The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences
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Articles | Volume XLIII-B2-2022
Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XLIII-B2-2022, 679–686, 2022
https://doi.org/10.5194/isprs-archives-XLIII-B2-2022-679-2022
Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XLIII-B2-2022, 679–686, 2022
https://doi.org/10.5194/isprs-archives-XLIII-B2-2022-679-2022
 
30 May 2022
30 May 2022

GUIDED CALIBRATION OF MEDICAL STEREO ENDOSCOPES

M. Hardner1, R. Docea2, and D. Schneider3 M. Hardner et al.
  • 1Professur für Photogrammetrie, Technische Universität Dresden, Germany
  • 2National Center for Tumor Deseases Dresden, Germany
  • 3University of Applied Sciences Dresden, Germany

Keywords: calibration, stereo, endoscope, augmented reality, guided calibration, user experience

Abstract. Using stereo endoscopes for 3D reconstruction in minimally invasive surgery, the calibration of the stereo system is required. Since calibration in general and of medical endoscopes in particular is a well discussed topic, this publication will focus on the user experience in the operating room. To enable the medical personnel in performing the calibration, a guided process using an augmented camera image has been developed and implemented on the basis of the Robot Operating System framework. A similarly guided accuracy check allows the user to determine beforehand if a calibration is necessary.

The method is tested by performing multiple calibrations on two different stereo endoscopes. It is shown, that the accuracy check and calibration can be completed in around 2 minutes. The resulting calibration parameters for one endoscope are analyzed in terms of temporal stability. Additionally, the self-heating that occurs after the system starts is examined. It is shown that short- and long-term effects impact the stereo system stability and that regular re-calibrations might be required for use in 3D reconstruction.