Table 3.
Imaging parameters for stability and sensitivity evaluation of the spatial resolution measurements. Baseline parameters list the starting point scan parameters. Stability and sensitivity parameters match the baseline parameters except for the indicated changes
| Spatial resolution test | 9L | C1‐5 | S1‐5 |
|---|---|---|---|
| Baseline | |||
| Transmit frequency | 7 MHz | 4 MHz | 3 MHz |
| Power | 100% | 100% | 100% |
| Gain | 85 dB | 63 dB | 60 dB |
| Dynamic range | 90 dB | 90 dB | 90 dB |
| Gray map | D | D | D |
| Phantom background | 0.7 dB/cm/MHz gel | 0.7 dB/cm/MHz gel | 0.7 dB/cm/MHz gel |
| Stability | |||
| Changed gain/dynamic range | 80/90, 85/84, 85/96, 90/90 | 58/90, 63/84, 63/96, 68/90 | 55/90, 60/84, 60/96, 65/90 |
| Changed gray map | A and J | A and J | A and J |
| Sensitivity | |||
| Changed transmit frequency | 5 and 9 MHz | 2 and 5 MHz | 2 and 4 MHz |