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In Case 1, Mode 1–3 provided USF images with similar SNRs; in both Case 2 and Case 3, USF images achieved the highest SNRs when the Mode 2 was adopted.
| Case 1 | Case 2 | Case 3 | ||||
|---|---|---|---|---|---|---|
| SNR | FWHM (mm) | SNR | FWHM (mm) | SNR | FWHM (mm) | |
| Mode 1 | 46.4 | 1.48 | 37.1 | 1.31 | 7.8 | 0.76 |
| Mode 2 | 47.3 | 1.46 | 53.7 | 1.25 | 34.1 | 1.11 |
| Mode 3 | 47.5 | 1.45 | 36.3 | 1.22 | 8.0 | 0.98 |
In all cases, FWHMs remained similar in the three modes.
