title: Use of color doppler imaging for determining the resistive index of the medial long posterior ciliary artery in clinically normal conscious dogs.
abstract: OBJECTIVE
  To evaluate the use of color Doppler imaging (CDI) for determining the resistive index (RI) of the medial long posterior ciliary artery (mLPCA) in clinically normal conscious dogs.
  
  
  METHODS
  18 (10 sexually intact males, 8 sexually intact females) dogs between 1 and 5 years old.
  
  
  METHODS
  Color Doppler ultrasonography was performed on both eyes with dogs in a sitting position. Each eye was imaged from the region dorsal to the zygomatic arch with the transducer positioned in a horizontal plane. The mLPCA was localized, and RI was calculated from velocities obtained for 3 similar Doppler waveforms. To determine the reproducibility of CDI-derived RI, measurements were repeated twice at a 10-day interval.
  
  
  RESULTS
  Mean (+/- SD) RI of the mLPCA was 0.68 +/- 0.07 (95% confidence interval, 0.65 to 0.70; n = 36 eyes). Resistive index did not significantly differ between right and left eyes or male and female dogs. In addition, body weight was not correlated with RI. Repeated measurements of RI did not yield significantly different results (interclass correlation coefficient, 0.8297).
  
  
  CONCLUSIONS
  Color Doppler imaging appears to be a valid technique for determination of RI of the mLPCA in conscious dogs. This technique may be useful for investigating the pathophysiologic processes of many ocular and orbital vascular disorders in dogs.
authors.affiliation: Department of Radiology, Veterinary Medical Teaching Hospital, College of Veterinary Medicine, Seoul National University, Korea.
authors.forename: Heechun
authors.initials: H
authors.lastname: Lee
authors.forename: Dongwoo
authors.initials: D
authors.lastname: Chang
authors.forename: Youngwon
authors.initials: Y
authors.lastname: Lee
authors.forename: Kidong
authors.initials: K
authors.lastname: Eom
authors.forename: Hojung
authors.initials: H
authors.lastname: Choi
authors.forename: Kangmoon
authors.initials: K
authors.lastname: Seo
authors.forename: Mincheol
authors.initials: M
authors.lastname: Choi
authors.forename: Junghee
authors.initials: J
authors.lastname: Yoon
mesh_terms: D000818:Animals; D001835:Body Weight; D019842:Ciliary Arteries / Q000000981:diagnostic imaging*; D004285:Dogs / Q000033:anatomy & histology*; D005260:Female; D007839:Functional Laterality; D008297:Male; D015203:Reproducibility of Results; D018615:Ultrasonography, Doppler, Color / Q000662:veterinary*; D014655:Vascular Resistance / Q000502:physiology*