News

Kai Lawonn has successfully defended his Phd thesis on “Illustrative Visualization of Medical Datasets” September, 15. Kai made a number of contributions related to feature lines applied to medical surface meshes. A systematic comparison of existing techniques, the development of new techniques, bridging between feature lines and hatchings, new applications in virtual endoscopy and molecular dynamics. Also for visualizing vascular surfaces along with internal blood flow Kai could strongly improve over existing methods. All this was accomplished in only 2.5 years. The Phd committee rated his performance as “Summa cum laude”.

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We are happy to announce that we will present four papers at this year’s Eurographics Workshop on Visual Computing for Biology and Medicine (EG VCBM) in Vienna, Austria.

“A Comparative User Study of a 2D and an Autostereoscopic 3D Display for a Tympanoplastic Surgery” Alexandra Baer, Antje Huebler, Patrick Saalfeld, Douglas Cunningham, Bernhard Preim.

“Robust Cardiac Function Assessment in 4D PC-MRI Data” Benjamin Köhler, Uta Preim, Matthias Gutberlet, Katharina Fischbach, Bernhard Preim.

“Survey of Labeling Techniques in Medical Visualizations” Steffen Oeltze-Jafra, Bernhard Preim.

“Interactive Labeling of Toponome Data” Steffen Oeltze-Jafra, Franz Pieper, Reyk Hillert, Bernhard Preim, Walter Schubert.

We are looking forward to it!

 

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We are happy to announce that we will present four papers at this years IEEE VIS.

“Combined Visualization of Wall Thickness and Wall Shear Stress for the Evaluation of Aneurysms” Sylvia Glaßer, Kai Lawonn, Thomas Hoffmann, Martin Skalej, Bernhard Preim.

“Interactive Visual Analysis of Image-Centric Cohort Study Data” Paul Klemm, Steffen Oeltze-Jafra, Kai Lawonn, Katrin Hegenscheid, Henry Völzke, Bernhard Preim

“Blood Flow Clustering and Applications in Virtual Stenting of Intracranial Aneurysms” Steffen Oeltze, Dirk J. Lehmann, Alexander Kuhn, Gabor Janiga, Holger Theisel, Bernhard Preim.

“ADR – Anatomy-Driven Reformation” Jan Kretschmer, Grzegorz Soza, Christian Tietjen, Michael Suehling, Bernhard Preim, Marc Stamminger

We look forward to it!

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Sylvia Glaßer, Phd student of the visualization group, successfully defended her thesis “Visual Analysis, Clustering, and Classification of Contrast-Enhanced Tumor Perfusion MRI Data”.

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Tobias Mönch, Phd student of the visualization group, successfully defended his thesis “Context-Aware 3D Model Generation for Biomedical Applications”.

Mathias Neugebauer, Phd student of the visualization group, successfully defended his thesis “Computer-Aided Exploration of Blood Flow in Cerebral Aneurysms – Geometrical Processing and Interactive Visualization”.

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Our joint work with SIEMENS Healthcare and the University of Erlangen was awarded with the only Honorable Mention award in the EuroVis Short Paper Section, making it the 2nd best Short Paper. The paper deals with an improved multivessel reformation technique based on a bilateral filter applied to depth information that effectively avoids small and disturbing discontinuities while preserving large information-carrying discontinuities. Bernhard Preim gets the award from one of the Short Paper Chairs in Swansea.

We are happy that Patrick Saalfeld got a grant for a Phd program from our local government to do research on 3D interaction related to treatment planning problems, such as implant placement and applicator positioning.

Paolo Angelelli from the Visualization research group of the University of Bergen, Norway visited our group in October/November 2011. His visit initiated a long-term collaboration on investigating longitudinal medical and cohort studies between the Visualization group in Bergen (Paolo Angelelli, Cagatay Turkay, and Helwig Hauser), the Department of Biomedicine (Judit Haáasz, Erlend Hodneland and Arvid Lundervold) and the Department of Biological and Medical Psychology (Astri J. Lundervold) at the University of Bergen, and our Visualization group (Steffen Oeltze-Jafra, Bernhard Preim). In the paper resulting from this long-term effort, we demonstrate the interactive visual exploration and analysis of cohort study data, helping with the generation of new hypotheses and contributing to the process of validating them. We propose a data-cube based model which handles partially overlapping data subsets during the interactive visualization. We implemented this model in an application prototype, and used it to analyze data acquired in the context of a Norwegian cohort study on cognitive aging. A pre-print of the paper is available here: http://dx.doi.org/10.1109/MCG.2014.40.

Flow data resulting from steady-state simulations of blood flow in cerebral aneurysms are generally visualized by a dense and cluttered set of streamlines. The paper describes a fully automatic approach for reducing visual clutter and exposing characteristic flow structures by clustering streamlines and computing cluster representatives. While individual clustering techniques have been applied before to streamlines in 3D flow fields, a general quantitative and a domain-specific qualitative evaluation of three state-of-the-art techniques are contributed. It is shown that clustering streamlines contributes to comparing and evaluating different virtual stenting strategies. The paper is the result of a collaboration between our Visualization group (Steffen Oeltze-Jafra, Bernhard Preim), the Institute of Fluid Dynamics and Thermodynamics of our University (Gábor Janiga), the Visual Computing group (Dirk J. Lehmann, Alexander Kuhn, Holger Theisel), and the Institute of Neuroradiology of our University Hospital (Oliver Beuing). It is available here: http://dx.doi.org/10.1109/TVCG.2013.2297914. The accompanying video can be found here: http://www.youtube.com/watch?v=-RVVgqDHzdc.