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. Author manuscript; available in PMC: 2013 Jun 6.
Published in final edited form as: IEEE Trans Ultrason Ferroelectr Freq Control. 2012 Oct;59(10):2210–2225. doi: 10.1109/TUFFC.2012.2447

TABLE III.

−20-dB Effective Width W, Radius R, and Peripheral Energy Ratio (PER) of Transmit Focuses for Apertures Partitioned With Different Element Pitches.

Pitch (mm) WElev (mm) WArray (mm) Reff (mm) PER
Elevation pitch
 Unc (0.6 × 0.6) 6.3 6.3 3.2 1.98
 Ideal (0.6 × 0.6) 1.7 1.6 0.8 0.11
 Comp (0.6 × 0.6) 1.7 1.6 0.8 0.13
 Comp (1.8 × 0.6) 1.7 1.6 0.8 0.14
 Comp (3.0 × 0.6) 1.7 1.6 0.8 0.17
 Comp (4.2 × 0.6) 1.7 1.6 0.8 0.19
 Comp (5.4 × 0.6) 1.6 1.6 0.8 0.38
Square pitch
 Unc (0.6 × 0.6) 6.3 6.3 3.2 1.98
 Ideal (0.6 × 0.6) 1.7 1.6 0.8 0.11
 Comp (0.6 × 0.6) 1.7 1.6 0.8 0.13
 Comp (1.8 × 1.8) 1.7 1.7 0.9 0.15
 Comp (3.0 × 3.0) 2.2 1.7 1.0 0.23
 Comp (4.2 × 4.2) 2 2 1.7 1.0 0.24
 Comp (5.4 × 5.4) 2.1 2.8 1.2 0.58

Unc = uncompensated; Comp = compensated.