The effect of retrobulbar tissues on the ultrasonic field.
D000273:Adipose Tissue; D000818:Animals; D009801:Oculomotor Muscles; D009900:Optic Nerve; D009915:Orbit; D012590:Sclera; D013016:Sound; D013552:Swine; D014465:Ultrasonics; D000159:Vestibulocochlear Nerve