Frequency Particle size 4 MHz 2 MHz 1000 µm 500 µm 200 µm 1000 µm 500 µm 200 µm MEB (dB) ± SD 20±3 19±3 17± 23±3 23±2 19±2 Duration (ms) 18±3 16±3 14±5 16±4 33±8 14±4

Table 2: MEBR and signal duration of the particles with 2 and 4 MHz probes with SD

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