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. Author manuscript; available in PMC: 2025 Oct 10.
Published in final edited form as: IEEE Trans Ultrason Ferroelectr Freq Control. 2024 Oct 10;71(10):1244–1254. doi: 10.1109/TUFFC.2024.3440832

Table I.

MEAN AND STANDARD DEVIATION (S.D.) OF ESTIMATED SOUND SPEED IN THE HOMOGENEOUS SPECKLE SIMULATION. VALUES WERE COMPUTED AROUND THE SIX POINTS HIGHLIGHTED IN FIG. 3 USING 5-MM-BY-5-MM KERNELS. UNITS ARE IN M/S.

x = −1 cm
 z = 4 cm		  x = 0 cm z = 4 cm  x = 1cm z = 4 cm x = −1 cm
 z = 5 cm		  x = 0 cm z = 5 cm  x = 1 cm z = 5 cm
 Direct Mean
 S.d.		  1542.2
 5.4		  1542.1
 4.8		  1540.6
 5.9		  1544.1
 10.1		  1540.2
 7.4		  1542.2
 10.1
 1D Mean
 S.d.		  1542.2
 3.0		  1542.1
 1.9		  1540.9
 3.9		  1542.1
 5.4		  1540.9
 2.6		  1542.1
 5.4
 2D Mean
 S.d.		  1541.9
 2.0		  1542.1
 1.8		  1541.2
 2.9		  1541.8
 2.9		  1541.0
 2.4		  1541.7
 2.6