idosyzs.m

A simplified model of the Zangger-Sterk pure shift iDOSY pulse sequence for studies of the diffusional attenuation during soft pulses as described in https://doi.org/10.1016/j.jmr.2019.02.010.

Syntax

inten=idosyzs(spin_system,parameters,H,R,K,G,F)

Arguments

parameters.rho0 - initial state

  parameters.coil           - detection state
  
  parameters.spins          - nuclei on which the sequence runs

  parameters.g_amp          - gradient amplitude for diffusion encoding, T/m

  parameters.sel_g_amp      - gradient amplitude during the selective pulse, T/m
 
  parameters.rf_phi         - phase of the inversion pulse, rad/s  
                                        
  parameters.delta_big      - length of the diffusion delay, s

  parameters.delta_sml      - pulse width of the gradient for diffusion
                               encoding, s   
 
  parameters.rf_dur         - length of the selective 180 degree pulse, s

  parameters.filename       - a character string specifying the pulse shape, e.g gaussian_1000.pk
 
  parameters.pulse_npoints  - number of points in the soft pulse

  parameters.diff           - diffusion constant, m^2/s
  
  The last five parameters (H,R,K,G,F) are built automatically by imaging.m context function 
  when this sequence is called from that context.

Outputs

inten - the absolute value of the first point in

            the free induction decay; this number is
            proportional to the integral of the real
            part of the correctly phased spectrum

mariagrazia.concilio@sjtu.edu.cn
gareth.morris@manchester.ac.uk

Examples

An example is available in Spinach in: examples/nmr_spen/idosyzs_test_1.m.

See also

imaging.m, chirp_pulse.m, shaped_pulse_xy.m, step.m, evolution.m, coherence.m dosy_oneshot.m, spendosy.m, spendosycosy.m

Shaped pulses and gradients

Version 2.4, authors: Maria Grazia Concilio, Gareth Morris