title: Determining scope position during colonoscopy without use of ionizing radiation or magnetic imaging: the enhanced mapping ability of the NeoGuide Endoscopy System.
abstract: BACKGROUND
  Knowledge of the position and shape of the endoscope could overcome many challenges of performing colonoscopy, e.g., loop formation. A novel computer-assisted colonoscope (NeoGuide Endoscopy System) delivers a real-time, three-dimensional map of the tip position and insertion tube shape in addition to the video image of the colon lumen. The aim of this study is to evaluate the mapping capabilities of the NeoGuide Endoscopy System in terms of colonic looping, insertion depth, tip position, and tip angle formation.
  
  
  METHODS
  Ten endoscopists with various levels of experience were each shown 70 map images generated by the NeoGuide endoscopy system in a benchtop anatomical colon model. First endoscopists were asked to determine the tip angle based on the map image and the system's corresponding tip positioning aid (20 images). In the second part they had to identify the scope-tip position in the colon model (40 images). In the third part ten images were presented for identification of colonic loops.
  
  
  RESULTS
  The tip angle was correctly identified in 99% (198/200) of images. Using only the map images the scope position was accurately determined in 87.5% (350/400). Identification of colonic looping of the scope was appropriate in 99% (99/100). Overall accuracy was 92.4%, and overall positive predictive value was 94.9%.
  
  
  CONCLUSIONS
  Three-dimensional map images generated by the NeoGuide endoscopy system provide accurate information regarding tip position, insertion tube position, and colonic looping.
authors: Medical Department C, Klinikum Ludwigshafen gGmbH, Bremserstrasse 79, 67063, Ludwigshafen, Germany. j.striegel@web.de
authors: Johannes
authors: J
authors: Striegel
authors: Ralf
authors: R
authors: Jakobs
authors: Jacques
authors: J
authors: Van Dam
authors: Uwe
authors: U
authors: Weickert
authors: Jürgen F
authors: JF
authors: Riemann
authors: Axel
authors: A
authors: Eickhoff
mesh_terms: D002983:Clinical Competence; D020685:Colonoscopes; D003113:Colonoscopy / Q000193:education / Q000379:methods*; D003198:Computer Simulation; D003936:Diagnosis, Computer-Assisted / Q000295:instrumentation / Q000379:methods*; D004867:Equipment Design; D005260:Female; D006801:Humans; D021621:Imaging, Three-Dimensional; D008279:Magnetic Resonance Imaging; D008297:Male; D008953:Models, Anatomic; D011839:Radiation, Ionizing; D012680:Sensitivity and Specificity