sigpy.mri.rf.adiabatic.hypsec¶
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sigpy.mri.rf.adiabatic.
hypsec
(n=512, beta=800, mu=4.9, dur=0.012)[source]¶ Design a hyperbolic secant adiabatic pulse.
mu * beta becomes the amplitude of the frequency sweep
Parameters: - n (int) – number of samples (should be a multiple of 4).
- beta (float) – AM waveform parameter.
- mu (float) – a constant, determines amplitude of frequency sweep.
- dur (float) – pulse time (s).
Returns: 2-element tuple containing
- a (array): AM waveform.
- om (array): FM waveform (radians/s).
References
Baum, J., Tycko, R. and Pines, A. (1985). ‘Broadband and adiabatic inversion of a two-level system by phase-modulated pulses’. Phys. Rev. A., 32:3435-3447.