt":[{"subitem_source_identifier":"21863652","subitem_source_identifier_type":"ISSN"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"佐藤, 吉海"},{"creatorName":"サトウ, ヨシオミ","creatorNameLang":"ja-Kana"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"藤田, 功"},{"creatorName":"フジタ, イサオ","creatorNameLang":"ja-Kana"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"佐々木, 博"},{"creatorName":"ササキ, ヒロシ","creatorNameLang":"ja-Kana"}],"nameIdentifiers":[{}]}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2013-12-03"}],"displaytype":"simple","filename":"18_2(68-76p).pdf","filesize":[{"value":"871.1 kB"}],"format":"application/pdf","licensetype":"license_11","mimetype":"application/pdf","url":{"label":"本文(PDF)","url":"https://iuhw.repo.nii.ac.jp/record/436/files/18_2(68-76p).pdf"},"version_id":"23929ff2-59db-473e-9ab4-157a6c12bf24"}]},"item_keyword":{"attribute_name":"キーワード","attribute_value_mlt":[{"subitem_subject":"信号雑音比","subitem_subject_scheme":"Other"},{"subitem_subject":"白質","subitem_subject_scheme":"Other"},{"subitem_subject":"差分法","subitem_subject_scheme":"Other"},{"subitem_subject":"同一関心領域法","subitem_subject_scheme":"Other"},{"subitem_subject":"SNR","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"White Matter","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"Subtraction Method","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"Identical Region of Interest (ROI) Method","subitem_subject_language":"en","subitem_subject_scheme":"Other"}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"jpn"}]},"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":"MRI頭部臨床画像におけるSNR測定の検討-計測値への不均一性とモーションアーチファクトおよび撮影法の影響-","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"MRI頭部臨床画像におけるSNR測定の検討-計測値への不均一性とモーションアーチファクトおよび撮影法の影響-"},{"subitem_title":"Investigation on the SNR measurement in clinical brain MR images-The influence of tissue non-uniformity, motion artifact and imaging-","subitem_title_language":"en"}]},"item_type_id":"10001","owner":"15","path":["103"],"pubdate":{"attribute_name":"公開日","attribute_value":"2013-12-03"},"publish_date":"2013-12-03","publish_status":"0","recid":"436","relation_version_is_last":true,"title":["MRI頭部臨床画像におけるSNR測定の検討-計測値への不均一性とモーションアーチファクトおよび撮影法の影響-"],"weko_creator_id":"15","weko_shared_id":-1},"updated":"2023-06-21T10:45:20.695276+00:00"}