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Pressure field radiated by one of the PCD’s used in the experiments. The receive field is proportional to the transmit field. [(a) and (b)] Simulated field at 610 kHz; [(c) and (d)] simulated field at 110 kHz (half the frequency of the FUS device). The focal point is shown in the plots (+). [(a) and (c): sagittal view; (b) and (d): coronal view.] Norm.: Normalized.
