Animal diseases in archaeology - download pdf or read online

By John Robin Baker

ISBN-10: 0120741504

ISBN-13: 9780120741502

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10). By the same token, lower frequency sound waves have longer wavelengths so pulse duration and length are increased. Accurate ultrasound images can only be generated if all reflected and scattered echoes are received at the transducer before the next pulse is generated. The transducer assumes that the echoes it receives are products of its last burst. If an echo has not been received before the next burst and it arrives at the transducer shortly after the second burst, then the instrument “thinks” very little time has elapsed since it was transmitted and received.

16). Beam width varies along the length of the sound wave but is at its narrowest at the focal zone in focused transducers. Lateral resolution is best (smallest) at the focal zone. 16). 16). 16 The ability to resolve two structures as different in a plane perpendicular (lateral resolution) to the sound beam depends upon beam width. ( A) Two structures that fall within beam width will not be differentiated ( B) while two structures that are farther apart than the beam width will be identified as separate.

This loss of energy is called attenuation. High frequency sound attenuates to a greater degree than lower frequency sound because its wavelength allows it to interact with more structures. This is the reason the deep bass sounds of an orchestra carry farther than the high-pitched sounds. The large degree of attenuation with high frequency sound leaves less energy available for continued transmission through the medium. ↑ Frequency = ↓ Depth ↓ Frequency = ↑ Depth The half-power distance of a tissue is the distance sound will travel through it before half of the available sound energy has been attenuated.

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Animal diseases in archaeology by John Robin Baker

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