TE values... could you please tell me which imagej plugin or other software
> Greetings Gonzalo,
>
> If you tell me what you are conceptually trying to accomplish, I could
> better guide you.
>
> Technically, all MR images are T2* weighted, as R2* (1/T2*) is the
> observed rate at which the MR signal attenuates due to the spins
> dephasing. Using a spin-echo sequence, the spins dephased by deltaB0 are
> rephased during image acquisition window and thus eliminates the T2'
> information from the image; thus making spin-echo the acquisition method
> of choice for T2 mapping. If using a gradient echo sequence is a
> requirement, then I assume that you can acquire enough images with
> properly spaced TE(s) such that you can do a bi-exponential fit to extract
> both T2 and T2'. Although note, that deltaB0 causes blurring/displacement
> in addition to signal attenuation.
>
> Enjoy,
>
> Fred
>
> On Mon, February 3, 2020 2:53 pm, Gonzalo Rojas Costa wrote:
> > Hi Fred:
> >
> > For T2* mapping I mean T2 mapping for gradient echo sequence...
> >
> > Sincerely,
> >
> >
> > Gonzalo Rojas Costa
> >
> >
> > El lun., 3 de febrero de 2020 21:06, Fred Damen <
[hidden email]>
> > escribió:
> >
> >> Greetings,
> >>
> >> It depends on what exactly what you mean by T2* mapping?
> >>
> >> If you are referring to determining the time constant then the same post
> >> processing plugin will work. 1/T2* = 1/T2 + 1/T2'; A spin echo pulse
> >> sequence eliminates, i.e, reduces to negligible level, the T2' component
> >> leaving just the T2 component. A gradient echo sequence includes the
> >> T2'
> >> component.
> >>
> >> If you are referring to creating deltaB0 map, then you need to do a
> >> linear
> >> fit to the phase image, albeit with special handling of the phase wrap.
> >> I
> >> have a plugin for this. (I have not yet dressed the code up for release
> >> though)
> >>
> >> If you are referring to Susceptibility Weighted Imaging, I do not know
> >> of
> >> a ImageJ plugin, albeit there are other tools out there.
> >>
> >> Enjoy,
> >>
> >> Fred
> >>
> >> On Mon, February 3, 2020 12:44 pm, Gonzalo Rojas Costa wrote:
> >> > Hi:
> >> >
> >> > Which plugin computes T2* mapping ?.. Because "MRI Analysis
> >> Calculator
> >> > v1.0" only computes T2 mapping...
> >> >
> >> > Sincerely,
> >> >
> >> >
> >> > Gonzalo Rojas Costa
> >> > Chair LABMAN (OHBM)
> >> >
> >> > Laboratory for Advanced Medical Image Processing
> >> > Department of Radiology
> >> > Health Innovation Center
> >> > Clínica las Condes
> >> > Lo Fontecilla 441, Las Condes, Santiago, Chile.
> >> > Tel: 56-2-2105170
> >> > Cel: 56-9-97771785
> >> >
http://www.aribrain.info> >> >
https://scholar.google.com/citations?user=LO7LZ3oAAAAJ> >> >
https://www.researchgate.net/profile/Gonzalo_Rojas2> >> >
http://www.researcherid.com/rid/B-2036-2013> >> >
https://cl.linkedin.com/in/gonzalorojascosta> >> >
> >> > --
> >> > ImageJ mailing list:
http://imagej.nih.gov/ij/list.html> >> >
> >>
> >> --
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http://imagej.nih.gov/ij/list.html> >>
> >
> > --
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>
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