psycosy.m

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Alan Kenwright's spatially encoded COSY sequence described in https://doi.org/10.1002/mrc.4727 (Figure 4).

Syntax

    fid=psycosy(spin_system,parameters,H,R,K,G,F)

Arguments

   parameters.sweep     sweep width in Hz

   parameters.npoints   number of points for both dimensions

   parameters.spins     nuclei on which the sequence runs,
                        specified as {'1H'}, {'13C'}, etc.

   parameters.tmix      mixing time, seconds

   parameters.gamp      gradient amplitude, T/m

   parameters.sal_ang   flip angle of the saltire chirp (degrees)

   parameters.sal_dur   pulse width of saltire chirp (s)

   parameters.sal_del   chirp pulse gradient duration (s)

   parameters.sal_swp   sweep width of saltire chirp (Hz)

   parameters.sal_npt   number of points in the saltire chirp

   parameters.sal_smf   saltire chirp smoothing factor

   H                    Fokker-Planck Hamiltonian, received
                        from the imaging context

   R                    Fokker-Planck relaxation superoperator,
                        received from the imaging context

   K                    Fokker-Planck kinetics superoperator,
                        received from the imaging context

   G                    Fokker-Planck gradient superoperators,
                        received from the imaging context

   F                    Fokker-Planck diffusion and flow super-
                        operator, received from the context

Outputs

   fid  - two-dimensional free induction decay

Examples

Several examples may be found in the examples/nmr_spen directory. The PSYCOSY spectrum of salsalate is reproduced below, note that one of the two dimensions is pure shift.

Psycosy.png

See also

psyche.m, spencosy.m, spendosy.m, st_ideal.m


Version 2.4, authors: Alan Kenwright