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Measured Center Frequencies, Bandwidths, and Resolutions of the Representative Transducers Used in This Study.
| Designed center frequency (MHz) | 35 | 90 | 120 | 150 |
| Measured center frequency (MHz) | 33.6 | 91.2 | 120.0 | 149.7 |
| −6-dB fractional bandwidth (%) | 47.7 | 42.0 | 24.1 | 28.1 |
| Axial resolution (μm) | 46.0 | 21.5 | 25.7 | 17.2 |
| Lateral resolution (μm) | 231.5 | 123.5 | 105.3 | 87.3 |
