{"created":"2023-05-15T14:52:14.234302+00:00","id":71322,"links":{},"metadata":{"_buckets":{"deposit":"07a5679e-f3fa-4b6e-9e23-2f320eb5fbca"},"_deposit":{"created_by":1,"id":"71322","owners":[1],"pid":{"revision_id":0,"type":"depid","value":"71322"},"status":"published"},"_oai":{"id":"oai:repo.qst.go.jp:00071322","sets":["10:28"]},"author_link":["701239","701241","701255","701258","701251","701252","701246","701256","701248","701253","701245","701243","701242","701244","701249","701250","701254","701257","701240","701247"],"item_10005_date_7":{"attribute_name":"発表年月日","attribute_value_mlt":[{"subitem_date_issued_datetime":"2013-11-02","subitem_date_issued_type":"Issued"}]},"item_10005_description_5":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"Several MRI-based attenuation correction methods have been reported for PET/MRI. The accuracy of the attenuation map (mu-map) from an MRI image depends on correctness of the segmentation of tissue and the attenuation coefficients to be assigned (mu-values). However, an MRI image does not reflect the attenuation of radiation and inaccurate assignment of mu-values affects the quantitative assessment of functional images of PET. Although installation of a transmission scan function on the PET/MRI can provide an accurate mu-map, it restricts the design of the scanner, increases the manufacturing cost and takes additional scanning time. In this study, we proposed an MRI-based mu-value estimation method with a non-rotational radiation source to construct the proper mu-map for PET/MRI. The proposed method uses the accurately segmented tissue map, the partial path length of each tissue, and detected intensities of attenuated radiation from a fixed-position radiation source which usually rotates around the subject to obtain the mu-map with the tomographic procedure. According to the Lambert-Beer law, attenuated intensity is described as the function of partial path length and mu-values of every tissue. The partial path length could be estimated by the simulation of fixed-point radiation with the same scanner geometry using the known tissue map from MRI. The mu-values of every tissue could be estimated by inverting the function. The simulation results, based upon measurement data, showed the averaged errors between mu-values of the conventional transmission scan and our proposed method were 2.3%, 18.6% and -11.1% for brain, bone and soft tissue other than brain, respectively. Although there were over- and under-estimations for bone and soft tissue, respectively, the present method is able to estimate the brain mu-value accurately and that strongly affects the quantitative value of PET images because of the large volumetric ratio of the brain.","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":"IEEE NSS/MIC/RTSD 2013","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":"Kawaguchi, Hiroshi"}],"nameIdentifiers":[{"nameIdentifier":"701239","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Hirano, Yoshiyuki"}],"nameIdentifiers":[{"nameIdentifier":"701240","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Yoshida, Eiji"}],"nameIdentifiers":[{"nameIdentifier":"701241","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Suga, Mikio"}],"nameIdentifiers":[{"nameIdentifier":"701242","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Shiraishi, Takahiro"}],"nameIdentifiers":[{"nameIdentifier":"701243","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Tanimoto, Katsuyuki"}],"nameIdentifiers":[{"nameIdentifier":"701244","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Kimura, Yasuyuki"}],"nameIdentifiers":[{"nameIdentifier":"701245","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Obata, Takayuki"}],"nameIdentifiers":[{"nameIdentifier":"701246","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Ito, Hiroshi"}],"nameIdentifiers":[{"nameIdentifier":"701247","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Yamaya, Taiga"}],"nameIdentifiers":[{"nameIdentifier":"701248","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"川口 拓之","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"701249","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"平野 祥之","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"701250","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"吉田 英治","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"701251","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"菅 幹生","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"701252","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"白石 貴博","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"701253","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"谷本 克之","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"701254","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"木村 泰之","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"701255","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"小畠 隆行","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"701256","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"伊藤 浩","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"701257","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"山谷 泰賀","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"701258","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":"A MRI-Based PET Attenuation Correction with mu-Values Measured by a Fixed-Position Radiation Source","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"A MRI-Based PET Attenuation Correction with mu-Values Measured by a Fixed-Position Radiation Source"}]},"item_type_id":"10005","owner":"1","path":["28"],"pubdate":{"attribute_name":"公開日","attribute_value":"2013-11-06"},"publish_date":"2013-11-06","publish_status":"0","recid":"71322","relation_version_is_last":true,"title":["A MRI-Based PET Attenuation Correction with mu-Values Measured by a Fixed-Position Radiation Source"],"weko_creator_id":"1","weko_shared_id":-1},"updated":"2023-05-15T19:52:35.896124+00:00"}