make_rf_spoiling_schedule

make_rf_spoiling_schedule#

pypulseqpp.make_rf_spoiling_schedule()[source]#

Return quadratic RF-spoiling phases in radians.

Apply each phase to both excitation and ADC offsets. With the default initial increment, the first two phases are equal.

Parameters:

  • length (int) – Number of repetitions.

  • increment (float, default=np.deg2rad(117.0)) – Quadratic phase increment (rad); 117 degrees by default.

  • initial_phase (float, default=0.0) – Phase of the first repetition (rad).

  • initial_increment (float, default=0.0) – Linear increment at the first repetition (rad).

Returns:

Phases (rad) in [0, 2 pi), length length.

Return type:

numpy.ndarray

Raises:

ValueError – If length is negative.

Examples

>>> import numpy as np
>>> import pypulseqpp as pp
>>> np.rad2deg(pp.make_rf_spoiling_schedule(4)).round(1)
array([  0.,   0., 117., 351.])

See also

make_phase_cycling_schedule

the balanced-SSFP alternative.