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Ultrasound characteristics of the three transducers used in this study.
| Transducer Center Frequency (MHz) | –3 dB Beam Width (mm) | Focus/Rayleigh Distance (mm) | Depth of Field (mm) | Aperture (mm) | Type |
|---|---|---|---|---|---|
| 0.12 | 24.0 | 92.2 | 76 | 61.4 | Unfocused |
| 1.03 | 6.0 | 81.3 | 60 | 25.4 | Unfocused |
| 2.00 | 2.5 | 35.1 | 46 | 14.0 | focused |
