Abstract
Abstract: :
Purpose: Identify the anterior and posterior boundaries of the choroid in–vivo in order to quantify choroidal thickness variation in such diseases or states as myopia, hypotony, endophthalmitis and tumors. Methods: Subjects were scanned with a 20 MHz ultrasound digital scanner with individual scans taken throughout the cardiac cycle. Using power spectrum analytical techniques, the posterior boundary of the choroid can be distinguished from the sclera in the region of the lamina fusca. Sequential OCT measurements were used to aid in quantifying choroidal thickness when media were optically clear. Results: The choroidal thickness and its variation in time can be quantified far more accurately than with conventional B–scan techniques. Clinical utility in evaluating small melanomas versus nevi and endophthalmitis versus hemorrhagic change were documented. Conclusions: The use of digital evaluation of rf ultrasound data were useful in augmenting clinical observation and routine B–scan data.
Keywords: imaging methods (CT, FA, ICG, MRI, OCT, RTA, SLO, ultrasound) • choroid • retina