Stephen L. Keeling

Institute for Mathematics and Scientific Computing
Karl-Franzens University of Graz
A-8010 Graz, Austria

homepage, teaching


Selected Publications:

 
  1. Keeling, S.L. and Geretschläger, R, Using Variational and PDE Methods for the Existence of Origami Models with Given Boundary Conditions, Proceedings of 7OSME, 2018. paper, presentation.
  2. Fürtinger, S. and Keeling, S.L., Existence of Minimizers for a Non-Convex Image Registration Functional with Applications to Edge Set Matching.
  3. Keeling, S.L., Katsaounis, T.D. and Plexousakis, M., Consistent Discretizations for Vanishing Regularization Solutions to Image Processing Problems. pdf
  4. Keeling, S.L. and Kunisch, K., Robust L1 Approaches to Computing the Geometric Median and Principal and Independent Components, Journal of Mathematical Imaging and Vision, Vol. 40, No. 1, pp. 120-145, 2011. pdf
  5. Reishofer, G., Koschutnig, K., Langkammer, C., Porter, D., Jehna, M., Enzinger, C., Keeling, S.L. and Ebner, F., Time-optimized high-resolution readout-segmented diffusion tensor imaging. PLoS One, Vol. 8, No. 9, Sep 3, 2013.
  6. Reishofer, G., Koschutnig, K., Enzinger, C., Ischebeck, A., Keeling, S.L., Stollberger, R. and Ebner, F., Automated macrovessel artifact correction in dynamic susceptibility contrast magnetic resonance imaging using independent component analysis, Magn Reson Med. Vol. 65, No. 3, pp. 848 - 857, 2011.
  7. Hofer, M. Keeling, S.L., Reishofer, G., Stollberger, R., Rectal Tumor Registration based on Virtual Templates, ISPA 2011, Dubrovnik, Croatia, Sept. 4 - 6, 2011.
  8. Hofer, M., Reishofer, G., Keeling, S.L., Riccabona, M., Aschauer, M. and Stollberger, R., Virtual Template Registration for DCE-MRI Renography, ISMRM Annual Meeting, Montreal, Canada, 7. - 13. Mai, 2010.
  9. Fürtinger, S. Keeling, S.L., Plank, G., Prassel, A.J., Registration of Edges Sets for Mapping a Purkinje Fiber Network onto an Endocardium, SFB-Report 2010-036, Graz, Austria, 2010. pdf
  10. Kasumba, H. Keeling, S.L., Müller, M., Decay Estimate Addendum to: Revision of the Theory of Tracer Transport and the Convolution Model of DCE-MRI, SFB-Report 2010-022, Graz, Austria, 2010. Submitted to Journal of Mathematical Biology. pdf
  11. Prassl, A.J., Keeling, S.L., Hofer, E., Plank, G., Reintegration of an endocardial Purkinje system into an anatomically realistic 3D rabbit ventricular geometry, BMT Annual Meeting, 2010.
  12. Keeling, S.L., Hintermüller, M., Knoll, F., Kraft, D., Laurain, A., A Total Variation Based Approach to Correcting Surface Coil Magnetic Resonance Images, SFB-Report 2010-016, Graz, Austria, 2010. To appear in Applied Mathematics and Computation. pdf
  13. Keeling, S.L., Propst, G., Stadler, G, Wackernagel, W., A Mathematical Model of the Deformation of the Eyeball by an Elastic Band, Mathematical Medicine and Biology, Vol. 29, pp. 165-183, 2009. Also appeared as SFB-Report 2009-002, Graz, Austria, 2009. pdf
  14. Hintermüller, M., Keeling, S.L., Image registration and segmentation based on energy minimization, in Handbook of Optimization in Medicine, Series: Springer Optimization and its Applications, Vol. 26, Pardalos, P.M., Romeijn, H.E. (editors), 2009. pdf
  15. Keeling, S.L., Kogler, T., Stollberger, R., Deconvolution for DCE-MRI Using an Exponential Approximation Basis, Medical Image Analysis, Vol. 13, pp. 80-90, 2009. pdf
  16. Hintermüller, M., Keeling, S.L., Laurain, A., Modulation recovery and image reconstruction in MRI: a structural study by parameterization, SFB-Report 2008-023, Graz, Austria, 2008. pdf
  17. Keeling, S.L., Clason, C., Hintermüller, M., Knoll, F., Laurain, A., Von Winckel, G., An Image Space Approach to Cartesian Based Parallel MR Imaging with Total Variation Regularization, SFB-Report 2008-022, Graz, Austria, 2008. To appear in Medical Image Analysis. pdf
  18. Keeling, S.L., Generalized Rigid and Generalized Affine Image Registration and Interpolation by Geometric Multigrid, Journal of Mathematical Imaging and Vision, Vol. 29, pp. 163-183, 2007. pdf
  19. Keeling, S.L., Image Similarity Based on Intensity Scaling, Journal of Mathematical Imaging and Vision, Vol. 29, pp. 21-34, 2007. pdf
  20. Keeling, S.L., Haase, G., Geometric Multigrid for High-Order Regularizations of Early Vision Problems, Applied Mathematics and Computation, Vol. 184, pp. 536-556, 2007. pdf
  21. Reishofer, G., Fazekas, F., Keeling, S.L., Enzinger, C., Payer, F., Simbrunner, J., Stollberger, R., Minimizing Macrovessel Signal in Cerebral Perfusion Imaging using Independent Component Analysis, Magnetic Resonance in Medicine, Vol. 57, No. 2, pp. 278 - 288, 2007.
  22. Keeling, S.L., Bammer, R., Stollberger, R., Revision of the Theory of Tracer Transport and the Convolution Model of Dynamic Contrast Enhanced Magnetic Resonance Imaging, Journal of Mathematical Biology, Vol. 55, pp. 389-411, 2007. pdf
  23. Keeling, S.L., Regularization Formulations and Numerical Solutions for Image Processing, Habilitation Summary, accepted by the Karl-Franzens-Universität Graz, 2006. pdf
  24. Keeling, S.L., Medical Image Registration and Interpolation by Optical Flow with Maximal Rigidity, in Mathematical Models for Registration and Applications to Medical Imaging, Scherzer, O. (editor), Springer, Berlin, 2006.
  25. Burton, R., Plank, G., Schneider, J.E., Grau, V., Ahammer, H. Keeling, S.L., Lee, J., Smith, N., Gavaghan, D., Trayanova, N. and Kohl, P., Three-Dimensional Models of Individual Cardiac Histo-Anatomy: Tools and Challenges, Annals of the New York Academy of Sciences, Vol. 1080 No. 4, pp. 301-319, October 2006. [Fulltext] [PubMed]
  26. Keeling, S.L., Ring, W., Medical Image Registration and Interpolation by Optical Flow with Maximal Rigidity, Journal of Mathematical Imaging and Vision, Vol. 23, No. 1, pp. 47-65, July 2005. Also appeared as SFB Report No. 248, Karl-Franzens-University of Graz, Graz, Austria, May, 2003. pdf
  27. Keeling, S.L., Bammer, R., Kogler, T., Stollberger, R., On the Convolution Model of Dynamic Contrast Enhanced Magnetic Resonance Imaging and Nonparametric Deconvolution Approaches, SFB Report No. 298, Karl-Franzens-University of Graz, Graz, Austria, April, 2004.
  28. Reishofer, G., Enzinger, C., Fazekas, F., Keeling, S.L., Stollberger, R., Improved Visibility of Hemodynamic Parameter Maps Using ICA Corrected DCE-MRI Time Series, International Society for Magnetic Resonance in Medicine Workshop on Quantitative Cerebral Perfusion Imaging Using MRI: A Technical Perspective, Venice, Italy, March 21-23, 2004.
  29. Keeling, S.L. and Bammer, R., A Variational Approach to Magnetic Resonance Coil Sensitivity Estimation, Applied Mathematics and Computation, Vol. 158, No. 2, pp. 53-82, 2004. Also appeared in part as SFB Report No. 207, Karl-Franzens-University of Graz, Graz, Austria, December 2000. pdf
  30. Keeling, S.L., Total Variation Based Convex Filters for Medical Imaging, Applied Mathematics and Computation, Vol. 139, pp. 101-119, 2003. Also appeared as SFB Report No. 206, Karl-Franzens-University of Graz, Graz, Austria, December 2000. pdf
  31. Keeling, S.L. and Stollberger, R., Nonlinear Anisotropic Diffusion Filters for Multiscale Edge Enhancement, Inverse Problems, Vol. 18, pp. 175-190, January 2002. Also appeared as SFB Report No. 180, Karl-Franzens-University of Graz, Graz, Austria, January 2000, and in part at SPIE International Symposium on Medical Imaging, San Diego, CA, February 12-18, 2000. pdf
  32. Bammer, R., M. Auer, Keeling, S.L., M. Augustin, L.A. Stables, R.W. Prokesch, R. Stollberger, M.E. Moseley, F. Fazekas, Diffusion Tensor Imaging Using Single-Shot SENSE-EPI, Magnetic Resonance in Medicine, Vol. 48, No. 1, pp. 128-136, July 2002.
  33. Bammer, R., Keeling, S.L., Augustin, M., Pruessmann, K.P., Wolf, R., Stollberger, R., Hartung, H., Fazekas, F., Improved Diffusion-Weighted Single-Shot Echo-Planar Imaging in Stroke using Sensitivity Encoding, Magnetic Resonance in Medicine, Vol. 46, No. 3, pp 548-554, September 2001.
  34. Keeling, S.L. and Bammer, R., Variational Based Coil Sensitivity Estimation, Annual Meeting of the International Society for Magnetic Resonance in Medicine, Glasgow, April 21-27, 2001.
  35. Bammer, R., Keeling, S.L., Auer, M., Pruessmann, K.P., Roeschmann, P., Stollberger, R., Fazekas, F., Diffusion Tensor Imaging using SENSE-Single-Shot EPI, Annual Meeting of the International Society for Magnetic Resonance in Medicine, Glasgow, April 21-27, 2001.
  36. Bammer, R., Keeling, S.L., Augustin, M., Pruessmann, K.P., Leussler, C., Fazekas, F., Improved Diffusion-Weighted Single-Shot EPI in Stroke using SENSE, Annual Meeting of the International Society for Magnetic Resonance in Medicine, Glasgow, April 21-27, 2001.
  37. Keeling, S.L., Bammer, R., Fazekas, F., and Stollberger, R., Total Variation Denoising for Improved Diffusion Tensor Calculation, Annual Meeting of International Society for Magnetic Resonance in Medicine, Denver, CO, April 1-7, 2000.
  38. Bowers, P.L., Dietz, W.E. and Keeling, S.L., Fast Algorithms for Generating Delaunay Interpolation Elements for Domain Decomposition, SFB Report No. 139, Karl-Franzens-University of Graz, Graz, Austria, September, 1998.
  39. B.G. Fitzpatrick and S.L. Keeling, On Approximation in Total Variation Penalization for Image Reconstruction, Numerical Functional Analysis and Optimization, Vol. 18, Nos. 9 and 10, pp. 941 - 958, 1997. pdf
  40. Keeling, S.L., Tramel, R.W. and Benek, J.A., A Theoretical Framework for Chimera Domain Decomposition, Advances in Flow Simulation Techniques-a Conference Dedicated to the Memory of Professor Joseph L. Steger, UC Davis, May 2-4, 1997. pdf
  41. Dietz, W.E., Donegan, T.L., Keeling, S.L. and Thoms, R.D., A Generalization of the Chimera Method to Arbitrary Mesh Structures and Interfaces, Third Symposium on Overset Composite Grid and Solution Technology, Los Alamos, NM, November 18-20, 1996.
  42. Banks, H.T., Keeling, S.L., Silcox, R.J., Active Control of Propeller Induced Noise Fields, CRSC Report No. CRSC-TR94-16, North Carolina State University, Raleigh, NC, October, 1994, appeared in part in Proceedings of the IEEE Twenty-Seventh Conference on Decision and Control, Austin, Texas, December 7-9, 1988. pdf
  43. Keeling, S.L., A Strategy for the Optimal Design of Nozzle Contours, Paper No. AIAA-93-2720, AIAA 28th Thermophysics Conference, Orlando, FL, July 6-9, 1993. Best Paper Award. pdf
  44. Keeling, S.L., On Lipschitz Continuity of Nonlinear Differential Operators, SIAM Journal of Numerical Analysis, Vol. 27, No. 2, pp. 385-393, April 1990. pdf
  45. Keeling, S.L., Galerkin/Runge-Kutta Discretizations for Semilinear Parabolic Equations, SIAM Journal Numerical Analysis, Vol. 27, No. 2, pp. 394-418, April 1990. pdf
  46. Keeling, S.L., On Implicit Runge-Kutta Methods Having a Stability Function with Only Real Poles, BIT, Vol. 29, pp. 91-109, 1989. pdf
  47. Keeling, S.L., Galerkin/Runge-Kutta Discretizations for Parabolic Equations with Time Dependent Coefficients, Mathematics of Computation, Vol. 52, No. 186, pp. 561-586, April 1989. pdf