Journée H L, van Bruggen A C, van der Meer J J, de Jonge A B, Mooij J J
Neurosurgery Department, University Clinic, Groningen, Netherlands.
Med Biol Eng Comput. 1995 Mar;33(2):140-4. doi: 10.1007/BF02523031.
The recording of sounds over the orbit of the eye has been found to be useful in the detection of intracranial aneurysms. A hydrophone for auscultation over the eye has been developed and is tested under controlled conditions. The tests consist of measurement over the eyes in three healthy volunteers at rest, during voluntary breathing, during eyeball movements and during sustained orbicular muscular contractions. Furthermore, measurements are performed at the side of the nose. Major features of the hydrophonic transducer are high sensitivity to physiological sounds and a high degree of insensitivity to environmental sounds propagated through the air. It can be concluded that the hydrophone may be useful for the early detection of intracranial aneurysms and also for apnoea detection.
