title: Accuracy of the NDI wave speech research system.
abstract: OBJECTIVE
  This work provides a quantitative assessment of the positional tracking accuracy of the NDI Wave Speech Research System.
  
  
  METHODS
  Three experiments were completed: (a) static rigid-body tracking across different locations in the electromagnetic field volume, (b) dynamic rigid-body tracking across different locations within the electromagnetic field volume, and (c) human jaw-movement tracking during speech. Rigid-body experiments were completed for 4 different instrumentation settings, permuting 2 electromagnetic field volume sizes with and without automated reference sensor processing.
  
  
  RESULTS
  Within the anthropometrically pertinent "near field" (< 200 mm) of the NDI Wave field generator, at the 300-mm(3) volume setting, 88% of dynamic positional errors were < 0.5 mm and 98% were < 1.0 mm. Extreme tracking errors (> 2 mm) occurred within the near field for < 1% of position samples. For human jaw-movement tracking, 95% of position samples had < 0.5 mm errors for 9 out of 10 subjects.
  
  
  CONCLUSIONS
  Static tracking accuracy is modestly superior to dynamic tracking accuracy. Dynamic tracking accuracy is best for the 300-mm(3) field setting in the 200-mm near field. The use of automated head correction has no deleterious effect on tracking. Tracking errors for jaw movements during speech are typically < 0.5 mm.
authors.affiliation: Marquette University, Milwaukee, WI, USA. jeffrey.berry@marquette.edu
authors.forename: Jeffrey J
authors.initials: JJ
authors.lastname: Berry
mesh_terms: D000886:Anthropometry / Q000295:instrumentation*; D001696:Biomechanical Phenomena; D004574:Electromagnetic Fields; D006801:Humans; D021621:Imaging, Three-Dimensional; D007568:Jaw; D009068:Movement; D012016:Reference Values; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013062:Speech Articulation Tests / Q000295:instrumentation*; D013068:Speech Production Measurement / Q000295:instrumentation*