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dc.contributor.authorHofstad, Erlend Fagertun
dc.contributor.authorSorger, Hanne
dc.contributor.authorBakeng, Janne Beate Lervik
dc.contributor.authorGruionu, Lucian
dc.contributor.authorLeira, Håkon Olav
dc.contributor.authorAmundsen, Tore
dc.contributor.authorLangø, Thomas
dc.date.accessioned2018-02-02T07:31:31Z
dc.date.available2018-02-02T07:31:31Z
dc.date.created2017-06-01T15:51:17Z
dc.date.issued2017
dc.identifier.citationMedical physics (Lancaster). 2017, 44 (8), 4204-4212.nb_NO
dc.identifier.issn0094-2405
dc.identifier.urihttp://hdl.handle.net/11250/2482285
dc.description.abstractPurpose One of the major challenges in electromagnetic navigated bronchoscopy is the navigation accuracy. An initial rigid image-to-patient registration may not be optimal for the entire lung volume, as the lung tissue anatomy is likely to have shifted since the time of computer tomography (CT) acquisition. The accuracy of the initial rigid registration will also be affected throughout the procedure by breathing, coughing, patient movement and tissue displacements due to pressure from bronchoscopy tools. A method to minimize the negative impact from these factors by updating the registration locally during the procedure is needed and suggested in this paper. Methods The intraoperative local registration method updates the initial registration by optimization in an area of special interest, for example, close to a biopsy position. The local registration was developed through an adaptation of a previously published registration method used for the initial registration of CT to the patient anatomy. The method was tested in an experimental breathing phantom setup, where respiratory movements were induced by a robotic arm. Deformations were also applied to the phantom to see if the local registration could compensate for these. Results The local registration was successfully applied in all 15 repetitions, five in each of the three parts of the airway phantom. The mean registration accuracy was improved from 11.8–19.4 mm to 4.0–6.7 mm, varying to some degree in the different segments of the airway model. Conclusions A local registration method, to update and improve the initial image-to patient registration during navigated bronchoscopy, was developed. The method was successfully tested in a breathing phantom setup. Further development is needed to make the method more automatic. It must also be verified in human studies.nb_NO
dc.language.isoengnb_NO
dc.publisherWileynb_NO
dc.titleIntraoperative localized constrained registration in navigated bronchoscopynb_NO
dc.typeJournal articlenb_NO
dc.typePeer reviewednb_NO
dc.description.versionacceptedVersionnb_NO
dc.source.pagenumber4204-4212nb_NO
dc.source.volume44nb_NO
dc.source.journalMedical physics (Lancaster)nb_NO
dc.source.issue8nb_NO
dc.identifier.doi10.1002/mp.12361
dc.identifier.cristin1473585
dc.description.localcodeThis is the peer reviewed version of the following article: [Intraoperative localized constrained registration in navigated bronchoscopy], which has been published in final form at [http://onlinelibrary.wiley.com/doi/10.1002/mp.12361/abstract]. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving. Locked until 30.6.2018 due to copyright restrictions.nb_NO
cristin.unitcode194,65,25,0
cristin.unitnameInstitutt for sirkulasjon og bildediagnostikk
cristin.ispublishedtrue
cristin.fulltextpostprint
cristin.qualitycode1


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