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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

Table I.

Evaluation metrics for VA beamforming with different ultrasound frequencies

Frequency, MHz Rx, mm Ry, mm Rz, mm PR MNI SPR GLMx, dB GLMy, dB
5 0.81 1.31 10.27 0.66 1.00 0.66 −24.56 −26.57
6 0.71 1.15 9.26 0.56 0.73 0.41 −20.23 −20.82
7 0.63 1.05 8.76 0.47 0.50 0.24 −16.69 −16.70
8 0.59 1.01 8.91 0.38 0.33 0.13 −13.67 −13.52

Rx, Ry, Rz: - 6 dB resolution in x-, y-, and z-directions; PR: Power Ratio, MNI: Maximum Normalized Intensity; SPR: Scaled Power Ratio; GLMx, GLMy: Grating Lobe Magnitude in x-, and y-directions.