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. Author manuscript; available in PMC: 2014 Mar 1.
Published in final edited form as: IEEE Trans Ultrason Ferroelectr Freq Control. 2013 Mar;60(3):535–551. doi: 10.1109/TUFFC.2013.2595

Figure 1.

Figure 1

(a) Block diagram of vibro-acoustography performed with a 1.75D array transducer. The intersection of the two ultrasound beams is electronically swept in the azimuthal direction of the transducer and then mechanically scanned in the elevation direction of the transducer. The electronic focal depth can be changed to image different planes. The interaction of the two ultrasound beams in the tissue produces an acoustic signal at the difference frequency, Δf, between the two ultrasound beams. This acoustic emission is detected by a nearby hydrophone and the signal is filtered, amplified, digitized, and processed for image formation and display. (b) Photograph of 1.75D array transducer with white plastic casing.