Cocepts and Results in the Development of a Hybrid Tracking System for Computer Aided Surgery. - Wolfgang Birkfellner; Franz Watzinger; Felix Wanschitz; Georg Enislidis; Michael Truppe; Rolf Ewers; Helmar Bergmann (MICCAI, 1998)

Calibration of tracking systems in a surgical environment. - Wolfgang Birkfellner; Franz Watzinger; Felix Wanschitz; Rolf Ewers; Helmar Bergmann (IEEE Trans. Medical Imaging, 1998)

Computer-Aided Implant Dentistry - An Early Report. - Wolfgang Birkfellner; Peter Solar; André Gahleitner; Klaus Huber; Franz Kainberger; Joachim Kettenbach; Peter Homolka; Markus Diemling; Georg Watzek; Helmar Bergmann (MICCAI, 1999)

Development of the Varioscope AR. A see-through HMD for computer-aided surgery. - Wolfgang Birkfellner; Klaus Huber; Franz Watzinger; Franz Figl; Felix Wanschitz; Rudolf Hanel; Dietmar Rafolt; Rolf Ewers; Helmar Bergmann (ISAR, 2000)

The Varioscope AR - A Head-Monted Operating Microscope for Augmented Reality. - Wolfgang Birkfellner; Michael Figl; Klaus Huber; Franz Watzinger; Felix Wanschitz; Rudolf Hanel; Arne Wagner; Dietmar Rafolt; Rolf Ewers; Helmar Bergmann (MICCAI, 2000)

Accuracy of a Navigation System for Computer-Aided Oral Implantology. - Wolfgang Birkfellner; Felix Wanschitz; Franz Watzinger; Klaus Huber; Michael Figl; Christian Schopper; Rudolf Hanel; Franz Kainberger; Joachim Kettenbach; Sanda Patruta; Rolf Ewers; Helmar Bergmann (MICCAI, 2000)

A Modular Software System for Computer Aided Surgery and Its First Application in Oral Implantology. - Wolfgang Birkfellner; Klaus Huber; Alan Larson; Dennis P. Hanson; Markus Diemling; Peter Homolka; Helmar Bergmann (IEEE Trans. Medical Imaging, 2000)

Calibration of a head-mounted operating microscope for augmented reality visualization in CAS. - Wolfgang Birkfellner; Michael Figl; Klaus Huber; Franz Watzinger; Felix Wanschitz; Rudolf Hanel; Johann Hummel; Rolf Ewers; Helmar Bergmann (CARS, 2001)

Fusion of MR and CT scans of the pelvis in cases of malignant bone tumors. - Wolfgang Birkfellner; Eva Schwameis; Friedrich Vorbeck; Rudolf Hanel; Wolfgang Greimel; Johann Hummel; Michael Figl; Franz Kainberger; Herwig Imhof; Rainer Kotz; Helmar Bergmann (CARS, 2001)

Current Status of the Varioscope AR, a Head-Mounted Operating Microscope for Computer-Aided Surgery. - Michael Figl; Wolfgang Birkfellner; Johann Hummel; Rudolf Hanel; Peter Homolka; Franz Watzinger; Felix Wanschitz; Rolf Ewers; Helmar Bergmann (ISAR, 2001)

Calibration of projection parameters in the varioscope AR, a head-mounted display for augmented-reality visualization in image-guided therapy. - Wolfgang Birkfellner; Michael Figl; Klaus Huber; Johann Hummel; Rudolf A. Hanel; Peter Homolka; Franz Watzinger; Felix Wanschitz; Rolf Ewers; Helmar Bergmann (Image-Guided Procedures, 2001)

The Control Unit for a Head Mounted Operating Microscope Used for Augmented Reality Visualization in Computer Aided Sugery. - Michael Figl; Wolfgang Birkfellner; Christopher Ede; Johann Hummel; Rudolf Hanel; Franz Watzinger; Felix Wanschitz; Rolf Ewers; Helmar Bergmann (ISMAR, 2002)

Stereoscopic visualization in the varioscope AR: a see-through head-mounted display for surgical navigation. - Wolfgang Birkfellner; Michael Figl; Christian Matula; Johann Hummel; Rudolf A. Hanel; Herwig Imhof; Felix Wanschitz; Arne Wagner; Franz Watzinger; Helmar Bergmann (Image-Guided Procedures, 2002)

PC-based control unit for a head-mounted operating microscope for augmented-reality visualization in surgical navigation. - Michael Figl; Wolfgang Birkfellner; Franz Watzinger; Felix Wanschitz; Johann Hummel; Rudolf A. Hanel; Rolf Ewers; Helmar Bergmann (Image-Guided Procedures, 2002)

Laboratory assessment of a miniature electromagnetic tracker. - Johann Hummel; Wolfgang Birkfellner; Michael Figl; C. Haider; Rudolf Hanel; Helmar Bergmann (Image-Guided Procedures, 2002)

A Head-Mounted Operating Binocular for Augmented Reality Visualization in Medicine - Design and Initial Evaluation. - Wolfgang Birkfellner; Michael Figl; Klaus Huber; Franz Watzinger; Felix Wanschitz; Johann Hummel; Rudolf Hanel; Wolfgang Greimel; Peter Homolka; Rolf Ewers; Helmar Bergmann (IEEE Trans. Medical Imaging, 2002)

Interactive localisator for percutaneous interventions. - Gernot Kronreif; Martin Fürst; Joachim Kettenbach; Michael Figl; Wolfgang Birkfellner; Rudolf Hanel (CARS, 2003)

LORENZ: a system for planning long-bone fracture reduction. - Wolfgang Birkfellner; Wolfgang Burgstaller; Joachim Wirth; Bernard Baumann; Augustinus Ludwig Jacob; Kurt Bieri; Stefan Traud; Michael Strub; Pietro Regazzoni; Peter Messmer (Image-Guided Procedures, 2003)

Rotation invariance principles in 2D/3D registration. - Wolfgang Birkfellner; Joachim Wirth; Wolfgang Burgstaller; Bernard Baumann; Harald Staedele; Beat Hammer; Nils-Claudius Gellrich; Augustinus Ludwig Jacob; Pietro Regazzoni; Peter Messmer (Image-Guided Procedures, 2003)

Calibration of an optical see-through head-mounted display with variable zoom and focus for applications in computer-assisted interventions. - Michael Figl; Wolfgang Birkfellner; Johann Hummel; Christopher Ede; Rudolf Hanel; Helmar Bergmann (Image-Guided Procedures, 2003)

Navigation system for flexible endoscopes. - Johann Hummel; Michael Figl; Wolfgang Birkfellner; Michael Häfner; Christian Kollmann; Helmar Bergmann (Image-Guided Procedures, 2003)

A similarity measure based on Tchebichef moments for 2D/3D medical image registration. - Xinhui Yang; Wolfgang Birkfellner; Peter Niederer (CARS, 2004)

Automatic calibration of an optical see-through head-mounted display for augmented reality applications in computer-assisted interventions. - Michael Figl; Christopher Ede; Wolfgang Birkfellner; Johann Hummel; Rudolf Seemann; Helmar Bergmann (Image-Guided Procedures, 2004)

Hybrid tracking system for flexible endoscopes. - Johann Hummel; Michael Figl; Wolfgang Birkfellner; Christopher Ede; Rudolf Seemann; Helmar Bergmann (Image-Guided Procedures, 2004)

2D/3D registration using a rotation-invariant cost function based on Zernike moments. - Wolfgang Birkfellner; Xinhui Yang; Wolfgang Burgstaller; Bernard Baumann; Augustinus Ludwig Jacob; Peter F. Niederer; Pietro Regazzoni; Peter Messmer (Image Processing, 2004)

Fast DRR Generation for 2D/3D Registration. - Wolfgang Birkfellner; Rudolf Seemann; Michael Figl; Johann Hummel; Christopher Ede; Peter Homolka; Xinhui Yang; Peter Niederer; Helmar Bergmann (MICCAI (2), 2005)

Design and automatic calibration of a head mounted operating binocular for augmented reality applications in computer-aided surgery. - Michael Figl; Christopher Ede; Wolfgang Birkfellner; Johann Hummel; Rudolf Hanel; Helmar Bergmann (Image-Guided Procedures, 2005)

Standardized evaluation method for electromagnetic tracking systems. - Johann Hummel; Calvin R. Maurer Jr.; Michael Figl; Michael R. Bax; Helmar Bergmann; Wolfgang Birkfellner; Ramin Shahidi (Image-Guided Procedures, 2005)

A fully automated calibration method for an optical see-through head-mounted operating microscope with variable zoom and focus. - Michael Figl; Christopher Ede; Johann Hummel; Felix Wanschitz; Rolf Ewers; Helmar Bergmann; Wolfgang Birkfellner (IEEE Trans. Medical Imaging, 2005)

Endoscopic navigation system using 2D/3D registration. - Johann Hummel; Michael Figl; Helmar Bergmann; Wolfgang Birkfellner (Image-Guided Procedures, 2006)

Stochastic rank correlation for slice-to-volume registration of fluoroCT/CT imaging. - Wolfgang Birkfellner; Michael Figl; Helmar Bergmann (Image-Guided Procedures, 2007)

Motion correction for radiation therapy of prostate using B-mode ultrasound. - Johann Hummel; Michael Figl; Jörg Schmidbauer; Martina Tinzl; Helmar Bergmann; Wolfgang Birkfellner (Image-Guided Procedures, 2007)

The Zernike Expansion - An Example of a Merit Function for 2D/3D Registration Based on Orthogonal Functions. - Shuo Dong; Joachim Kettenbach; Isabella Hinterleitner; Helmar Bergmann; Wolfgang Birkfellner (MICCAI (2), 2008)

Evaluation of dynamic electromagnetic tracking deviation. - Johann Hummel; Michael Figl; Michael R. Bax; Ramin Shahidi; Helmar Bergmann; Wolfgang Birkfellner (Image-Guided Procedures, 2009)

Correction of prostate misalignment in radiation therapy using US-CT registration. - Rainer Hoffmann 001; Michael Figl; Marcus Kaar; Amon Bhatia; Amar Bhatia; Wolfgang Birkfellner; Johann Hummel (Image-Guided Procedures, 2010)

Measurement of complex joint trajectories using slice-to-volume 2D/3D registration and cine MR. - Christoph Bloch; Michael Figl; Christelle Gendrin; Christoph Weber; Ewald Unger; S. Aldrian; Wolfgang Birkfellner (Image-Guided Procedures, 2010)

A comment on the rank correlation merit function for 2D/3D registration. - Michael Figl; Christoph Bloch; Wolfgang Birkfellner (Image-Guided Procedures, 2010)

Towards real-time 2D/3D registration for organ motion monitoring in image-guided radiation therapy. - Christelle Gendrin; Jakob Spoerk; Christoph Bloch; Supriyanto A. Pawiro; Christoph Weber; Michael Figl; Primoz Markelj; Franjo Pernus; Dietmar Georg; Helmar Bergmann; Wolfgang Birkfellner (Image-Guided Procedures, 2010)

A new gold-standard dataset for 2D/3D image registration evaluation. - Supriyanto A. Pawiro; Primoz Markelj; Christelle Gendrin; Michael Figl; Markus Stock; Christoph Bloch; Christoph Weber; Ewald Unger; Iris Nöbauer; Franz Kainberger; Helga Bergmeister; Dietmar Georg; et al. (Image-Guided Procedures, 2010)

Comparison of two navigation system designs for flexible endoscopes using abdominal 3D ultrasound. - Marcus Kaar; Rainer Hoffmann 001; Helmar Bergmann; Michael Figl; Christoph Bloch; Alfred Kratochwil; Wolfgang Birkfellner; Johann Hummel (Image-Guided Procedures, 2011)

Elektromagnetisches Tracking für die interventionelle Radiologie - Genauigkeitsuntersuchung und in-vitro Applikation eines neuen Feldgenerators. - Alfred M. Franz; Mark Servatius; Alexander Seitel; Johann Hummel; Wolfgang Birkfellner; Laura Bartha; Heinz-Peter Schlemmer; Christof M. Sommer; Boris A. Radeleff; Hans-Ulrich Kauczor; Hans-Peter Meinzer; Lena Maier-Hein (Bildverarbeitung für die Medizin, 2012)

Real-Time Intensity Based 2D/3D Registration for Tumor Motion Tracking During Radiotherapy. - Hugo Furtado; Christelle Gendrin; Christoph Bloch; Jakob Spoerk; Suprianto A. Pawiro; Christoph Weber; Michael Figl; Helmar Bergmann; Markus Stock; Dietmar Georg; Wolfgang Birkfellner (Bildverarbeitung für die Medizin, 2012)

Automatic patient alignment for prostate radiation applying 3D ultrasound. - Marcus Kaar; Alfred Kratochwil; Michael Figl; Rainer Hoffmann 001; Amon Bhatia; Amar Bhatia; Wolfgang Birkfellner; Johann Hummel (Image-Guided Procedures, 2012)

Automatic analysis of ciliary beat frequency using optical flow. - Michael Figl; Manuel Lechner; Tobias Werther; Fritz Horak; Johann Hummel; Wolfgang Birkfellner (Image Processing, 2012)

Real-time 2D/3D registration for tumor motion tracking during radiotherapy. - Hugo Furtado; Christelle Gendrin; Christoph Bloch; Jakob Spoerk; Supriyanto A. Pawiro; Christoph Weber; Michael Figl; Markus Stock; Dietmar Georg; Helmar Bergmann; Wolfgang Birkfellner (Image Processing, 2012)

Electromagnetic tracking for US-guided interventions: standardized assessment of a new compact field generator. - Alfred M. Franz; Keno März; Johann Hummel; Wolfgang Birkfellner; Rolf Bendl; Stefan Delorme; Heinz-Peter Schlemmer; Hans-Peter Meinzer; Lena Maier-Hein (Int. J. Comput. Assist. Radiol. Surg., 2012)

Combining image-derived and venous input functions enables quantification of serotonin-1A receptors with [carbonyl-11C]WAY-100635 independent of arterial sampling. - Andreas Hahn 001; Lukas Nics; Pia Baldinger; Johanna Ungersböck; Peter Dolliner; Richard Frey; Wolfgang Birkfellner; Markus Mitterhauser; Wolfgang Wadsak; Georgios Karanikas; Siegfried Kasper; Rupert Lanzenberger (NeuroImage, 2012)

Image guidance system for flexible endoscopes considering tissue deformation. - Rainer Hoffmann 001; Michael Figl; Amar Bhatia; Marcus Kaar; Wolfgang Birkfellner; Andreas Püspök; Alfred Kratochwil; Johann B. Hummel (Image-Guided Procedures, 2013)

Evaluation of three 3D US calibration methods. - Johann Hummel; Marcus Kaar; Rainer Hoffmann 001; Amon Bhatia; Wolfgang Birkfellner; Michael Figl (Image-Guided Procedures, 2013)

Kabelloses elektromagnetisches Tracking in der Medizin. - Alfred M. Franz; D. Schmitt; Alexander Seitel; M. Chatrasingh; Gernot Echner; Hans-Peter Meinzer; Simeon Nill; Wolfgang Birkfellner; Lena Maier-Hein (Bildverarbeitung für die Medizin, 2014)

SPECT-US image fusion and clinical applications. - Johann Hummel; Marcus Kaar; Rainer Hoffmann 001; Wolfgang Birkfellner; Thomas Beyer; Anton Staudenherz; Michael Figl (Image-Guided Procedures, 2014)

Real-time intensity based 2D/3D registration using kV-MV image pairs for tumor motion tracking in image guided radiotherapy. - Hugo Furtado; Elisabeth Steiner; Markus Stock; Dietmar Georg; Wolfgang Birkfellner (Image Processing, 2014)

Electromagnetic Tracking in Medicine - A Review of Technology, Validation, and Applications. - Alfred M. Franz; Tamás Haidegger; Wolfgang Birkfellner; Kevin Cleary; Terry M. Peters; Lena Maier-Hein (IEEE Trans. Medical Imaging, 2014)

Automated SOSORT-recommended angles measurement in patients with adolescent idiopathic scoliosis. - Sasa Cukovic; Vanja Lukovic; Karupppasamy Subburaj; Wolfgang Birkfellner; Danijela Milosevic; Branko Ristic 002; Goran Devedzic (BIBE, 2015)

FIRE: an open-software suite for real-time 2D/3D image registration for image guided radiotherapy research. - Hugo Furtado; Christelle Gendrin; Jakob Spoerk; Elisabeth Steiner; Tracy S. A. Underwood; Thomas Kuenzler; Dietmar Georg; Wolfgang Birkfellner (Image Processing, 2016)

Deformable image registration with a featurelet algorithm: implementation as a 3D-slicer extension and validation. - Andreas Renner; Hugo Furtado; Yvette Seppenwoolde; Wolfgang Birkfellner; Dietmar Georg (Image Processing, 2016)

Visualization of Deformable Image Registration Quality Using Local Image Dissimilarity. - Matthias Schlachter; Tobias Fechter; Miro Jurisic; Tanja Schimek-Jasch; Oliver Oehlke; Sonja Adebahr; Wolfgang Birkfellner; Ursula Nestle; Katja Bühler (IEEE Trans. Medical Imaging, 2016)

Ultrasound guidance system for prostate biopsy. - Johann Hummel; Reinhard Kerschner; Marcus Kaar; Wolfgang Birkfellner; Michael Figl (Image-Guided Procedures, 2017)

Correlation of Vertebral Absolute Axial Rotations in CAD 3D Models of Adolescent Idiopathic Scoliosis Non-Invasively Diagnosed. - Sasa Cukovic; Vanja Lukovic; William R. Taylor; Wolfgang Birkfellner; Radu Emanuil Petruse; Nenad Filipovic (BIBE, 2019)

Design, Implementation, and Evaluation of a Head and Neck MRI RF Array Integrated with a 511 keV Transmission Source for Attenuation Correction in PET/MR. - Lucia I. Navarro de Lara; Roberta Frass-Kriegl; Andreas Renner; Jürgen Sieg; Michael Pichler; Thomas Bogner; Ewald Moser; Thomas Beyer; Wolfgang Birkfellner; Michael Figl; Elmar Laistler (Sensors, 2019)

Short Scan Source-detector Trajectories for Target-based CBCT. - Sepideh Hatamikia; Ander Biguri; Gernot Kronreif; Tom Russ; Joachim Kettenbach; Wolfgang Birkfellner (EMBC, 2020)

Possibility assessment of CBCT metal artifact reduction based on PICCS reconstruction and trajectory optimization. - Sepideh Hatamikia; Ander Biguri; Gernot Kronreif; Joachim Kettenbach; Tom Russ; Wolfgang Birkfellner (Image-Guided Procedures, 2022)