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)

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)

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)

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)

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)

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)

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)

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)

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)

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)

An error analysis perspective for patient alignment systems. - Michael Figl; Marcus Kaar; Rainer Hoffmann 001; Alfred Kratochwil; Johann Hummel (Int. J. Comput. Assist. Radiol. Surg., 2013)

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)

New conversion factors between human and automatic readouts of the CDMAM phantom for CR systems. - Johann Hummel; Peter Homolka; Angelika Osanna-Elliot; Marcus Kaar; Friedrich Semtrus; Michael Figl (Image Perception, Observer Performance, and Technology Assessment, 2016)

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

Error analysis for a navigation system using 3D abdominal ultrasound. - David Iommi; Alejandra Valladares; Michael Figl; Johann Hummel (Image-Guided Procedures, 2020)