Re: [Freesurfer] Volume maps unit in FreeView

[Martin Juneja]

Thanks Dr. Greve. That makes sense if the color bar in FreeView represents
vertex-wise volume and area for ?h.volume and ?h.area respectively.

Actually, 20-40K mm^3 (i.e. 20-40 cm^3) volume range I extracted is for Yeo
networks, I guess thats why this range is much higher compared to
vertex-wise volume.

Thanks.

On Wed, Feb 15, 2017 at 3:42 PM, Douglas N Greve 
wrote:

> When you say volume maps, I assume you are talking about the ?h.volume
> file produced by FS. In that case (assuming you have not scaled the the
> eTIV), then that is "volume of a vertex" in mm3 (for surface area it is
> in mm2). Not sure what you mean about the actual volume values in the
> 20-40k range.
>
>
> On 02/14/2017 04:34 PM, Martin Juneja wrote:
> > Hi,
> >
> > I have a very simple question.
> >
> > I have cortical volume maps (averaged over 30 subjects). I can view
> > those in FreeView using lh.pial overlaid with lh.mean.volume.mgh file.
> > In overlay > configure option, I had to set the min as 0 and max as 4
> > to display the average volume. Now the color bar is showing scale
> > between 0 (min as blue color) and 4 (red) as maximum. I am not sure
> > what does this 0 and 4 represent here, what are its units and how the
> > actual volume values 20,000-40,000 mm^3 converted to this range
> > between 0 and 4?
> >
> > Similarly, for surface area, color bar range is between 0 and 0.9 when
> > actual values range around 11000-14000 and for cortical thickness,
> > color bar range is between 1 and 3 when actual values range around
> > 2.1-3 mm.
> >
> > Any help please.
> >
> > Thanks.
> >
> >
> > ___
> > Freesurfer mailing list
> > Freesurfer@nmr.mgh.harvard.edu
> > https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
>
> --
> Douglas N. Greve, Ph.D.
> MGH-NMR Center
> gr...@nmr.mgh.harvard.edu
> Phone Number: 617-724-2358
> Fax: 617-726-7422
>
> Bugs: surfer.nmr.mgh.harvard.edu/fswiki/BugReporting
> FileDrop: https://gate.nmr.mgh.harvard.edu/filedrop2
> www.nmr.mgh.harvard.edu/facility/filedrop/index.html
> Outgoing: ftp://surfer.nmr.mgh.harvard.edu/transfer/outgoing/flat/greve/
>
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>
>
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Re: [Freesurfer] Volume maps unit in FreeView

[Douglas N Greve]

When you say volume maps, I assume you are talking about the ?h.volume 
file produced by FS. In that case (assuming you have not scaled the the 
eTIV), then that is "volume of a vertex" in mm3 (for surface area it is 
in mm2). Not sure what you mean about the actual volume values in the 
20-40k range.


On 02/14/2017 04:34 PM, Martin Juneja wrote:
> Hi,
>
> I have a very simple question.
>
> I have cortical volume maps (averaged over 30 subjects). I can view 
> those in FreeView using lh.pial overlaid with lh.mean.volume.mgh file. 
> In overlay > configure option, I had to set the min as 0 and max as 4 
> to display the average volume. Now the color bar is showing scale 
> between 0 (min as blue color) and 4 (red) as maximum. I am not sure 
> what does this 0 and 4 represent here, what are its units and how the 
> actual volume values 20,000-40,000 mm^3 converted to this range 
> between 0 and 4?
>
> Similarly, for surface area, color bar range is between 0 and 0.9 when 
> actual values range around 11000-14000 and for cortical thickness, 
> color bar range is between 1 and 3 when actual values range around 
> 2.1-3 mm.
>
> Any help please.
>
> Thanks.
>
>
> ___
> Freesurfer mailing list
> Freesurfer@nmr.mgh.harvard.edu
> https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer

-- 
Douglas N. Greve, Ph.D.
MGH-NMR Center
gr...@nmr.mgh.harvard.edu
Phone Number: 617-724-2358
Fax: 617-726-7422

Bugs: surfer.nmr.mgh.harvard.edu/fswiki/BugReporting
FileDrop: https://gate.nmr.mgh.harvard.edu/filedrop2
www.nmr.mgh.harvard.edu/facility/filedrop/index.html
Outgoing: ftp://surfer.nmr.mgh.harvard.edu/transfer/outgoing/flat/greve/

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[Freesurfer] Volume maps unit in FreeView

[Martin Juneja]

Hi,

I have a very simple question.

I have cortical volume maps (averaged over 30 subjects). I can view those
in FreeView using lh.pial overlaid with lh.mean.volume.mgh file. In overlay
> configure option, I had to set the min as 0 and max as 4 to display the
average volume. Now the color bar is showing scale between 0 (min as blue
color) and 4 (red) as maximum. I am not sure what does this 0 and 4
represent here, what are its units and how the actual volume values
20,000-40,000 mm^3 converted to this range between 0 and 4?

Similarly, for surface area, color bar range is between 0 and 0.9 when
actual values range around 11000-14000 and for cortical thickness, color
bar range is between 1 and 3 when actual values range around 2.1-3 mm.

Any help please.

Thanks.
___
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The information in this e-mail is intended only for the person to whom it is
addressed. If you believe this e-mail was sent to you in error and the e-mail
contains patient information, please contact the Partners Compliance HelpLine at
http://www.partners.org/complianceline . If the e-mail was sent to you in error
but does not contain patient information, please contact the sender and properly
dispose of the e-mail.