{"created":"2023-05-15T14:55:43.876793+00:00","id":75673,"links":{},"metadata":{"_buckets":{"deposit":"ac56f207-867d-4ee5-81a4-b009271caa9f"},"_deposit":{"created_by":1,"id":"75673","owners":[1],"pid":{"revision_id":0,"type":"depid","value":"75673"},"status":"published"},"_oai":{"id":"oai:repo.qst.go.jp:00075673","sets":["1"]},"author_link":["798957","798967","798963","798958","798962","798956","798964","798966","798968","798970","798969","798965","798971","798961","798960","798959","798955"],"item_8_biblio_info_7":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"2019-04","bibliographicIssueDateType":"Issued"},"bibliographicIssueNumber":"4","bibliographicPageEnd":"1574","bibliographicPageStart":"1561","bibliographicVolumeNumber":"46","bibliographic_titles":[{"bibliographic_title":"Medical Physics"}]}]},"item_8_description_5":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"Purpose: To perform the final quality assurance of our fluoroscopic-based markerless tumor tracking for gated carbon-ion pencil beam scanning (C-PBS) radiotherapy using a rotating gantry system, we evaluated the geometrical accuracy and tumor tracking accuracy using a moving chest phantom with simulated respiration.\nMethods: The positions of the dynamic flat panel detector (DFPD) and X-ray tube are subject to changes due to gantry sag. To compensate for this, we generated a geometrical calibration table (gantry flex map) in 15° gantry angle steps by the bundle adjustment method. We evaluated five metrics: (i) Geometrical calibration was evaluated by calculating chest phantom positional error using 2D/3D registration software for each 5° step of the gantry angle. (ii) Moving phantom displacement accuracy was measured (± 10 mm in 1-mm steps) with a laser sensor. (iii) Tracking accuracy was evaluated with machine learning (ML) and multi-template matching (MTM) algorithms, which used fluoroscopic images and digitally reconstructed radiographic (DRR) images as training data. The chest phantom was continuously moved ± 10 mm in a sinusoidal path with a moving cycle of 4 s and respiration was simulated with ± 5 mm expansion/contraction with a cycle of 2 s. This was performed with the gantry angle set at 0°, 45°, 120°, and 240°. (iv) Four types of interlock function were evaluated: tumor velocity, DFPD image brightness variation, tracking anomaly detection, and tracking positional inconsistency in between the two corresponding rays. (v) Gate on/off latency, gating control system latency, and beam irradiation latency were measured using a laser sensor and an oscilloscope.\nResults: By applying the gantry flex map, phantom positional accuracy was improved from 1.03 mm/0.33° to < 0.45 mm/0.27° for all gantry angles. The moving phantom displacement error was 0.1 mm. Due to long computation time, the tracking accuracy achieved with ML was < 0.49 mm (= 95% confidence interval [CI]) for imaging rates of 15 fps and 7.5 fps; those at 30 fps were decreased to 1.84 mm (95% CI: 1.79 mm–1.92 mm). The tracking positional accuracy with MTM was < 0.52 mm (= 95% CI) for all gantry angles and imaging frame rates. The tumor velocity interlock signal delay time was 44.7 ms (= 1.3 frame). DFPD image brightness interlock latency was 34 ms (= 1.0 frame). The tracking positional error was improved from 2.27 ± 2.67 mm to 0.25 ± 0.24 mm by the tracking anomaly detection interlock function. Tracking positional inconsistency interlock signal was output within 5.0 ms. The gate on/off latency was < 82.7 ± 7.6 ms. The gating control system latency was < 3.1 ± 1.0 ms. The beam irradiation latency was < 8.7 ± 1.2 ms.\nConclusions: Our markerless tracking system is now ready for clinical use. We hope to shorten the computation time needed by the ML algorithm at 30 fps in the future.\n","subitem_description_type":"Abstract"}]},"item_8_publisher_8":{"attribute_name":"出版者","attribute_value_mlt":[{"subitem_publisher":"Wiley"}]},"item_8_relation_14":{"attribute_name":"DOI","attribute_value_mlt":[{"subitem_relation_type_id":{"subitem_relation_type_id_text":"10.1002/mp.13403","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://aapm.onlinelibrary.wiley.com/doi/full/10.1002/mp.13403","subitem_relation_type_select":"URI"}}]},"item_8_source_id_9":{"attribute_name":"ISSN","attribute_value_mlt":[{"subitem_source_identifier":"0094-2405","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":"森, 慎一郎"}],"nameIdentifiers":[{"nameIdentifier":"798955","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"坂田, 幸辰"}],"nameIdentifiers":[{"nameIdentifier":"798956","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"平井, 隆介"}],"nameIdentifiers":[{"nameIdentifier":"798957","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"古市, 渉"}],"nameIdentifiers":[{"nameIdentifier":"798958","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Shimabukuro, Kazuki"}],"nameIdentifiers":[{"nameIdentifier":"798959","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"河野, 良介"}],"nameIdentifiers":[{"nameIdentifier":"798960","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Woong Seop, Keum"}],"nameIdentifiers":[{"nameIdentifier":"798961","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"井関, 康"}],"nameIdentifiers":[{"nameIdentifier":"798962","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Kasai, Shigeru"}],"nameIdentifiers":[{"nameIdentifier":"798963","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Okaya, Keiko"}],"nameIdentifiers":[{"nameIdentifier":"798964","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Mori, Shinichiro","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"798965","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Sakata, Yukinobu","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"798966","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Hirai, Ryusuke","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"798967","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Furuichi, Wataru","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"798968","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Kohno, Ryosuke","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"798969","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Keum, WoongSeop","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"798970","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Iseki, Yasushi","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"798971","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":"Commissioning of a fluoroscopic-based real-time markerless tumor tracking system in a superconducting rotating gantry for carbon-ion pencil beam scanning treatment","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"Commissioning of a fluoroscopic-based real-time markerless tumor tracking system in a superconducting rotating gantry for carbon-ion pencil beam scanning treatment"}]},"item_type_id":"8","owner":"1","path":["1"],"pubdate":{"attribute_name":"公開日","attribute_value":"2019-01-22"},"publish_date":"2019-01-22","publish_status":"0","recid":"75673","relation_version_is_last":true,"title":["Commissioning of a fluoroscopic-based real-time markerless tumor tracking system in a superconducting rotating gantry for carbon-ion pencil beam scanning treatment"],"weko_creator_id":"1","weko_shared_id":-1},"updated":"2023-05-15T23:50:31.822330+00:00"}