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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 II.

Evaluation metrics for VA beamforming with different configurations at different focal depths (zf) at 5 MHz

zf,
mm		 Configuration Rx,
mm		 Ry,
mm		 Rz,
mm		 PR MNI SPR GLMx,
dB		 GLMy,
dB		 Active
Elements
15 1 0.46 0.46 7.75 0.15 0.47 0.07 −5.53 −5.53 128
2 0.53 0.53 9.15 0.31 0.71 0.22 −14.04 −14.04 100
3 1.01 0.59 5.43 0.41 0.81 0.34 −14.35 −18.21 120
4 0.59 1.01 5.43 0.41 0.81 0.34 −18.21 −14.35 120
5 0.40 0.47 6.63 0.12 0.25 0.03 −1.40 −0.45 128
6 0.56 0.59 5.43 0.14 0.81 0.11 −8.05 −8.05 120
20 1 0.56 0.56 12.45 0.36 0.93 0.33 −15.80 −15.80 128
2 0.66 0.66 13.68 0.51 0.84 0.43 −21.22 −21.22 100
3 1.13 0.69 7.40 0.56 1.00 0.56 −20.24 −22.02 120
4 0.69 1.13 7.40 0.56 1.00 0.56 −22.02 −20.24 120
5 0.49 0.54 10.35 0.28 0.68 0.19 −12.44 −12.53 128
6 0.62 0.69 7.40 0.23 1.00 0.23 −11.59 −11.59 120
25 1 0.69 0.69 17.10 0.50 0.98 0.49 −21.41 −21.41 128
2 0.81 0.81 18.18 0.62 0.74 0.46 −25.86 −25.86 100
3 1.34 0.82 10.30 0.66 0.95 0.62 −24.57 −25.25 120
4 0.82 1.34 10.30 0.66 0.95 0.62 −25.25 −24.57 120
5 0.60 0.64 14.45 0.41 0.80 0.33 −18.20 −18.61 128
6 0.71 0.82 10.30 0.31 0.95 0.29 −13.48 −13.48 120
30 1 0.81 0.81 21.68 0.58 0.88 0.51 −25.37 −25.37 128
2 0.95 0.95 22.60 0.69 0.62 0.43 −29.23 −29.23 100
3 1.57 0.96 13.73 0.72 0.82 0.59 −27.97 −28.02 120
4 0.96 1.57 13.73 0.72 0.82 0.59 −28.02 −27.97 120
5 0.72 0.75 18.80 0.49 0.77 0.37 −22.24 −22.74 128
6 0.82 0.96 13.73 0.37 0.82 0.30 −14.56 −14.56 120
35 1 0.94 0.94 25.83 0.64 0.75 0.48 −28.42 −28.42 128
2 1.11 1.11 26.53 0.72 0.50 0.36 −31.86 −31.86 100
3 1.81 1.11 17.53 0.75 0.68 0.51 −30.71 −27.76 120
4 1.11 1.81 17.53 0.75 0.68 0.51 −27.76 −30.71 120
5 0.83 0.86 23.30 0.54 0.68 0.37 −25.42 −23.34 128
6 0.94 1.11 17.53 0.41 0.68 0.28 −15.11 −15.11 120