| http://www.w3.org/ns/prov#value | - d and received to and from a living body, wherein the configuration is such that the acoustic lens is a concave lens formed from a material that has less propagation loss than a silicone resin and that has a greater acoustic velocity than a living body, and a relationship between acoustic velocity c1 of the concave lens, acoustic velocity c2 of the liquid, and acoustic velocity c3 of the living bo
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