prewind#

mrinufft.trajectories.tools.prewind(trajectory: ndarray[tuple[int, ...], dtype[_ScalarType_co]], Ns_transitions: int) → ndarray[tuple[int, ...], dtype[_ScalarType_co]][source]#

Add pre-winding/positioning to the trajectory.

The trajectory is extended to start before the readout from the k-space center with null gradients and reach each shot position with the required gradient strength.

Parameters:

  • trajectory (NDArray) – Trajectory to extend with rewind gradients.

  • Ns_transitions (int) – Number of pre-winding/positioning steps used to leave the k-space center and prepare for each shot to start.

Returns:

Extended trajectory with pre-winding/positioning.

Return type:

NDArray

Example using prewind:#

Trajectory tools

Trajectory tools