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THE EFFECT OF CITRATE AND COAGULATED BLOOD ON ULTRASONIC INTENSITY
Author(s) -
OKSALA ARVO
Publication year - 1975
Publication title -
acta ophthalmologica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.534
H-Index - 87
eISSN - 1755-3768
pISSN - 1755-375X
DOI - 10.1111/j.1755-3768.1975.tb01138.x
Subject(s) - sclera , ultrasonic sensor , refraction , intensity (physics) , sound (geography) , ultrasound , sound intensity , anatomy , materials science , chemistry , optics , ophthalmology , medicine , acoustics , physics
Pig eyes were used in the examination. The rear wall calotte formed by the sclera was filled alternately with citrate and coagulated blood. The effect of these on sound intensity was investigated by measuring relative sound intensities in six acoustic cross sections 1 mm from one another. The eye shell, i. e. the sclera had a strong effect on the echo amplitudes in the three outermost acoustic cross sections. In the three cross sections obtained from the centre of the calotte it was observed that coagulated blood attenuated ultrasound 10–15 dB more than citrate blood. In the centre of the calotte, attenuation was caused by coagulated blood but the effect of reflection and refraction in the sclera increased towards the edges. As far as clinical research is concerned, it can be concluded that when a large blood coagulation fills the vitreous the tissues behind it have to be examined with a greater sound energy than when the examination is performed through a clear vitreous or one filled with exudate.