Rotor-Lab angle

[RebeccaS]

Hi Mikhail--

I would like to be able to simulate off-magic angle experiments. I
saw that you added a "beta_RL" variable for this (thanks!!!), but I am
having trouble figuring out how to use it. Could you please explain
how to implement this variable correctly?

Thank you for your help,
Rebecca

[Mikhail Veshtort]

Hi Rebecca,

You just set this variable to the value you have in the experiment.
Say, if your angle is 50 degrees, you should put
beta_RL=pi*50/180
in the variables section of the main input file.

Mikhail

[RebeccaS]

Thanks, Mikhail! I was trying to give the number of radians in
decimals instead.

[Antonio.N...@roma1.infn.it]

Hi,
I'd like to know if there would be the possibility to simulate with
spin-evolution spectra where you can keep into account the effect of the
localization. Thanks
Antonio

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[Mikhail Veshtort]

Hi Antonio,

I do not know what you mean by "localization effects". Could you
perhaps explain?

Mikhail

[Antonio.N...@roma1.infn.it]

hi,
Sorry for not being enough clear. I meant the effect that can come when you add
localization features to the spectroscopy acquisition like the in vivo
spectroscopy does. Recently a paper showed how the shape of the spectra can
depend on the localization gradients and the effect is larger when the field
strengh is higher.
thanks
Antonio

[Mikhail Veshtort]

Hi Antonio,

I still do not fully understand what you would like to simulate. The
program can simulate gradients. It can also do averaging over a
parameter if your sample is not homogeneous. Perhaps, that would be
sufficient for this problem, but I don't really know. There are no
special features for modeling localization effects (and I don't know
what would they have to do).

Mikhail

[Antonio.N...@roma1.infn.it]

Dear Mikhail,
Here is exactly what I would like to do concerning the localization effects.
'Numerical simulations of localized high field 1H MR spectroscopy Journal of
Magnetic Resonance 195 (2008) 67–75'.
I would be gratefull if you could have a look at it and advice me if there is
anything I can do to reproduce that with spinevolution.
Thanks

[Mikhail Veshtort]

Hi Antonio,

I had a look at the paper, and I have a feeling that one could do
these simulations with SPINEVOLUTION. However, since the paper is full
of MRI jargon, it is quite hard to understand for me in detail (and I
can't spend too much time figuring these things out), so I cannot
guarantee. To be more specific, I do not understand the pulse sequence
(RF+gradients+acquisition) very well. The only possible source of
problems I could see is that SPINEVOLUTION does not allow a 3D data
output (although this is not an insoluble issue).

Mikhail