[Accuracy of measurement of subretinal fluid volume using B-scan ultrasonography]

Using a videoultrasonography and image computerized system, it was possible to measure the volume of subretinal fluid in eye models. The ultrasound probe was rotated 180 degrees upon eye models with retinal detachment and the scan images were recorded by a video cassette recorder. Each subretinal space in successive ultrasound image slices was calculated by image analyzer. There were 8 types of models which varied according to the volume or the shape of retinal detachment. As a probe rotating time 3 seconds, 5 seconds, and 8 seconds were employed for each eye model. The measurement error between the actual and the measured volume was -0.08 +/- 1.88% (mean +/- standard deviation, n = 48). The probe rotating time did not influence the measurement error. The results showed that the measurement system for subretinal fluid volume appears to be of clinical value.