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Coronal view speed of sound images of cylindrical phantoms shown in Fig. 4. The four phantoms have cylindrical rods of diameter (a) 20 mm, (b) 10 mm, (c) 5 mm, and (d) 1.4 mm. The rods can be clearly seen as bright (higher speed of sound) circular regions within a darker (lower speed of sound) background medium. The numbers next to dashed lines correspond to “Measurement #” column in Table 3.
