[Mristudio-users] radial diffusivity, mean diffusivity

[susumu mori]

Andreas is right.
So called ADC (average diffusion constant, apparent diffusion constant) and
MD (mean diffusivity) are obtained by trace/3 (trace divided by 3), while
the trace is (eigenvalue0+eigenvalue1+eigenvalue2).

also, axial diffusivity is same as eigenvalue0 and radial diffusivity is the
average of eigenvalue1 and 2 [ (eigenvalue1+eigenvalue2)/2].

On Wed, Feb 23, 2011 at 8:31 AM, Andreas Buchmann <buchmann2 at wisc.edu>wrote:

> Dear Yo,
>
> I'm using trace diffusivity, which is strongly related to mean diffusivity
> (I think, just multiplied with a constant factor, experts correct me if I'm
> wrong).
>
> Andreas
>
>
>
> -----Original Message-----
> From: mristudio-users-bounces at mristudio.org
> [mailto:mristudio-users-bounces at mristudio.org] On Behalf Of
> 107310 at ib.k.u-tokyo.ac.jp
> Sent: Dienstag, 22. Februar 2011 19:36
> To: DTI Studio, ROI Editor, DiffeoMap Questions/Support
> Subject: Re: [Mristudio-users] radial diffusivity, mean diffusivity
>
> Dear Andreas, Ryuzo and DTI experts
>
>
> I also try to calculate mean diffusivity.
> But in DTI studio, only the radial diffusivity and ADCs can calculate at
> the 'Image'-tab with ROI.
>
> Is there any function to measure mean diffusivity?
> Please give me any suggestion.
>
> Many thanks.
>
>
> YO
>
>
> > Dear Andreas
> >
> >
> >
> > Thank you very much for your suggestion.  I will try.
> >
> >
> >
> > Ryuzo
> >
> >
> >
> > From: mristudio-users-bounces at mristudio.org
> > [mailto:mristudio-users-bounces at mristudio.org] On Behalf Of Andreas
> Buchmann
> > Sent: Monday, February 21, 2011 11:03 PM
> > To: 'DTI Studio, ROI Editor, DiffeoMap Questions/Support'
> > Subject: Re: [Mristudio-users] radial diffusivity, mean diffusivity
> >
> >
> >
> > Dear Ryuzo,
> >
> >
> >
> > yes, you're on the right track with (1). After the estimation, DTI-
> Studio
> > appends the images to the list of images you have, and you can see
> them
> > under the 'Image'-tab and save them with right-click on the image.
> >
> >
> >
> > Good luck
> >
> > Andreas
> >
> >
> >
> >   _____
> >
> > From: mristudio-users-bounces at mristudio.org
> > [mailto:mristudio-users-bounces at mristudio.org] On Behalf Of hanaie
> > Sent: Montag, 21. Februar 2011 07:46
> > To: mristudio-users at mristudio.org
> > Subject: [Mristudio-users] radial diffusivity, mean diffusivity
> >
> >
> >
> > Dear DTI experts
> >
> >
> >
> > How can I do to obtain the radial diffusivity and mean diffusivity in
> DTI
> > studio?
> >
> >
> >
> > 1.     In the " Dti Map" tab, clicking "Tensor, color Map etc" button,
> and
> > checking the checkboxes "Radial", "Trace"
> >
> >
> >
> > 2.     After tensor calculation and fiber tracking, if I click "
> statistics"
> > button in the "Fiber" tab and
> >
> >  I choose the each image and click "go" button in the another window,
> can I
> > obtain radial and mean diffusivity?
> >
> >
> >
> >
> >
> > Please give me any suggestion.
> >
> >
> >
> > Many thanks.
> >
> >
> >
> > Ryuzo
> >
> >
> >
> >
> > _______________________________________________
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> >
>
>
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