{"created":"2023-06-19T07:38:12.436756+00:00","id":1166,"links":{},"metadata":{"_buckets":{"deposit":"26486407-228f-4dae-aa0b-683f6fe2eb96"},"_deposit":{"created_by":3,"id":"1166","owners":[3],"pid":{"revision_id":0,"type":"depid","value":"1166"},"status":"published"},"_oai":{"id":"oai:mdu.repo.nii.ac.jp:00001166","sets":["1:46:81"]},"author_link":["0"],"item_2_alternative_title_1":{"attribute_name":"その他（別言語等）のタイトル","attribute_value_mlt":[{"subitem_alternative_title":"Image Reconstruction Functions and Metal Pin Artifact Reducer in CT-Scanner"}]},"item_2_biblio_info_7":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"1989-04-30","bibliographicIssueDateType":"Issued"},"bibliographicIssueNumber":"1","bibliographicPageEnd":"26","bibliographicPageStart":"16","bibliographicVolumeNumber":"15","bibliographic_titles":[{"bibliographic_title":"松本歯学"}]}]},"item_2_description_19":{"attribute_name":"フォーマット","attribute_value_mlt":[{"subitem_description":"application/pdf","subitem_description_type":"Other"}]},"item_2_description_5":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"It is well known that metallic materials in patients cause severe artifacts on CT scans, which can considerably impair the information contained in the image. As the CT scanner prepares the user's program, we used the soft Metal Pin Artifacts Reducer (MPAR) program, and attempted to apply the CT to the removal of artifacts which were brought about due to the use of dental materials or metals. Preceding the use of this program, image reconstruction functions (FC) of the CT scanner vary from FC1 to FC7, so we investigated the relation between each function from FC1 to FC5 and resultant images. CT images for FC1, FC2 and FC4 were considerably softer images, and artifacts originated in heavy metals were more intense at FC1 and FC2. However, among those tested, FC1 was harder and FC4 was softer than FC2. Images for FC3 and FC5, on the other hand, were vary hard. Results obtained by measuring CT values of dental materials indicated that the rates of function for FC1 to FC5 were approximately constituted by 1.0:0.9:0.3:0.8:0.3. Therefore, it seems that the softening of image from FC1 to FC2, and as far as FC4, is due to a lower rate of function; allowing for the production of a lower image contrast by decreasing the differences of CT value between an object and neighbors. FC3 and FC5 image hardness, on the other hand, was due to condensing CT values to 1/3 of FC1. Consequently, the images of FC3 and FC5 could not be clearly discerned and appeared rather flat and sharp. Finally, we examined the removal of artifacts by using MPAR soft. In most cases, artifacts were not successfully removed during the first procedure; barely visible white remnants were left in place of the artifacts. Regardless of whether remnants could be seen or not, a broad banded image always appeared in their place. Therefore, from these results, we currently feel that instead of immediately utilizing MPAR soft to reduce artifacts, it is better to select desirable window levels and widths which cannot be disturbed by artifacts, and can be made to fit to the diagnostic purpose. In order to more clearly understand the results of the removal of artifacts in the dental region, we feel that more time will be needed. It is our hope that serious consideration continues to be given to the development of soft programs.","subitem_description_type":"Abstract"}]},"item_2_publisher_8":{"attribute_name":"出版者","attribute_value_mlt":[{"subitem_publisher":"松本歯科大学学会"}]},"item_2_source_id_11":{"attribute_name":"書誌レコードID","attribute_value_mlt":[{"subitem_source_identifier":"AN00232590","subitem_source_identifier_type":"NCID"}]},"item_2_source_id_9":{"attribute_name":"ISSN","attribute_value_mlt":[{"subitem_source_identifier":"0385-1613","subitem_source_identifier_type":"ISSN"}]},"item_2_version_type_20":{"attribute_name":"著者版フラグ","attribute_value_mlt":[{"subitem_version_resource":"http://purl.org/coar/version/c_970fb48d4fbd8a85","subitem_version_type":"VoR"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"筒井, 稔"},{"creatorName":"丸山, 清"},{"creatorName":"長内, 剛"},{"creatorName":"児玉, 健三"},{"creatorName":"柴田, 常克"}],"nameIdentifiers":[{}]}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2012-05-24"}],"displaytype":"detail","filename":"matsumoto_shigaku_15-01-02.pdf","filesize":[{"value":"3.0 MB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"matsumoto_shigaku_15-01-02.pdf","url":"https://mdu.repo.nii.ac.jp/record/1166/files/matsumoto_shigaku_15-01-02.pdf"},"version_id":"9cbf6064-484a-4d7a-9f13-da2ae90e4683"}]},"item_keyword":{"attribute_name":"キーワード","attribute_value_mlt":[{"subitem_subject":"CTスキャン","subitem_subject_scheme":"Other"},{"subitem_subject":"アーチファクト","subitem_subject_scheme":"Other"},{"subitem_subject":"画像再構成関数","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":"CTスキャナの画像再構成関数と金属片アーチファクト軽減ソフトウェア","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"CTスキャナの画像再構成関数と金属片アーチファクト軽減ソフトウェア"}]},"item_type_id":"2","owner":"3","path":["81"],"pubdate":{"attribute_name":"公開日","attribute_value":"2012-05-24"},"publish_date":"2012-05-24","publish_status":"0","recid":"1166","relation_version_is_last":true,"title":["CTスキャナの画像再構成関数と金属片アーチファクト軽減ソフトウェア"],"weko_creator_id":"3","weko_shared_id":-1},"updated":"2023-06-19T08:20:32.164261+00:00"}