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  • In the preferred embodiment, lens 50 is an acoustic lens made of plastic, such as polystyrene or other suitable material with an acoustic refractive index relative to tissue different from 1. (Polystyrene, for example, has an index of refraction versus water of approximately 0.66.) As the refractive index is less than 1, a plastic lens needs to be concave, as opposed to a glass lens which must be
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