Dr. Karl Fritscher Profile

Dr. Karl Fritscher

at CubileHealth GmbH

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Author

Publications (9)

Proceedings Article | 15 March 2011 Paper

Whole vertebral bone segmentation method with a statistical intensity-shape model based approach

Shouhei Hanaoka, Karl Fritscher, Benedikt Schuler, Yoshitaka Masutani, Naoto Hayashi, Kuni Ohtomo, Rainer Schubert

Proceedings Volume 7962, 796242 (2011) https://doi.org/10.1117/12.878151

KEYWORDS: Image segmentation, Spine, Statistical modeling, Bone, Data modeling, Detection and tracking algorithms, Computed tomography, Statistical analysis, Principal component analysis, Medical imaging

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Proceedings Article | 2 March 2011 Paper

A novel class of machine-learning-driven real-time 2D/3D tracking methods: texture model registration (TMR)

Philipp Steininger, Markus Neuner, Karl Fritscher, Felix Sedlmayer, Heinrich Deutschmann

Proceedings Volume 7964, 79640G (2011) https://doi.org/10.1117/12.878147

KEYWORDS: Image registration, Medical imaging, 3D image processing, 3D acquisition, Data modeling, Machine learning, 3D modeling, X-rays, Radiography, Radiotherapy

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Proceedings Article | 13 March 2010 Paper

Model guided diffeomorphic demons for atlas based segmentation

K. Fritscher, B. Schuler, T. Roth, Ch. Kammerlander, M. Blauth, R. Schubert

Proceedings Volume 7623, 762306 (2010) https://doi.org/10.1117/12.844134

KEYWORDS: Image segmentation, Image registration, Statistical modeling, Image processing algorithms and systems, Data modeling, Image processing, Medical imaging, Statistical analysis, Process modeling, Image quality

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Proceedings Article | 13 March 2010 Paper

3D bone mineral density distribution and shape reconstruction of the proximal femur from a single simulated DXA image: an in vitro study

Tristan Whitmarsh, Ludovic Humbert, Mathieu De Craene, Luis del Río Barquero, Karl Fritscher, Rainer Schubert, Felix Eckstein, Thomas Link, Alejandro Frangi

Proceedings Volume 7623, 76234U (2010) https://doi.org/10.1117/12.844110

KEYWORDS: Dual energy x-ray absorptiometry, Bone, 3D image reconstruction, 3D modeling, 3D image processing, Data modeling, Statistical analysis, Image registration, Minerals, In vitro testing

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Proceedings Article | 13 March 2009 Paper

Using a statistical appearance model to predict the fracture load of the proximal femur

Benedikt Schuler, Karl Fritscher, Volker Kuhn, Felix Eckstein, Rainer Schubert

Proceedings Volume 7261, 72610W (2009) https://doi.org/10.1117/12.811557

KEYWORDS: Bone, Statistical modeling, Principal component analysis, Image registration, Image segmentation, Computed tomography, 3D modeling, Medical imaging, Image resolution, Finite element methods

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Proceedings Article | 26 March 2008 Paper

3D inters-subject cardiac registration using 4D information

Alfredo Lopez, Karl Fritscher, Thomas Trieb, Rainer Schubert, Julian Mattes

Proceedings Volume 6914, 691413 (2008) https://doi.org/10.1117/12.771386

KEYWORDS: Image registration, 3D image processing, Image segmentation, 3D acquisition, Heart, Medical imaging, Astatine, Single photon emission computed tomography, Image restoration, Control systems

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In this paper we present a new approach for the registration of cardiac 4D image sequences of different subjects, where we assume that a temporal association between the sequences is given. Moreover, we allow for one (or two) selected pair(s) of associated points in time of both sequences, which we call the bridging points in time, the use of additional information such as the semi-automatic segmentation of the investigated structure. We establish the 3D inter-subject registration for all other pairs of points in time exploiting (1) the inter-subject registration for the bridging pair of points in time, (2) the intra-subject motion calculation in both sequences with respect to the bridging pair, and (3) the concatenation of the obtained transformations. We formulate a cost functional integrating the similarity measures comparing the images of the bridging pair(s) of points in time and of the current pair of points in time, respectively. We evaluated our algorithm on 8 healthy volunteers leading to 28 inter-subject combinations and we analyze the behaviour for different parameter settings weighting differently the involved pairs of points in time. The approach based on the bridging pairs outperforms a direct 3D registration of corresponding points in time, in particular in the right ventricle we gain up to 33% in registration accuracy. Starting with a cost functional taking into account the similarity at the first bridging point in time, the results improve stepwise by integrating, firstly, information from the current pair of points in time and secondly, from a second bridging point in time. Our results also show a steep rise of the importance of regularization on the registration accuracy when registering the current point in time with our procedure (17% gain in accuracy) with respect to a direct registration in the bridging point (less than 1%). However, regularization during intra-sequence registration had only minor effects on the accuracy of our registration procedure.

Proceedings Article | 30 March 2007 Paper

Assessment of femoral bone quality using co-occurrence matrices and adaptive regions of interest

Karl David Fritscher, Benedikt Schuler, Agnes Grünerbl, Markus Hänni, Karsten Schwieger, Norbert Suhm, Rainer Schubert

Proceedings Volume 6514, 65141K (2007) https://doi.org/10.1117/12.709371

KEYWORDS: Bone, Matrices, Image quality, Image segmentation, Computed tomography, Medical imaging, Adaptive optics, Diagnostics, Surgery, Spatial resolution

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Proceedings Article | 10 March 2006 Paper

Quantification of the migration and deformation of abdominal aortic aneurysm stent grafts

Julian Mattes, Iris Steingruber, Michael Netzer, Karl Fritscher, Helmut Kopf, Werner Jaschke, Rainer Schubert

Proceedings Volume 6144, 61440V (2006) https://doi.org/10.1117/12.653990

KEYWORDS: Image segmentation, Image registration, Medical imaging, Image processing, Computed tomography, 3D visualizations, Arteries, Feature extraction, Blood circulation, Lithium

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Proceedings Article | 29 April 2005 Paper

A software framework for preprocessing and level set segmentation of medical image data

Karl David Fritscher, Rainer Schubert

Proceedings Volume 5747, (2005) https://doi.org/10.1117/12.592339

KEYWORDS: Image segmentation, Image filtering, Image processing algorithms and systems, Algorithm development, Image processing, Medical imaging, Image registration, Software frameworks, Data modeling, 3D image processing

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Showing 5 of 9 publications

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