Table 4.

ESD and ESC estimates derived from experimental data corresponding to the 41 μm glass bead phantom, ka and G_p were calculated using the transducer nominal center frequency, with ka corresponding to a scatterer diameter of 41 μm.

Transducer	ka	Gp	ESD (μm)				ESC (scatt./mm3)
η1	η2	${\eta }_3^G$	η3	η1	η2	${\eta }_3^G$	η3
2.25 MHz, f∕2.7	0.19	6.6	49.1 ± 19.1	15.6 ± 19.8	21.2 ± 22.81	15.4 ± 19.6	(2.4 ± 10.7) × l08	(1.3 ± 1.5) × l09	(7.2 ± 12.2) × l08	(1.3 ± 1.5) × l09
5 MHz, f∕3	0.43	16.8	54.8 ± 3.6	50.7 ± 4.0	53.8 ± 3.7	50.8 ± 4.0	16.7 ± 5.7	19.3 ± 8.1	16.7 ± 6.1	19.3 ± 8.2
7.5 MHz, f∕4	0.64	19.2	42.6 ± 1.4	40.4 ± 1.5	42.1 ± 1.5	40.4 ± 1.5	52.4 ± 7.7	51.3 ± 8.8	50.1 ± 7.6	51.3 ± 8.8
10 MHz, f∕4	0.86	15.7	41.6 ± 0.8	40.8 ± 0.8	41.4 ± 0.8	40.8 ± 0.8	48.5 ± 3.6	39.0 ± 3.0	44.5 ± 3.3	39.0 ± 3.0
10 MHz, f∕2	0.86	65.9	44.9 ± 1.0	44.4 ± 1.0	44.9 ± 1.1	44.4 ± 1.0	36.2 ± 3.9	32.5 ± 3.6	33.3 ± 3.6	32.6 ± 3.6
13 MHz, f∕3	1.12	29.4	41.7 ± 0.9	41.4 ± 1.3	41.7 ± 1.0	41.4 ± 1.3	61.9 ± 5.7	51.2 ± 5.4	56.8 ± 5.3	51.2 ± 5.4
15 MHz, f∕2	1.29	49.8	41.4 ± 0.6	41.4 ± 0.6	41.4 ± 0.6	41.4 ± 0.6	66.9 ± 6.0	56.4 ± 5.1	61.4 ± 5.5	56.4 ± 5.1
20 MHz, f∕4	1.71	16.2	39.2 ± 0.9	39.6 ± 0.9	39.3 ± 0.9	39.6 ± 0.9	79.4 ± 8.1	57.5 ± 5.9	70.9 ± 7.2	57.5 ± 5.9
20 MHz, f∕3	1.71	20.0	38.0 ± 1.0	38.3 ± 1.0	38.0 ± 1.0	38.3 ± 1.0	76.1 ± 9.8	58.8 ± 7.7	69.1 ± 8.8	58.9 ± 7.7