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)

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)

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)

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)