Susanne Winter

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For many navigated surgical procedures, the precise registration of preoperative data sets with bones of the patient is an important requisite. Conventional navigation systems use paired point registration based on anatomical landmarks or fiducial markers. This approach increases the invasiveness, since landmarks must be exposed and fiducial markers must be(More)
PURPOSE Contrast-enhanced ultrasound (CEUS) imaging of tissue perfusion is based on microbubble echo detection. CEUS can visualize tumors based on local perfusion variations. The acquired video data are qualitatively interpreted by subjective visualization in clinical practice. An automated CEUS classifier was developed for intraoperative identification of(More)
Zusammenfassung. Ein zentrales Problem in der bildgestützten, na-vigierten Chirurgie ist die exakte Registrierung präoperativer CT/MR-Daten im Koordinatensystem des Operationssaales. Um die Nachteile einer landmarkenbasierten Registrierung zu umgehen, dient bei unse-rem Ansatz 3-dimensionaler, intraoperativer Ultraschall zur Registrie-rung. Ein(More)
Beech forests previously covered substantial areas of the continental region of Europe, however, their current distribution is limited to a small percentage of their former yet still potential range. Many beech forests are now protected under the European Union-wide conservation approach of Natura 2000. We analyse the impact of Natura 2000 on the management(More)
The potential natural vegetation (PNV) is a tool for landscape planning, nature preservation and the assessment of naturalness. It is mostly constructed by the application of expert knowledge. This paper shows the advantages of using a more sophisticated and formalized PNV construction that overlays vegetation types and site factor maps by applying a Bayes(More)
Medical navigation systems for orthopedic surgery are becoming more and more important with the increasing proportion of older people in the population, and hence the increasing incidence of diseases of the musculoskeletal system. The central problem for such systems is the exact transformation of the preoperatively acquired datasets to the coordinate(More)
We studied the effects of transcranial magnetic stimulation (TMS) on slow cortical potentials (SCPs) of the brain elicited during performance of a feedback and reward task. Ten healthy participants were trained to self-regulate their SCP amplitude using visual feedback and reward for increased or decreased amplitudes. Subjects participated in 27 runs (each(More)