Figure 2. Magnitude (A), time-domain (B) and phase (C) of measured gradient IRF for the three axes, without pre-emphasis compensation. The arrows highlight channel specific known mechanical resonances at lower frequencies. No filtering has been used on this data. Notably, measurement noise in the IRF increases towards the higher frequencies, where the power of the input waveform is null.

Figure 4. Representative images for two different readouts for a 2D spiral acquisition. For the shorter readout (A) both monitored and IRF demonstrate distinct sharpening of the grid lines and decreased blurring at the edges, compared to nominal reconstruction, also evident in the difference images (B). For the longer readout (C), error in correction for the field monitored measurement is a result of the probes dephasing during the long readout (D). IRF predicted trajectory correction can be used to compensate for this.