Institut für Medizintechnik und Medizininformatik
Dauerhafte URI für die Sammlunghttps://irf.fhnw.ch/handle/11654/23
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Ergebnisse nach Hochschule und Institut
Publikation Automatic landmark identification for surgical 3d-navigation – A proposed method for marker-free dental surgical navigation systems(De Gruyter, 04.07.2022) Bischofberger, Micha; Schkommodau, Erik; Böhringer, StephanThis paper proposes a conceptual method to calculate the pose of a stereo-vision camera relative to an artificial mandible without additional markers. The general method for marker-free navigation has four steps: 1) parallel image acquisition by a stereo-vision camera, 2) automatic identification of 2d point pairs (landmark pairs) in a left and a right image, 3) calculation of related 3d points in the joint camera coordinate system and 4) matching of 3d points generated to a preoperative 3d model (i.e., CT data based). To identify and compare landmarks in the acquired stereo images, well-known algorithms for landmark detection, description and matching were compared within the developed approach. Finally, the BRISK algorithm (Leutenegger S, Chli M, Siegwart RY. BRISK: Binary Robust invariant scalable keypoints. Proceedings of the IEEE International Conference on Computer Vision; 2011: 2548–2555) was used. The proposed method was implemented in MATLAB and validated with one artificial mandible. The accuracy evaluation of the camera positions calculated resulted in an average deviation error of 1.45 mm ± 0.76 mm to the real camera displacement. This value was calculated using only stereo images with over 100 reconstructed landmark pairs each. This provides the basis for marker-free navigation.01A - Beitrag in wissenschaftlicher ZeitschriftPublikation Electrospray mediated localized and targeted chemotherapy in a mouse model of lung cancer(Frontiers, 21.04.2021) Hradetzky, David; Gazdhar, Amiq; Ruzgys, Paulius; Böhringer, Stephan; Sila Dokumaci, Ayse; Hari, Yvonne; Schürch, Christian; Brühl, Frido; Schürch, Stefan; Sönke, Szidat; Riether, Carsten; Satkauskas, Saulius; Geiser, ThomasAn advanced stage, centrally localized invasive tumor is a major cause of sudden death in lung cancer patients. Currently, chemotherapy, radiotherapy, laser ablation, or surgical resection if possible are the available state-of-the-art treatments but none of these guarantee remedy or long-term relief and are often associated with fatal complications. Allowing localized chemotherapy, by direct and confined drug delivery only at the tumor site, could be a promising option for preoperative down staging or palliative therapy. Here we report the localized and targeted application of intra tumor delivery of chemotherapeutics using a novel device based on the principle of electrospray.01A - Beitrag in wissenschaftlicher ZeitschriftPublikation Electrospray-mediated local chemotherapy of lung carcinoma in mice(European Respiratory Society, 2016) Hradetzky, David; Böhringer, Stephan; Satkauskas, Saulius; Geiser, Thomas; Gazdhar, Amiq; Ruzgys, Paulius01A - Beitrag in wissenschaftlicher ZeitschriftPublikation Degradable Mg scaffolds produced by selective laser melting (P1035)(05/2016) Rüegg, Jasmine; Böhringer, Stephan; Kessler, Anja; Schumacher, Ralf; Schkommodau, Erik; de Wild, Michael06 - PräsentationPublikation Accuracy investigation of a new mininavigation system for dental implants(10/2016) Böhringer, Stephan; Jürgens, Philipp; Schkommodau, Erik; Berlinghoff, Frank; Hemm-Ode, Simone06 - Präsentation