Transcranial Doppler ultrasound measurement of the ophthalmic artery resistivity index is highly reproducible, with measurement error decreasing as operator experience increases.
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May aid standardization of ophthalmic Doppler protocols; leaves open clinical utility in vascular eye disease.
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.
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Rojanapongpun et al. (1993) studied this question.
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