Chair for Computer Aided Medical Procedures & Augmented Reality
Lehrstuhl für Informatikanwendungen in der Medizin & Augmented Reality

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Title: Advanced 3D visualization for intra operative AR
Abstract: Dorsal surgery, e.g. herniated intervertebral discs, is a medical domain that can benefit from new techniques for visualization of medical data. Vertebras are covered by the spine, big muscles, rips, blood vessels and other viscera. Reaching the operation site while an intervention is a difficult and sometimes hazardous undertaking and a direct view onto the vertebras is nearly impossible. If possible, nowadays interventions concerning the spinal column are performed via keyhole surgery. Because there is just a small hole through the skin, the surgeon has to navigate his instruments according to the images created by the camera of the endoscope and screened on a monitor. Effects of computer graphic, techniques of visualization, a video see-through head mounted display (HMD) and an optical tracking system enable the stereoscopic in-situ representation of CT data. Data is aligned with the required accuracy and the surgeons get an intuitive view onto and ”‘into”’ the patient. Unfortunately, this method of representing medical data suffers from a serious lack. Virtual imagery, such as a volume rendered spinal column, can only be displayed superimposed on real objects. If virtual entities of the scene are expected behind real ones, like the spinal column inside the human thorax, this lack implicates incorrect perception of the viewed objects respective their distance to the observer. The powerful visual depth clue interposition is responsible for this misinformation about depth. This thesis aims at the development and evaluation of methods that improve depth perception in stereoscopic AR. Its intention is to provide an extended view onto the human body that allows an intuitive localization of visualized bones and viscera such as vertebras, muscles, rips and blood vessels. Therefore various approaches were implemented and designed to create or intensify helpful depth clues within the workspace of a surgeon.
Student: Christoph Bichlmeier
Director: Nassir Navab
Supervisor: Tobias Sielhorst
Type: Diploma Thesis
Status: finished
Start: 2005/06/15
Finish: 2006/02/28

Edit | Attach | Refresh | Diffs | More | Revision r1.10 - 17 Jul 2008 - 08:53 - ChristophBichlmeier