System and method for acoustic imaging at two focal lengths with a single lens
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United States of America Patent
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Sep 9, 2003
Grant Date -
Apr 24, 2003
app pub date -
Oct 20, 2001
filing date -
Oct 20, 2001
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Abstract
An acoustic lens having two or more regions, each region having a different acoustic index of refraction. The lens may have a simple, non-compound, surface in which both regions form different sections of the same convex or concave curve with the same functional dependence. The transition between the two regions may be gradual or abrupt. The attenuation and other characteristics of the lens may be tailored to provide apodisation and to filter out unwanted frequencies.
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