Dr. Katja Bühler Key Researcher Medical Visualization e-mail:  buehler@vrvis.at phone:  (+43-1) 20501 30702 fax:       (+43-1) 20501 30900

• Visualization and Analysis of Medical Image Data
  • Computer Aided Diagnosis
  • Computer Aided Surgery
• Visualization and Image Analysis for 3D Non Destructive Testing
• Computer Aided Geometric Design

• 1989 - 1996  Study of Mathematics and Computer Science, University of Karlsruhe, Germany. Specialization in Numerical Mathematics, Geometry and Computer Graphics.
• 1996 Diploma in Mathematics
  
• 1995-1997 Student Research Assistent, Institute of Applied Mathematics, Research Group Computer Arithmetic and Validated Numerics, University of Karlsruhe
• 1997-1998 Research Assistant at the Centro de Computacion Grafica y Geometria Aplicada at Universidad Central de Venezuela, Caracas. (Financed by the German Acadamic Exchange Service DAAD.)
• April 1998 - March 2002 University Assistant at the Vienna University of Technology
• 2001 PhD in Computer Science at the Vienna University of Technology
• April 2002 - June 2003 Senior Researcher at VRVis, Vienna
• Since July 2003 Key Researcher and Head of the Medical Visualization Group at VRVis, Vienna

Publications

• Beyer, J. , Hadwiger, M., Wolfsberger, S., Bühler, K.
  High-Quality Multimodal Volume Rendering for Preoperative Planning of Neurosurgical Interventions
  IEEE Visualization 2007 (accepted for publication)
• Zambal, S., Hladuvka, J., Bühler, K.
  A fully automatic system for segmentation and analysis of the left and right ventricles of the heart using a bi-temporal two-component model 
  Proceedings of Computer Assisted Radiology and Surgery (CARS) 2007
• Schulze, F., Bühler, K., Hadwiger, M.
  Interactive Deformation and Visualization of Large Volume Datasets
  Proceedings of 2^nd International Conference on Computer Graphics Theory and Applications (GRAPP) 2007
• Beyer, J., Langer, C., Fritz, L., Hadwiger, M., Wolfsberger, S., Bühler, K.
  Interactive Diffusion Based Smoothing and Segmentation of Volumetric Datasets on Graphics Hardware
  Methods of Information in Medicine 46(3), pp. 270-274, 2007
• Beyer, J., Hadwiger, M., Wolfsberger, S., Resk-Salama, Chr., Bühler, K.
  Segmentierungsfreie Visualisierung des Gehirns für direktes Volumen Rendering
  Bildverabeitung für die Medizin 2007, pp. 333- 337, Springer, 2007
  
• Kratz, A., Hadwiger, M., Splechtna, R., Fuhrmann, A., Bühler, K.
  GPU-Based High-Quality Hardware Volume Rendering For Virtual Environments
  Proceedings of International Workshop on Augmented Environments for Medical Imaging and Computer Aided Surgery (AMI-ARCS), Copenhagen, October 2006
• Wolfberger, S.; Neubauer, A.; Bühler, K.; Wegenkittl, R.; Czech, Th.; Gentzsch, S.; Böcher-Schwarz, H.-G.; Knosp, E.
  Advanced Virtual Endoscopy for Endoscopic Transsphenoidal Pituitary Surgery
  Neurosurgery 59(5), pp. 1001-1010, 2006
• Hadwiger, M.; Kratz, A.; Sigg, Chr.; Bühler, K.
  GPU-Accelerated Deep Shadow Maps for Direct Volume Rendering
  Proceedings of Siggraph/Eurographics Workshop on Graphics Hardware 2006, Eurographics.
• Zambal, S.; Hladůvka, J.; Bühler, K.
  Improving Segmentation of the Left Ventricle using a Two-Component Statistical Model
  Proceedings of Medical Image Computing and Computer-Assisted Intervention (MICCAI) 2006 
• Scharsach, H.; Hadwiger, M.; Neubauer, A.; Wolfsberger, S.; Bühler, K.
  Perspective Isosurface and Direct Volume Rendering for Virtual Endoscopy Applications
  Proceedings of Eurovis/IEEE-VGTC Symposium on Visualization 2006;
• Hladůvka, J.; Bühler, K.
  MDL Spline Models: Gradients and Polynomial Reparametrisations
  Proceedings of British Machine Vision Conference (BMVC) 2005
  September 5-8, 2005, Oxford, Great Britain.
• Hadwiger, M.; Sigg, Chr.; Scharsach, H.; Bühler, K.; Gross, M.;
  Real-Time Ray-Casting and Advanced Shading of Discrete Isosurfaces
  Proceedings of Eurographics 2005, pp. 303-312, 2005
  August 29 - September 02, 2005; Dublin, Ireland
• Viola, I.; Gröller, E.; Hadwiger, M.; Bühler, K.; Preim, B. and Ebert, D.
  Illustrative Visualization
  Tutorial Notes, Eurographics 2005, August 29 - September 02, 2005; Dublin, Ireland
• Neubauer, A. ; Bühler, K.; Wegenkittl, R., Rauchberger, A., Rieger, M.;
  Virtual Corrective Osteotomy.
  Proceedings of Computer Assisted Radiology and Surgery 2005; June 22 - 25, 2005 Berlin, Germany.
• Neubauer, A., Wolfsberger, S., Forster, M.-T., Mroz, L., Wegenkittl, R. and Bühler, K.;
  Advanced Virtual Endoscopic Pituitary Surgery.
  IEEE Transactions on Visualization and Computer Graphics, Vol. 11, No. 5, pp. 497-507. 2005
• Langer, C., Hadwiger, M. and Bühler K.;
  Interaktive diffusionsbasierte Segmentierung von Volumendaten auf Grafikhardware.
  Bildverarbeitung für die Medizin 2005, Informatik Aktuell, Springer. pp 168-172. 2005
• Bühler, K., Neubauer, A., Hadwiger, M. , Wolsfberger, S. and Wegenkittl, R.;
  Interactive 3D Techniques for Computer Aided Diagnosis and Surgery Simulation Tools.
  Digital (R)evolution in Radiology - Bridging the Future of Health Care, 2nd Edition; Hruby, W. (ed.); Springer Verlag. 2005
• Wolfsberger, S., Forster, M.-T., Donat, M., Neubauer, A., Bühler, K., Wegenkittl, R., Hainfellner, J., Knosp, E.;
  Virtual Endoscopy is a Useful Device for Training and Preoperative Planning of Transsphenoidal Endoscopic Pituitary Surgery.
  Minimally Invasive Neurosurgery 47(4); pp. 214-220. 2004
• Neubauer, André; Forster, Marie-Therese; Mroz,Lukas; Wegenkittl, Rainer; Bühler, Katja;
  STEPS - An Application for Simulation of Transsphenoidal Endonasal Pituitary Surgery;
  Proceedings of IEEE Visualization 2004, pp 513-520. 2004
• Felkel, P. , Wegenkittl, R. and Bühler, K.;
  Surface Models of Tube Trees;
  Proceedings of Computer Graphics International 2004, pp. 70.77. 2004
• Neubauer, A., Forster, M.-T., Wegenkittl, R., Mroz, L. and Bühler, K.
  Efficient Display of Background Objects for Virtual Endsocopy Using Flexible First-Hit Ray Casting;
  Proceedings of the Joint Eurographics - IEEE TCVG Symposium on Visualization (VisSym 2004), pp. 301-310. 2004
• Bühler, K., Felkel, P and La Cruz, A.;
  Geometric Methods for Vessel Visualization and Quantification - A Survey.
  Geometric Modelling for Scientific Visualization. G. Brunnet, B. Hamann and H. Müller (eds.). Kluwer Academic Publishers. pp 399-420. 2004
• Bühler, K., Dyllong, E., Luther, W.;
  Reliable Distance and Intersection Computation Using Finite Precision Geometry.
  Numerical software with result verification (Platforms, algorithms, applications in engineering, physics, and economics) R. Alt, A. Frommer, R. B. Kearfott, W. Luther (eds.). LNCS 2991, Springer. pp 160-190. 2004.
• Bühler, K.;
  Implicit Linear Interval Estimations.
  Proceedings of the 18th Spring Conference in Computer Graphics (SCCG'02), Budmerice, Slovakia. ACM Press. pp.123-132, 2002
• Bühler, K.;
  Fast and Reliable Plotting of Implicit Curves.
  Uncertainty in Geometric Computations; Joab Winkler, Mahesan Niranjan (eds.); Kluwer Academic Publishers. pp. 15-28, 2002
• Bühler, K.;
  Linear Interval Estimations for Parametric Objects - Theory and Applications. Proceedings of Eurographics 2001; A.Chalmers and T.-M. Rhyne (eds.); Computer Graphics Forum, 20(3), 2001.
• Bühler, K.;
  Taylor Models and Affine Arithmetics - Towards a More Sophisticated Use of Reliable Arithmetics in Computer Graphics. 
  Proceedings of the 17th Spring Conference in Computer Graphics (SCCG'01); Budmerice, Slovakia; IEEE; pp 40-48, 2001; 
• Bühler, K., Barth, W.;
  A New Intersection Algorithm for Parametric Surfaces Based on Linear Interval Estimations.
  Scientific Computing, Validated Numerics, Interval Methods, Walter Kämer, Jürgen Wolff von Gudenberg (eds.), Kluwer Academic Publishers, Boston/Dordrecht/London, 2001.
• Paluszny, M. and Bühler, K.,
  Canal Surfaces and Inversive Geometry.
  Daehlen, Morten (ed.) et al., Mathematical methods for curves and surfaces II. Vanderbilt Univ. Press. pp 367-374, 1998.

Theses

• Bühler, K.;
  A new subdivision algorithm for the intersection of parametric surfaces.
  PhD thesis,  Vienna University of Technology, June 2001.
• Bühler, K.,
  Rationale algebraische Kurven auf Dupinschen Zykliden
  Diplomarbeit, Universität Karlsruhe, Institut für graphische Datenverarbeitung, Prof. H. Prautzsch, September 1995.

Technical Reports (that differ from the refereed publications above)

• Hladuvka, J., Bühler, K. ;
  Polynomial Reparametrizations for 2D MDL Shape Modelling .
  TR-VRVis-2004-041. VRVis Vienna, 2004
• Hladuvka, J., Bühler, K. ;
  MDL Models - Implementation Issues.
  TR-VRVis-2004-040. VRVis Vienna, 2004
• Sigg, C., Hadwiger, M., Gross, M.; Bühler, K.;
  Real-Time High-Quality Rendering of Isosurfaces.
  TR-VRVis-2004-015. VRVis Vienna, 2004
• Hadwiger, M., Langer, C., Scharsach, H. and Bühler, K.;
  State of the Art Report 2004 on GPU-Based Segmentation.
  TR-VRVis-2004-017. VRVis Vienna, 2004
• Paluszny, A., Bühler, K. Wegenkittl, R.;
  A prototype for 2D biomechanics-based preoperative planning of THA - Technical description.
  TR VRVis 2003 016. VRVis Vienna, 2003
• Bühler, K.;
  Über den Schnitt zweier Linearer Intervallabschätzungen.
  Technical Report TR-186-2-01-07. Vienna University of Technology, 2001

Poster/Extended Abstracts/Misc.

• Wolfsberger, S.; Donat, M.; Neubauer, A.; Bühler, K.; Czech, T. and Knosp, E.
  Virtuelle Endoskopie in der transsphenoidalen Hypophysenchirurgie
  CURAC Jahrestagung 2005, Berlin
  
• Langer, C., Hadwiger, M. and Bühler K.;
  Interaktive diffusionsbasierte Volumssegmentierung auf Grafikhardware;
  Poster, Bildverarbeitung für die Medizin 2005, Heidelberg
• Wolfsberger, S., Donat, M., Forster, M.-T., Neubauer, A., Bühler, K., Czech, T. and Knosp, E.;
  Virtuelle Endoskopie in der transsphenoidalen Hypophysenchirurgie;
  Abstract, Journal für Neurologie, Neurochirurgie und Psychatrie 5, Sonderheft 1/2004, p 13. 2004
• Bühler, K.;
  Linear Interval Estimations - Reliable Bounds for Implicit Curves and Surfaces. Extended Abstract and Poster.  Workshop on Uncertainty in Geometric Computations. Sheffield, July 2001
• Bühler, K., Barth, W.;
  A New Intersection Algorithm for Parametric Surfaces Based on Linear Interval Estimations,
  Abstract, Proceedings of SCAN 2000 - International Symposium on Scientific Computing, Computer Arithmetics and Validated Numerics;
  Karlsruhe,Germany, September 18.-22., 2000.
• Bühler, K., Barth, W.;
  Intersecting Parametric Surfaces Using Special Arithmetics;
  extended Abstract; Alhambra 2000 Conference; Granada, Spain, July 3. - 7., 2000.

• From STEPS to "free style" direct volume rendering: High quality real time visualization for planning of neurosurgical interventions.
  Invited Talk, Neurozentrum, Friedrich-Alexander-Universität Erlangen. 8.6.2006
• High Quality Real Time Visualization of Medical Data for Preoperative Planning of Neurosurgical Interventions - Technique, Potential and Limits.
  Invited Talk, Department for Neurosurgery, Medical University Vienna. 4.5.2006
• Advanced Visualization Techniques for Applications in Neurosurgery
  Talk, ACV Colloquium, Institute of Discrete Mathematics and Geometry, Vienna University of Technology. 16.12.2005
• High quality real time visualization of medical data.
  Talk, Meeting AK MedVis Berlin. 24.9.2005
• High quality real time visualization of medical data and other 3D techniques for neurosurgical applications, therapy planning and computer aided diagnosis.
  Invited Talk, University Magdeburg, Germany, 20.9.2005
• Illustrative Visualization - Human Visual Perception and Illustrative Aspects of Art.
  Tutorial Talk Eurographics 2005, Dublin, Ireland. 30.8.2005
• Virtuelle Planung und Training endoskopischer Hypophysenchirurgie.
  Invited Talk, Interdisziplinären Bildverarbeitungskolloquiums des Forschungszentrums Jülich, Germany, 28.6.2005
• Advanced Virtual Endoscopy for Planning and Training of Pituitary Surgery.
  Invited Talk, Freitagskolloquium Computer Graphik, Universität Tübingen, Germany, 10.6.2005
• On the challenge developing real world medical applications.
  Tutorial, Afrigraph 2004, Stellenbosch, South Africa. 3.11.2004
• A Career in Medical Visualization.
  ACM Siggraph Women in Computer Graphics Tour 2004.
• Surface Models of Tube Trees.
  Computer Graphics International, Crete, 17.7. 2004
• Linear Interval Estimations - A New Kind of Bounding Volumes for Implicit and Parametric Objects.
  Seminar on Numerical Software with Result Verification, Schloss Dagstuhl 19.-24.1.2003
• Total Hip Arthroplasty. Challenges for simulation, visualization, and process optimization.
  Graphics Lunch. ETH Zürich. 4.12.2002
• Implicit Linear Interval Estimations.
  SCCG 2002, Spring Conference on Computer Graphics, Budmerice, Slovakia, 2002.
• Linear Interval Estimations - A New Kind of Bounding Volumes for Implicit and Parametric Objects.
  Invited Talk, TU Braunschweig. 5.12.2001
• Linear Interval Estimations. 
  Invited Talk, University of Girona, 14.11.2001
• Linear Interval Estimations for Parametric Objects - Theory and Applications.
  Eurographics 2001, Manchester, UK, September 4.-7. 2001.
• Taylor Models and Affine Arithmetics - Towards a More Sophisticated Use of Reliable Arithmetics in Computer Graphics.
  SCCG 2001, Spring Conference on Computer Graphics, Budmerice, Slovakia, 2001.
• A New Intersection Algorithm for Parametric Surfaces Based on Linear Interval Estimations.
  SCAN 2000 - International Symposium on Scientific Computing, Computer Arithmetics and Validated Numerics; Karlsruhe,Germany, September 18.-22., 2000.
• Intersecting Parametric Surfaces Using Special Arithmetics.
  Alhambra 2000 Conference; Granada, Spain July 3. - 7., 2000.

• Best Poster Award, CURAC Jahrestagung 2005
• Best Applications Paper Award IEEE Visualization 2004
• Springer Best Paper Award, SCCG 2002
• Springer Best Papers Award, SCCG 2001

@Vienna University of Technology

Running:

• Visualisierung medizinischer Daten 2
• Betreuung von Praktika, Bakkalaureats-, Magister-, und Diplomarbeiten, sowie Dissertationen

Former:

• Mathematische Methoden in der Computergraphik
• Computergraphik 1
• Algorithmen und Datenstrukturen
• Java Einführung
• Rekursive Prozeduren und flexible Datenstrukturen
• Proseminar: CAGD, VR
• Forschungsseminar

@ Donau University Krems

• Bildmangement - Medizinische Visualisierung