Table 1.

Ultrasound System Settings for Imaging Near and Far Zone Vessels in a Grayscale Small Parts Phantom.

System Identification Code	Transducer & Transmission Frequency (MHz)	Dynamic Range (dB) or Compression	Most Linear Grayscale Map(*)	MI (Near & Far)	Mean Optimum Gain Value per Vessel Near (Range), Far (Range)
A	L14-5/38	145	6	<0.80	66.8(58–77), 71.2(58–84)
Ultrasonix SonicTOUCH (BK Ultrasound, Peabody, MA, USA)	H 10.0			<0.75
B	9L4	90	A	0.90	0.0(0-0), 0.0(0-0)
Acuson S2000 (Siemens Medical Solutions, Malvern, PA, USA)	H 9.0			0.80
C	L10-5	70	L	0.50	8.8(8–10), 15.2(12–18)
Siemens CV 70 (Siemens Medical Solutions, Malvern, PA, USA)	10.0			0.50
D	8L5	100	4	0.80	8.0(4–14), 8.6(5–13)
Acuson Sequoia (Siemens Medical Solutions, Malvern, PA, USA)	8.0			0.59
E	L9-3	70	5	0.70	47.6(45–50), 48.6(46–50)
Philips iE33 (Philips Healthcare, Andover, MA, USA)	Gen			0.90
F	9L4	90	A	1.3	0.0(0-0), 0.0(0-0)
Acuson S2000 (Siemens Medical Solutions, Malvern, PA, USA)	H 8.0			1.1
G	9L	102	C	1.2	3.2(2–4), 3.2(2–4)
GE VIVID E9 (GE Healthcare, Waukesha, WI, USA)	4.0/8.0			1.2

MI = mechanical index

H = harmonic

^*System G clinical carotid grayscale map.