3D position estimation of flexible instruments: marker-less and marker-based methods

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    14 Citations (Scopus)

    Abstract

    Purpose Endoscopic images can be used to allow accurate flexible endoscopic instrument control. This can be implemented using a pose estimation algorithm, which estimates the actual instrument pose from the endoscopic images. Methods In this paper, two pose estimation algorithms are compared: a marker-less and a marker-based method. The marker-based method uses the positions of three markers in the endoscopic image to update the state of a kinematic model of the endoscopic instrument. The marker-less method works similarly, but uses the positions of three feature points instead of the positions of markers. The algorithms are evaluated inside a colon model. The endoscopic instrument is manually operated, while an X-ray imager is used to obtain a ground-truth reference position. Results The marker-less method achieves an RMS error of 1.5, 1.6, and 1.8 mm in the horizontal, vertical, and away-from-camera directions, respectively. The marker-based method achieves an RMS error of 1.1, 1.7, and 1.5 mm in the horizontal, vertical, and away-from-camera directions, respectively. The differences between the two methods are not found to be statistically significant. Conclusions The proposed algorithms are suitable to realize accurate robotic control of flexible endoscopic instruments, enabling the physician to perform advanced procedures in an intuitive way.
    Original languageUndefined
    Pages (from-to)407-417
    Number of pages11
    JournalInternational journal of computer assisted radiology and surgery
    Volume8
    Issue number3
    DOIs
    Publication statusPublished - 3 Jul 2013

    Keywords

    • EWI-24594
    • IR-89832
    • METIS-304030

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