TABLE I.

Contrast-to-noise (CNR) and contrast-to-artifact (CTA) ratios for in vitro imaging.

	PI (11.4 MHz)	AM (11.4 MHz)	AM (18 MHz)
hGVs vs. PS (N = 5)
CNR	9.0 dB	8.7 dB	15.6 dB
Std	0.6 dB	0.8 dB	0.6 dB
CTA	6.5 dB	7.8 dB	14.1 dB
Std	0.5 dB	0.7 dB	0.7 dB
hGVs vs. wtGVs (N = 5)
CNR	8.7 dB	7.9 dB	15.1 dB
Std	1.0 dB	0.5 dB	0.7 dB
CTA	6.4 dB	6.7 dB	11.7 dB
Std	0.7 dB	0.4 dB	0.2 dB