{"created":"2023-06-19T09:16:39.558166+00:00","id":29195,"links":{},"metadata":{"_buckets":{"deposit":"1ed447c0-cb58-4572-a8df-76e4d0c76476"},"_deposit":{"created_by":1,"id":"29195","owners":[1],"pid":{"revision_id":0,"type":"depid","value":"29195"},"status":"published"},"_oai":{"id":"oai:kumadai.repo.nii.ac.jp:00029195","sets":["413:443"]},"author_link":["134261","134273"],"item_16_biblio_info_6":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"2012-10-26","bibliographicIssueDateType":"Issued"},"bibliographicIssueNumber":"22","bibliographicPageEnd":"7627","bibliographicPageStart":"7615","bibliographicVolumeNumber":"57","bibliographic_titles":[{"bibliographic_title":"Physics in Medicine and Biology"}]}]},"item_16_creator_3":{"attribute_name":"別言語の著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"荒木, 不次男"}],"nameIdentifiers":[{"nameIdentifier":"134273","nameIdentifierScheme":"WEKO"}]}]},"item_16_description_17":{"attribute_name":"フォーマット","attribute_value_mlt":[{"subitem_description":"application/pdf","subitem_description_type":"Other"}]},"item_16_description_46":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"subitem_description":"論文(Article)","subitem_description_type":"Other"}]},"item_16_description_5":{"attribute_name":"内容記述","attribute_value_mlt":[{"subitem_description":"The purpose of this study was to investigate the perturbation correction factors and inhomogeneity correction factors (ICFs) for a thin-walled cylindrical ion chamber in a heterogeneous phantom including solid water, lung and bone plastic materials. The perturbation factors due to the replacement of the air cavity, non-water equivalence of the wall and the stem, non-air equivalence of the central electrode and the overall perturbation factor, P_Q, for a cylindrical chamber, in the heterogeneous phantom were calculated with the EGSnrc/Cavity Monte Carlo code for 6 and 15 MV photon beams. The PTW31010 (0.125 cm^3) chamber was modeled with Monte Carlo simulations, and was used for measurements and calculations of percentage depth ionization (PDI) or percentage depth dose (PDD). ICFs were calculated from the ratio of the product of the stopping power ratios (SPRs) and P_Q of lung or bone to solid water. Finally, the measured PDIs were converted to PDDs by using ICFs and were compared with those calculated by the Monte Carlo method. The perturbation effect for the ion chamber in lung material is insignificant at 5×5 and 10×10cm^2 fields, but the effect needs to be considered under conditions of lateral electron disequilibrium with a 3×3cm^2 field. ICFs in lung varied up to 2% and 4% depending on the field size for 6 and 15 MV, respectively. For bone material, the perturbation effects due to the chamber wall and the stem were more significant at up to 3.5% and 1.6% for 6 MV, respectively. ICFs for bone material were approximately 0.945 and 0.940 for 6 and 15 MV, respectively. The converted PDDs by using ICFs were in good agreement with Monte Carlo calculated PDDs. The chamber perturbation correction and SPRs should strictly be considered for ion chamber dosimetry in heterogeneous media. This is more important for small field dosimetry in lung and bone materials.","subitem_description_type":"Other"}]},"item_16_description_77":{"attribute_name":"URL","attribute_value_mlt":[{"subitem_description":"http://iopscience.iop.org/article/10.1088/0031-9155/57/22/7615/meta;jsessionid=9DDC0BEC8AC5C3D54172F395A5F1E958.c1","subitem_description_type":"Other"}]},"item_16_publisher_36":{"attribute_name":"出版者","attribute_value_mlt":[{"subitem_publisher":"IOP Publishing"}]},"item_16_relation_10":{"attribute_name":"PubMed番号","attribute_value_mlt":[{"subitem_relation_type":"isVersionOf","subitem_relation_type_id":{"subitem_relation_type_id_text":"23103477","subitem_relation_type_select":"PMID"}}]},"item_16_relation_11":{"attribute_name":"DOI","attribute_value_mlt":[{"subitem_relation_type":"isVersionOf","subitem_relation_type_id":{"subitem_relation_type_id_text":"10.1088/0031-9155/57/22/7615.","subitem_relation_type_select":"DOI"}}]},"item_16_rights_12":{"attribute_name":"権利","attribute_value_mlt":[{"subitem_rights":"© 2012 Institute of Physics and Engineering in Medicine"}]},"item_16_source_id_7":{"attribute_name":"ISSN","attribute_value_mlt":[{"subitem_source_identifier":"00319155","subitem_source_identifier_type":"ISSN"}]},"item_16_source_id_9":{"attribute_name":"書誌レコードID","attribute_value_mlt":[{"subitem_source_identifier":"AA10558592","subitem_source_identifier_type":"NCID"}]},"item_16_text_18":{"attribute_name":"形態","attribute_value_mlt":[{"subitem_text_value":"249420 bytes"}]},"item_16_text_47":{"attribute_name":"資源タイプ・ローカル","attribute_value_mlt":[{"subitem_text_value":"雑誌掲載論文"}]},"item_16_text_48":{"attribute_name":"資源タイプ・NII","attribute_value_mlt":[{"subitem_text_value":"Journal Article"}]},"item_16_text_49":{"attribute_name":"資源タイプ・DCMI","attribute_value_mlt":[{"subitem_text_value":"text"}]},"item_16_text_50":{"attribute_name":"資源タイプ・ローカル表示コード","attribute_value_mlt":[{"subitem_text_value":"01"}]},"item_16_text_78":{"attribute_name":"コメント","attribute_value_mlt":[{"subitem_text_value":"【著者所属】熊本大学大学院生命科学研究部 医用画像学"}]},"item_16_version_type_19":{"attribute_name":"著者版フラグ","attribute_value_mlt":[{"subitem_version_type":"AM"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorAffiliations":[{"affiliationNameIdentifiers":[{"affiliationNameIdentifier":"","affiliationNameIdentifierScheme":"ISNI","affiliationNameIdentifierURI":"http://www.isni.org/isni/"}],"affiliationNames":[{"affiliationName":"","affiliationNameLang":"ja"}]}],"creatorNames":[{"creatorName":"荒木, 不次男","creatorNameLang":"ja"},{"creatorName":"アラキ, フジオ","creatorNameLang":"ja-Kana"},{"creatorName":"Araki, Fujio","creatorNameLang":"en"}],"familyNames":[{"familyName":"荒木","familyNameLang":"ja"},{"familyName":"アラキ","familyNameLang":"ja-Kana"},{"familyName":"Araki","familyNameLang":"en"}],"givenNames":[{"givenName":"不次男","givenNameLang":"ja"},{"givenName":"フジオ","givenNameLang":"ja-Kana"},{"givenName":"Fujio","givenNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"134261","nameIdentifierScheme":"WEKO"}]}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2020-03-03"}],"displaytype":"detail","filename":"Phys Med Biol_57_22_7615-7627.pdf","filesize":[{"value":"249.4 kB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"Phys Med Biol_57_22_7615-7627.pdf","url":"https://kumadai.repo.nii.ac.jp/record/29195/files/Phys Med Biol_57_22_7615-7627.pdf"},"version_id":"8132ee9d-b569-4a80-be0b-d572ad84b5df"}]},"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":"Monte Carlo-based correction factors for ion chamber dosimetry in heterogeneous phantoms for megavoltage photon beams","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"Monte Carlo-based correction factors for ion chamber dosimetry in heterogeneous phantoms for megavoltage photon beams"}]},"item_type_id":"16","owner":"1","path":["443"],"pubdate":{"attribute_name":"公開日","attribute_value":"2015-09-16"},"publish_date":"2015-09-16","publish_status":"0","recid":"29195","relation_version_is_last":true,"title":["Monte Carlo-based correction factors for ion chamber dosimetry in heterogeneous phantoms for megavoltage photon beams"],"weko_creator_id":"1","weko_shared_id":-1},"updated":"2023-09-04T23:52:56.134063+00:00"}