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Characteristics of transducers used in the phantom measurements.
| Transducer | Nominal center frequency diameter | Measured peak frequency (MHz) | 12-dB bandwidth (MHz) | Measured focal length (mm) |
|---|---|---|---|---|
| 1 | 2.25 MHz/19 mm | 2.2 | 1.7 | 99 |
| 2 | 3.5 MHz/13 mm | 4.0 | 4.0 | 73 |
| 3 | 5.0 MHz/13 mm | 4.6 | 3.7 | 90 |
| 4 | 7.5 MHz/9 mm | 7.8 | 4.0 | 36 |
