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Comparison of DOF for different types of focusing at values of zf in phantoms P1 and P2. The plotted values are the mean and standard deviations from five measurements, (a) Comparison of hybrid and spherical focusing DOF results for N = 64, 96 and 128 elements in P1, (b) Comparison of hybrid and spherical focusing DOF results for N = 64, 96 and 128 elements in P2.
