Jan Kretschmer, Department of Computer Graphics, FAU Erlangen, and Siemens Healthcare Computed Tomography, Forchheim, Germany Grzegorz Soza, Siemens Healthcare Computed Tomography, Forchheim, Germany Christian Tietjen, Siemens Healthcare Computed Tomography, Forchheim, Germany Michael Suehling, Siemens Healthcare Computed Tomography, Forchheim, Germany Bernhard Preim, Department of Simulation and Graphics, Otto-von-Guericke University of Magdeburg, Germany Marc Stamminger, Department of Computer Graphics, FAU Erlangen, Germany