convert_trajectory_to_gradients#
- mrinufft.trajectories.utils.convert_trajectory_to_gradients(trajectory, norm_factor=0.5, resolution=0.0006, raster_time=0.01, gamma=Gammas.HYDROGEN, get_final_positions=False)[source]#
Derive a normalized trajectory over time to provide gradients.
- Parameters:
trajectory (np.ndarray) – Normalized trajectory consisting of k-space coordinates in 2D or 3D.
norm_factor (float, optional) – Trajectory normalization factor, by default KMAX.
resolution (float, np.array, optional) – Resolution of MR image in meters, isotropic as int or anisotropic as np.array. The default is DEFAULT_RESOLUTION.
raster_time (float, optional) – Amount of time between the acquisition of two consecutive samples in ms. The default is DEFAULT_RASTER_TIME.
gamma (float, optional) – Gyromagnetic ratio of the selected nucleus in kHz/T The default is Gammas.HYDROGEN.
get_final_positions (bool, optional) – If True, return the final positions in k-space. The default is False.
- Returns:
gradients – Gradients corresponding to trajectory.
- Return type:
np.ndarray