News

We are happy that two of our submissions for the EuroVis conference in Leipzig were finally accepted and will appear in the Computer Graphics Forum.

Kai Lawonn is the principal author of the paper “Streamlines for Illustrative Real-time Rendering” where he suggests a new method to place lines on surfaces of complex (anatomical) surface models. These lines are seeded along curvature-related vector fields and provide more shape information than conventional feature lines. The line generation process, including curvature estimation, as well as the efficient rendering is described in the paper.

Mathias Neugebauer introduced “AmniVis – A System for Qualitative Exploration of Near-Wall Hemodynamics in Cerebral Aneurysms”. The paper is based on many in-depth discussions with neuroradiologists and aims to present results of unsteady (time-dependent) CFD simulations intuitively and effectively. Essential questions, guiding this research, are: How can the user efficiently select relevant time steps? What features are particularly interesting? How they can be emphasized and assessed?

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Die Arbeitsgruppe “Medizinische Visualisierung” an der Universität Magdeburg feiert ihr 10-jähriges Bestehen. Aus diesem Anlass wird es am 26. April 2013 ab 15 Uhr im Hörsaal der Fakultät für Informatik (G29-307) ein Symposium geben, bei dem ein kleiner Einblick in die vergangenen 10 Jahre und in die Arbeiten der Arbeitsgruppe, ehemaliger Mitarbeiter und eng verbundener Partner gegeben wird.

On January 30, the kick-off event for the research campus STIMULATE (Solution Centre for Image guided local Therapies) takes place, see the schedule:

The research campus is a joint activity between our University, SIEMENS Healthcare as well as a number of associated companies.

We are looking forward to the visit of Anders Ynnerman, clearly the key visualization researcher in Sweden and in particular the leading medical visualization expert there. He is known among others for his work on interactive exploration of large medical data using modern surface and touch technology, see his popular TED talk.

Anders leads the famous visualization center in Norrköping, closely collaborates with the imaging center in Linköping and recently co-organized the Eurographics Workshop on Visual Computing in Biology in Medicine. Anders visits both, the visual computing and the visualization group and gives a talk in the visual computing colloquium (Link: http://wwwisg.cs.uni-magdeburg.de/visual/index.php?article_id=163) series on 1:15 pm on Friday early afternoon.

Our journal submission “The LiverSurgeryTrainer – Training of Computer-Based Planning in Liver Surgery” was accepted at the International Journal of Computer Assisted Radiology and Surgery. The paper with Jeanette Mönch as Principal author documents as a summary our long-term efforts to create a software system for case-based training, including expert opinions, intraoperative videos and resection proposals. Surgeons may assess the operability and resectability and compare their decisions with expert decisions and their explanations. Many thanks for the cooperation to Fraunhofer MEVIS, in particular Christian Hansen and Prof. Karl Oldhafer, our major medical partner. We are also thankful to many other surgeons for providing the necessary feedback.

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Rocco Gasteiger’s work on the visual exploration of cerebral blood flow was selected for the first price from 17 submissions to this year’s Karl-Heinz Höhne Award. At the photos, Dr. Stefan Zachow from Zuse-Institute Berlin who was the head of the selection committee (together with Prof. Dorit Merhof), awards the price. Rocco was the first author of two related IEEE TVCG papers exploring features of cerebral blood flow in the presence of cerebral aneuryms.

Besides his numerous own ideas, concepts, and implementations, he carefully collaborated with colleagues and other groups. He integrated important works from our partners in flow simulation (Gabor Janiga, Dominique Thevenin), from our medical partners (Oliver Beuing, Martin Skalej), our friends from Eindhoven (Roy van Pelt, Anna Vilanova) as well our colleagues from the visual computing group (Dirk Lehmann, Holger Theisel) and finally, Rocco very effectively teamed up with Mathias in our group for many years now.

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Ben developed tools to process these time-dependent blood flow data, searching for topologically interesting regions, like those with high helicality and vorticity. The visual exploration of blood flow in the human Aorta is then focussed on such regions.

The work was carried out in a close collaboration with the Heart Center in Leipzig (Prof. Gutberlet) where such data are acquired to assess mitral valve defects, congenital heart diseases and other pathologies. Ben did an extraordinary job in understanding this imaging technique and the resulting data as well as in the development of a mathematically sound basis for the exploration.

His written thesis, like the oral defense was assessed with the highest possible grade.

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This year’s Eurographics Workshop on Visual Computing in Biology and Medicine (www.vcbm.org) took place at the Visualization Center in Norrköping, Sweden. From the 17 full paper presentations, three were given by our group.

Katja Mogalle presented a method for automatic label placement in 2D image slices for the reading of radiological images. Based on a case study, the main constraints for label placement have been analyzed and are evaluated for finding valid and suitable label positions.

Steffen Oeltze described a volume rendering approach for visualizing protein patterns of 3D toponome data. The utility provides multiple coordinated views and techniques for interacting with the 3D view in an exploratory analysis.

Tobias Mönch developed a framework, which allows to perform mesh smoothing and model quality estimation in real-time. Based on an OpenGL implementation, suggestions for optimal smoothing parameters may determined and used to simply the use of mesh smoothing filters. This paper has been selected as one of the three best papers and has been invited for publication in Computer Graphics Forum.

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Rocco Gasteiger lead a team that came up with a successful submission for this years IEEE VisWeek. The paper “Automatic Detection and Visualization of Qualitative Hemodynamic Characteristics in Cerebral Aneurysms” is a joint work with the Visual Computing group of the University of Magdeburg, the Biomedical Engineering group of the Technical University of Eindhoven (in particular Dr. Anna Vilanova and Dr. Roy van Pelt), the department of Fluid Dynamics and Thermodynamics at the University of Magdeburg, and the University Hospital Magdeburg. With this method, important hemodynamic characteristics such as the inflow jet and the impingement zone of blood flow in cerebral aneurysms (see the images) can be extracted and visualized automatically and reliably. The paper will appear in the IEEE Transactions on Visualization and Graphics (TVCG).

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