Fig 3. Gradient delay calibration using k-phase: Shown are 45 spokes of the measured calibration data from the x-y plane to illustrate the concept.

The magnitude is shown in (a), the phase in (b) and an enlarged central part of (b) is shown in (c). The colors characterize the spoke index using a continuous jet color map where blue is the first and red the last index. The dashed black line marks the expected position of the k-space center.