Surgical Endoscopy

, Volume 27, Issue 3, pp 1029–1039

EVA: Laparoscopic Instrument Tracking Based on Endoscopic Video Analysis for Psychomotor Skills Assessment

  • Ignacio Oropesa
  • Patricia Sánchez-González
  • Magdalena K. Chmarra
  • Pablo Lamata
  • Álvaro Fernández
  • Juan A. Sánchez-Margallo
  • Frank Willem Jansen
  • Jenny Dankelman
  • Francisco M. Sánchez-Margallo
  • Enrique J. Gómez
New Technology



The EVA (Endoscopic Video Analysis) tracking system is a new system for extracting motions of laparoscopic instruments based on nonobtrusive video tracking. The feasibility of using EVA in laparoscopic settings has been tested in a box trainer setup.


EVA makes use of an algorithm that employs information of the laparoscopic instrument’s shaft edges in the image, the instrument’s insertion point, and the camera’s optical center to track the three-dimensional position of the instrument tip. A validation study of EVA comprised a comparison of the measurements achieved with EVA and the TrEndo tracking system. To this end, 42 participants (16 novices, 22 residents, and 4 experts) were asked to perform a peg transfer task in a box trainer. Ten motion-based metrics were used to assess their performance.


Construct validation of the EVA has been obtained for seven motion-based metrics. Concurrent validation revealed that there is a strong correlation between the results obtained by EVA and the TrEndo for metrics, such as path length (ρ = 0.97), average speed (ρ = 0.94), or economy of volume (ρ = 0.85), proving the viability of EVA.


EVA has been successfully validated in a box trainer setup, showing the potential of endoscopic video analysis to assess laparoscopic psychomotor skills. The results encourage further implementation of video tracking in training setups and image-guided surgery.


Minimally invasive surgery EVA TrEndo Training Motion analysis Video 


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Copyright information

© Springer Science+Business Media, LLC 2012

Authors and Affiliations

  • Ignacio Oropesa
    • 1
    • 2
  • Patricia Sánchez-González
    • 1
    • 2
  • Magdalena K. Chmarra
    • 3
    • 6
  • Pablo Lamata
    • 1
  • Álvaro Fernández
    • 1
    • 2
  • Juan A. Sánchez-Margallo
    • 5
  • Frank Willem Jansen
    • 3
    • 4
  • Jenny Dankelman
    • 3
  • Francisco M. Sánchez-Margallo
    • 5
  • Enrique J. Gómez
    • 1
    • 2
  1. 1.Bioengineering and Telemedicine Centre (GBT), ETSI TelecomunicaciónUniversidad Politécnica de Madrid (UPM)MadridSpain
  2. 2.Networking Research Center on Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN)SaragossaSpain
  3. 3.Department of BioMechanical Engineering, Faculty of Mechanical, Maritime and Materials Engineering (3mE)Delft University of TechnologyDelftThe Netherlands
  4. 4.Department of GynecologyLeiden University Medical CenterLeidenThe Netherlands
  5. 5.Jesús Usón Minimally Invasive Surgery CentreCáceresSpain
  6. 6.Department of Circulation and Medical Imaging, Faculty of MedicineNorwegian University of Science and Technology (NTNU)TrondheimNorway

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