sigpy.mri.rf.sim.abrm_ptx¶
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sigpy.mri.rf.sim.
abrm_ptx
(b1, x, g, dt, fmap=None, sens=None)[source]¶ N-dim RF pulse simulation
Assumes that x has inverse spatial units of g, and g has gamma*dt applied.
Assumes dimensions rf = [Nc, Nt], x = […,Ndim], g = [Ndim,Nt], and sens = [Nc, dim, dim].
Parameters: - b1 (array) – rf waveform input samples in radians.
- x (array) – spatial locations (m).
- g (array) – gradient array (mT/m with gamma*dt applied).
- dt (float) – hardware dwell time (s).
- fmap (array) – off-resonance map (Hz).
- sens (array or None) – B1+ sensitivity matrix. If None, creates matrix of 1’s. Input size [Nc dim dim]
Returns: 4-element tuple containing
- a (array): SLR alpha parameter.
- b (array): SLR beta parameter.
- m (array): transverse magnetization.
- mz (array): longitudinal magnetization.
References
Pauly, J., Le Roux, Patrick., Nishimura, D., and Macovski, A.(1991). ‘Parameter Relations for the Shinnar-LeRoux Selective Excitation Pulse Design Algorithm’. IEEE Transactions on Medical Imaging, Vol 10, No 1, 53-65.
Grissom, W., Xu, D., Kerr, A., Fessler, J. and Noll, D. (2009). ‘Fast large-tip-angle multidimensional and parallel RF pulse design in MRI’ IEEE Trans Med Imaging, Vol 28, No 10, 1548-59.