Difference between revisions of "Grad pulse.m"
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Revision as of 13:00, 7 September 2015
Computes the effect of a gradient pulse on the sample average density matrix using Edwards formalism. It is assumed that the effect of diffusion is negligible, that the gradient is linear, and that it is antisymmetric about the middle of the sample. Syntax:
rho=grad_pulse(spin_system,rho,g_amp,s_len,g_dur,s_fac)
Arguments:
rho  spin system state vector
L  system Liouvillian
g_amp  gradient amplitude, Gauss/cm
s_len  sample length, cm
g_dur  gradient pulse duration, seconds
s_fac  gradient shape factor, use 1 for square gradient pulses
Note: the function integrates over sample coordinates  subsequent gradient pulses would not refocus the magnetization that it has defocused. To simulate a gradient sandwich, use grad_sandw.m function. More information on the subject is available in Luke's paper (http://dx.doi.org/10.1016/j.jmr.2014.01.011).