[MINC-users] mincmath -percentdiff

[Ji Hyum KO]

Hi,

It worked!
Additionally, I used a mask for the striatum, and it worked, too.

Thanks!

Ji Hyun

On Wed, 21 Nov 2007, Andrew Janke wrote:

> Hi,
>
> I suspect that your second volume has a few voxels in it that are 0.
> Thus you will get range problems.
>
> There are a few ways around this but something like this should work
>
>    minccalc -expression "(abs(A[1]) < 0.0001) ? 0 : (A[0]-A[1])/A[1]*100" ....
>
>
> a
>
> On Nov 21, 2007 9:57 AM, Ji Hyum KO <kojinet at bic.mni.mcgill.ca> wrote:
> > Hello,
> >
> > mincmath -percentdiff A_BPmap1.mnc A_BPmap2.mnc A_BPdiff.mnc
> >
> > This command should give me the precentage difference of BPmap2.mnc
> > compared to BPmap1.mnc, but it gives right values for subject A, but not
> > for subject B.
> >
> > For subject B, all the values in the minc file is set to 3796.17 except
> > several dots and those dots were set to some wierd value as well.
> >
> > I tried to use minccalc to do the same operation, -expression
> > '(A[0]-A[1])/A[1]*100', but it gave me the same result.
> >
> > The input files were the binding potential map of raclopride, and they
> > were generated by RPM. The images were transformed to Talairach space using
> > pet_resample (mritotal and mritopet). The transformation was manually
> > adjusted and added to the original xfm files.
> >
> > The PET images were obtained outside of MNI.
> >
> > Both subject A and B were scanned in the same scanner.
> >
> > Could you help me to fix this problem?
> >
> > Thanks,
> >
> > Ji Hyun
> > _______________________________________________
> > MINC-users at bic.mni.mcgill.ca
> > http://www.bic.mni.mcgill.ca/mailman/listinfo/minc-users
> >
>
>
>
> --
> Andrew Janke   (a.janke at gmail.com || http://a.janke.googlepages.com/)
> Canberra->Australia    +61 (402) 700 883
> _______________________________________________
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>