Clinical Evaluation of Endorientation:Gravity related rectification for endoscopic images

Kurt Höller, Jochen Penne, Joachim Hornegger, Armin Schneider, Sonja Gillen, Hubertus Feußner, Jasper Jahn, Javier Gutierrez, Thomas Wittenberg

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

8 Scopus citations

Abstract

Providing a stable horizon on endoscopic images especially in non-rigid endoscopic surgery (particularly NOTES) is still an open issue. Image rectification can be realized with a tiny MEMS tri-axial inertial sensor that is placed on the tip of an endoscope. By measuring the impact of gravity on each of the three orthogonal axes the rotation angle can be estimated with some calculations out of these three acceleration values. Achievable repetition rate for angle termination has to be above the usual endoscopic video frame rate of 25-30Hz. The accelerometer frame rate can be set up to 400 Hz. Accuracy has to be less than one degree even within periods of high movement and superposed acceleration. Therefore an intelligent downsampling algorithm has to be found. The image rotation is performed by rotating digitally a capture of the endoscopic analog video signal. Improvements and benefits have been evaluated in a clinical evaluation: For different peritoneoscopic tasks time was taken and instrument position was tracked and recorded.

Original languageEnglish
Title of host publicationISPA 2009 - Proceedings of the 6th International Symposium on Image and Signal Processing and Analysis
PublisherIEEE Computer Society
Pages713-717
Number of pages5
ISBN (Print)9789531841351
DOIs
StatePublished - 2009
Externally publishedYes
Event6th International Symposium on Image and Signal Processing and Analysis, ISPA 2009 - Salzburg, Austria
Duration: 16 Sep 200918 Sep 2009

Publication series

NameISPA 2009 - Proceedings of the 6th International Symposium on Image and Signal Processing and Analysis

Conference

Conference6th International Symposium on Image and Signal Processing and Analysis, ISPA 2009
Country/TerritoryAustria
CitySalzburg
Period16/09/0918/09/09

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