title: Reliability of panoramic ultrasound imaging to simultaneously examine muscle size and quality of the medial gastrocnemius.
abstract: BACKGROUND
  In this study we examined the test-retest reliability of panoramic brightness-mode ultrasound (US) imaging to simultaneously measure both muscle size and quality from a single US image.
  
  
  METHODS
  Sixteen healthy, recreationally active men (age = 20.9 ± 2.5 years) volunteered for this investigation. Test-retest reliability was evaluated using intraclass correlation coefficients (ICCs) and the standard error of measurement as a percentage of the mean (SEM%). Muscle size [cross-sectional area (CSA)], and muscle quality [echo intensity (EI)] of the medial gastrocnemius were examined on 2 separate days.
  
  
  RESULTS
  These measures demonstrated acceptable reliability between assessment days with ICCs and SEM% of 0.914 and 0.720 and 5.830 and 3.680 for CSA and EI, respectively.
  
  
  CONCLUSIONS
  These results suggest that panoramic US imaging may be a reliable technique for simultaneous assessment of both muscle size and quality from a single US scan.
authors.affiliation: Neuromuscular Research Laboratory, Department of Exercise and Sport Science, 209 Fetzer Hall, CB 8700, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, 27599-8700, USA.
authors.forename: Joseph G
authors.initials: JG
authors.lastname: Rosenberg
authors.forename: Eric D
authors.initials: ED
authors.lastname: Ryan
authors.forename: Eric J
authors.initials: EJ
authors.lastname: Sobolewski
authors.forename: Michael J
authors.initials: MJ
authors.lastname: Scharville
authors.forename: Brennan J
authors.initials: BJ
authors.lastname: Thompson
authors.forename: Gilbert E
authors.initials: GE
authors.lastname: King
mesh_terms: D000293:Adolescent; D064368:Healthy Volunteers; D006801:Humans; D007866:Leg / Q000033:anatomy & histology / Q000000981:diagnostic imaging*; D008297:Male; D018482:Muscle, Skeletal / Q000033:anatomy & histology / Q000000981:diagnostic imaging*; D009929:Organ Size; D015203:Reproducibility of Results; D014463:Ultrasonography / Q000379:methods; D055815:Young Adult
keywords: cross-sectional area; echo intensity; extended field-of-view; imaging; medial gastrocnemius