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QUANTITATIVE ANALYSIS OF TECHNIQUES FOR ACCURATE ESTIMATION OF ULTRASONIC ECHO-SIGNAL TIME-SHIFTS FROM BIOMEDICAL PHANTOMS

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Figure

Figure 1. Experimental pulse-echo interrogation set up
Figure 3. Temporal displacements obtained with QD technique. A) 4 echoes simulated signal, B) 7 echoes simulated signal, C) 4 echoes experimental signal (mini-spheres phantom) D) 7 echoes experimental signal (nylon threads phantom)
Table 1. Average errors for simulated signals with four echoes Window SC PDf PDs QD
Figure 6. Echo time-shifts obtained with the 4 estimation methods  for the simulated signal with seven echoes

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