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. Author manuscript; available in PMC: 2012 Jul 24.
Published in final edited form as: IEEE Trans Ultrason Ferroelectr Freq Control. 2011 Jul;58(7):1344–1354. doi: 10.1109/TUFFC.2011.1954

Fig. 10.

Fig. 10

Effect of transducer frequency. The focal Fraunhofer (FF) method is more effective for the combinations of ROI sigma values and focal depths represented by the region under each line. The decision plot shifts in favor of the FF method for lower transducer center frequencies.