sigpy.mri.rf.trajgrad.spiral_arch¶
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sigpy.mri.rf.trajgrad.
spiral_arch
(fov, res, gts, gslew, gamp)[source]¶ Analytic Archimedean spiral designer. Produces trajectory, gradients, and slew rate. Gradient returned has units mT/m.
Parameters: - fov (float) – imaging field of view in m.
- res (float) – resolution, in m.
- gts (float) – sample time in s.
- gslew (float) – max slew rate in mT/m/ms.
- gamp (float) – max gradient amplitude in mT/m.
Returns: (g, k, t, s) tuple containing
- g - (array): gradient waveform [mT/m]
- k - (array): exact k-space corresponding to gradient g.
- time - (array): sampled time
- s - (array): slew rate [mT/m/ms]
Return type: tuple
References
Glover, G. H.(1999). Simple Analytic Spiral K-Space Algorithm. Magnetic resonance in medicine, 42, 412-415.
Bernstein, M.A.; King, K.F.; amd Zhou, X.J. (2004). Handbook of MRI Pulse Sequences. Elsevier.