Transmission of Ultrasound Through the Temporal Bone
The problem of the acoustic properties of the skull were studied by White and co-workers (1967, 1978). The skull consists of three layers of bone influencing the ultrasound in different manners. The middle layer (diploe), has the most important effect on the attenuation and scattering of the ultrasound, especially when the bony spicules have a diameter comparable to the wave length. However, these spicules are absent in the temporal region where the skull is at its thinnest. The outer and inner table of ivory bone are important for refraction. The inner table follows the windings of the brain. This curvature will act as a lens and refraction can also be induced by these variations of thickness.
KeywordsSound Pressure Acoustic Power Main Lobe Ultrasonic Beam Transducer Surface
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