Table 2. Mean $\pm$ standard deviation of image quality metrics of ten experimental phantom DAS and SLSC images, compared the image quality metrics of the in vivo result shown in Fig. 9.

Experimental phantom DAS, multiple target sizes
	6 mm	8 mm	10 mm
gCNR	0.96 ± 0.01	0.83 ± 0.02	0.92 ± 0.01
Contrast (dB)	21.60 ± 0.30	19.11 ± 0.17	19.40 ± 0.24
CNR	1.34 ± 0.03	0.90 ± 0.02	1.43 ± 0.04
SNR	25.28 ± 1.56	13.62 ± 0.68	19.26 ± 0.93
Experimental phantom SLSC, 6 mm target, multiple $M$ values
	M = 5	M = 10	M = 20
gCNR	1 ± 0.001	0.98 ± 0.01	0.97 ± 0.01
Contrast (dB)	115.28 ± 0.14	110.39 ± 0.20	104.53 ± 0.23
CNR	3.60 ± 0.12	2.33 ± 0.09	1.65 ± 0.05
SNR	$1.93\times {10}^{19}\pm 1.27\times {10}^{19}$	$1.52\times {10}^{19}\pm 1.06\times {10}^{19}$	$5.18\times {10}^{18}\pm 5.45\times {10}^{18}$
In vivo SLSC, multiple $M$ values
	M = 1	M = 5	M = 10
gCNR	0.99	0.69	0.52
Contrast (dB)	83.54	35.29	31.42
CNR	3.47	1.19	0.81
SNR	19.26	4.83	3.13