naa a22 4500 510808050 CHVBK 20180411083427.0 cr unu---uuuuu 180411e20130901xx s 000 0 eng 10.1007/s11548-013-0819-5 doi (NATIONALLICENCE)springer-10.1007/s11548-013-0819-5 An error analysis perspective for patient alignment systems [Elektronische Daten] [Michael Figl, Marcus Kaar, Rainer Hoffman, Alfred Kratochwil, Johann Hummel] Purpose: This paper analyses the effects of error sources which can be found in patient alignment systems. As an example, an ultrasound (US) repositioning system and its transformation chain are assessed. The findings of this concept can also be applied to any navigation system. Methods and materials: In a first step, all error sources were identified and where applicable, corresponding target registration errors were computed. By applying error propagation calculations on these commonly used registration/calibration and tracking errors, we were able to analyse the components of the overall error. Furthermore, we defined a special situation where the whole registration chain reduces to the error caused by the tracking system. Additionally, we used a phantom to evaluate the errors arising from the image-to-image registration procedure, depending on the image metric used. We have also discussed how this analysis can be applied to other positioning systems such as Cone Beam CT-based systems or Brainlab's ExacTrac. Results: The estimates found by our error propagation analysis are in good agreement with the numbers found in the phantom study but significantly smaller than results from patient evaluations. We probably underestimated human influences such as the US scan head positioning by the operator and tissue deformation. Rotational errors of the tracking system can multiply these errors, depending on the relative position of tracker and probe. Conclusions: We were able to analyse the components of the overall error of a typical patient positioning system. We consider this to be a contribution to the optimization of the positioning accuracy for computer guidance systems. CARS, 2013 Error analysis nationallicence Tele-therapy nationallicence Navigation systems nationallicence Figl Michael Vienna General Hospital, Center for Medical Physics and Biomedical Engineering, Medical University of Vienna, Waehringer Guertel 18-20, 1090, Vienna, Austria aut Kaar Marcus Vienna General Hospital, Center for Medical Physics and Biomedical Engineering, Medical University of Vienna, Waehringer Guertel 18-20, 1090, Vienna, Austria aut Hoffman Rainer Vienna General Hospital, Center for Medical Physics and Biomedical Engineering, Medical University of Vienna, Waehringer Guertel 18-20, 1090, Vienna, Austria aut Kratochwil Alfred Vienna General Hospital, Center for Medical Physics and Biomedical Engineering, Medical University of Vienna, Waehringer Guertel 18-20, 1090, Vienna, Austria aut Hummel Johann Vienna General Hospital, Center for Medical Physics and Biomedical Engineering, Medical University of Vienna, Waehringer Guertel 18-20, 1090, Vienna, Austria aut International Journal of Computer Assisted Radiology and Surgery Springer Berlin Heidelberg 8/5(2013-09-01), 849-856 1861-6410 8:5<849 2013 8 11548 https://doi.org/10.1007/s11548-013-0819-5 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11548-013-0819-5 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Figl Michael Vienna General Hospital, Center for Medical Physics and Biomedical Engineering, Medical University of Vienna, Waehringer Guertel 18-20, 1090, Vienna, Austria aut NATIONALLICENCE 700 1- Kaar Marcus Vienna General Hospital, Center for Medical Physics and Biomedical Engineering, Medical University of Vienna, Waehringer Guertel 18-20, 1090, Vienna, Austria aut NATIONALLICENCE 700 1- Hoffman Rainer Vienna General Hospital, Center for Medical Physics and Biomedical Engineering, Medical University of Vienna, Waehringer Guertel 18-20, 1090, Vienna, Austria aut NATIONALLICENCE 700 1- Kratochwil Alfred Vienna General Hospital, Center for Medical Physics and Biomedical Engineering, Medical University of Vienna, Waehringer Guertel 18-20, 1090, Vienna, Austria aut NATIONALLICENCE 700 1- Hummel Johann Vienna General Hospital, Center for Medical Physics and Biomedical Engineering, Medical University of Vienna, Waehringer Guertel 18-20, 1090, Vienna, Austria aut NATIONALLICENCE 773 0- International Journal of Computer Assisted Radiology and Surgery Springer Berlin Heidelberg 8/5(2013-09-01), 849-856 1861-6410 8:5<849 2013 8 11548 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer