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Targets Configuration Anechoic Cysts
Diameters . . . . . 2, 4 and 6 mm
Placement . . . . . 3, 8 and 14 cm deep
Speed of sound . . 1540 ±10 m/s at 22°C
Attenuation . . . . 0.5 or 0.7 ±0.05 dB/cm/MHz
Grey Scale Targets
Dimensions . . . . . 9.5x9.5x10.9 mm
Placement . . . . . 4 cm deep
Speed of sound . . 1540 ±10 m/s at 22°C
Attenuation coefficient . . . . . same as background
Contrast. . . . . . . low scatter, -6dB, +6dB; high scatter relative to background
Pin Targets
Diameter . . . . . . 0.1 mm (0.004 in)
Vertical spacing. . 20 mm at 2-16 cm deep
Horizontal spacing . . . . . . . 30 mm at 2 and 12 cm deep
Construction Scanning surface . . . . . . . Composite Film
Walls . . . . . . . . . Extruded ABS
Dimensions . . . . . 23.2x8.25x18.5 cm (9.25x3.25x7.25 in)
Weight. . . . . . . . 2.8 kg (6 lbs 5 oz)
All acoustic measurements at 4.5 MHz, 22°C |