[Mristudio-users] radial diffusivity, mean diffusivity

[107310 at ib.k.u-tokyo.ac.jp]

Dear all

Thanks for many helps.
I'll try to measure Trace.


Regards
YO


> 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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