PT  - JOURNAL ARTICLE
AU  - P Rojanapongpun
AU  - B Morrison
AU  - S M Drance
TI  - Reproducibility of transcranial Doppler ultrasound examinations of the ophthalmic artery flow velocity.
AID  - 10.1136/bjo.77.1.22
DP  - 1993 Jan 01
TA  - British Journal of Ophthalmology
PG  - 22--24
VI  - 77
IP  - 1
4099  - http://bjo.bmj.com/content/77/1/22.short
4100  - http://bjo.bmj.com/content/77/1/22.full
SO  - Br J Ophthalmol1993 Jan 01; 77
AB  - Transcranial Doppler ultrasound measurements of ophthalmic artery velocity were made on 88 patients predominantly suffering from glaucoma. Of the four observed parameters, peak velocity, mean-enveloped velocity, diastolic velocity, and resistivity index, the latter was found to be the most reproducible (CV = 5.2%). The variability between patients was approximately twice that of the variability between consecutive measurements. Measurement error appeared to decrease as the operator gained experience.