Table 2.

Imaging parameters for stability and sensitivity evaluation of the depth of penetration (DOP) measurement. Baseline parameters list the starting point scan parameters. Stability and sensitivity parameters match the baseline parameters except for the indicated changes. The second sensitivity test used the baseline scan parameters but with the 0.5 dB/cm/MHz gel region of the CIRS phantom

Depth of penetration test	11L	C1‐5	S1‐5
Baseline
Transmit frequency	11 MHz	5 MHz	4 MHz
Power	100%	100%	100%
Gain	80 dB	85 dB	75 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	75/90, 80/84, 80/96, 85/90	80/90, 85/84, 85/96, 90/90	70/90, 75/84, 75/96, 80/90
Changed gray map	A and J	A and J	A and J
Sensitivity
Changed power	50% and 20%	50% and 20%	50% and 20%
Changed phantom background	0.5 dB/cm/MHz gel	0.5 dB/cm/MHz gel	0.5 dB/cm/MHz gel