TABLE V.

Contrast Ratio (dB) of B-Scan Images Along Elevation/Array Directions Using Apertures With Different Element Pitches.

Pitch (mm)	Uncomp	Rx	Tx	Tx + Rx	Ideal
Elevation pitch
0.6 × 0.6	−7.4/−5.4	−16.7/−13.9	−15.7/−14.1	−22.0/−20.3	−23.4/−21.8
1.8 × 0.6	−7.4/−5.4	−15.6/−13.2	−15.3/−13.1	−21.6/−18.3	−23.4/−21.8
3.0 × 0.6	−7.4/−5.4	−14.6/−11.6	−14.5/−12.2	−21.5/−16.8	−23.4/−21.8
4.2 × 0.6	−7.4/−5.4	−15.5/−13.1	−15.0/−12.3	−21.7/−16.5	−23.4/−21.8
5.4 × 0.6	−7.4/−5.4	−12.2/−10.6	−12.8/−11.1	−18.9/−15.4	−23.4/−21.8
Square pitch
0.6 × 0.6	−7.4/−5.4	−16.7/−13.9	−15.7/−14.1	−22.0/−20.3	−23.4/−21.8
1.8 × 1.8	−7.4/−5.4	−15.0/−12.6	−14.2/−12.3	−21.4/−18.0	−23.4/−21.8
3.0 × 3.0	−7.4/−5.4	−16.3/−13.3	−14.1/−13.1	−22.6/−17.0	−23.4/−21.8
4.2 × 4.2	−7.4/−5.4	−13.0/−13.5	−13.4/−11.1	−20.2/−16.1	−23.4/−21.8
5.4 × 5.4	−7.4/−5.4	−13.4/−13.3	−13.1/−9.8	−16.0/−12.7	−23.4/−21.8

Uncomp = uncompensated; Rx = receive compensation; Tx = transmit compensation; Tx + Rx = full compensation.