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fUS is a sensitive technique in monitoring the hemodynamics response of the spinal cord even during subthreshold SCS intensities (i.e. silent EMG). (a) Temporal spinal cord blood volume change (ΔSCBV) color coded on the Power Doppler (PD) images at several point times. A movie is available in the Supplemental video 1. (b) and (c) are ΔSCBV curve and ΔEMG signal for a test with sub-threshold SCS and silent EMG. (d) ΔSCBV peak response vs ΔEMG for the 8 tests with silent EMG signals.
