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Beam profiles: (a) lateral and (b) acoustical axis for transducer with 1.689 MHz central frequency (fc), external diameter (Dext) of 100 mm, internal diameter (Dint) of 70 mm and geometrical focus (Rc) of 80 mm; (c) lateral and (d) acoustical axis for transducer with 1.536 MHz central frequency (fc), external diameter (Dext) of 100 mm, internal diameter (Dint) of 14 mm and geometrical focus (Rc) of 80 mm.
