That does not get computed. You can do it in matlab with something like
f = MRIread('f.nii.gz');
fmn = mean(f.vol,4);
fmnrep = repmat(fmn,[1 1 1 size(f.vol,3)]);;
s = f;
s.vol = f.vol./fmnrep;
MRIwrite(s,'percentchange.nii.gz')
On 02/15/2018 02:03 PM, Sarah Cole wrote:
> Yes, that's exactly what I am looking for. Raw waveform as a percent.
>
> On Thu, Feb 15, 2018 at 1:00 PM, Douglas N Greve
> <gr...@nmr.mgh.harvard.edu <mailto:gr...@nmr.mgh.harvard.edu>> wrote:
>
> h-offset is the intensity offset (basically the mean signal). h.nii.gz
> is a complicated combination of the betas (regression
> coefficients) that
> is included for backwards compatibility. What do you mean by % signal
> change? Do you want the raw waveform as a percent?
>
>
> On 02/15/2018 01:52 PM, Sarah Cole wrote:
> > Thank you, Doug.
> >
> > Sorry for not being clear. Could you please tell me what
> h.nii.gz and
> > h-offset.nii.gz are?
> >
> > Also, do you have any recommendation on how to get % signal
> change on
> > the signal intensity as oppose to % signal change on contrasts?
> >
> > Thank you
> >
> > On Thu, Feb 15, 2018 at 12:47 PM, Douglas N Greve
> > <gr...@nmr.mgh.harvard.edu <mailto:gr...@nmr.mgh.harvard.edu>
> <mailto:gr...@nmr.mgh.harvard.edu
> <mailto:gr...@nmr.mgh.harvard.edu>>> wrote:
> >
> > It divides the contast (ces) by voxel-wise mean. I'm not sure I
> > understand your quesstion about h and h-offset
> >
> >
> > On 02/15/2018 01:04 PM, Sarah Cole wrote:
> > > Hi,
> > >
> > > Could someone please let me know how to get the percent signal
> > change
> > > for raw signal intensity?
> > >
> > > I think the cespct.nii.gz gives me the contrast as %.
> However, I am
> > > not sure about dividing h.nii and h-offset.nii. What are they?
> > >
> > >
> > > Thank you
> > >
> > >
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> > --
> > Douglas N. Greve, Ph.D.
> > MGH-NMR Center
> > gr...@nmr.mgh.harvard.edu <mailto:gr...@nmr.mgh.harvard.edu>
> <mailto:gr...@nmr.mgh.harvard.edu <mailto:gr...@nmr.mgh.harvard.edu>>
> > Phone Number: 617-724-2358 <tel:617-724-2358>
> <tel:617-724-2358 <tel:617-724-2358>>
> > Fax: 617-726-7422 <tel:617-726-7422> <tel:617-726-7422
> <tel:617-726-7422>>
> >
> > Bugs: surfer.nmr.mgh.harvard.edu/fswiki/BugReporting
> <http://surfer.nmr.mgh.harvard.edu/fswiki/BugReporting>
> > <http://surfer.nmr.mgh.harvard.edu/fswiki/BugReporting
> <http://surfer.nmr.mgh.harvard.edu/fswiki/BugReporting>>
> > FileDrop: https://gate.nmr.mgh.harvard.edu/filedrop2
> <https://gate.nmr.mgh.harvard.edu/filedrop2>
> > <https://gate.nmr.mgh.harvard.edu/filedrop2
> <https://gate.nmr.mgh.harvard.edu/filedrop2>>
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> <http://www.nmr.mgh.harvard.edu/facility/filedrop/index.html>>
> > Outgoing:
> > ftp://surfer.nmr.mgh.harvard.edu/transfer/outgoing/flat/greve/
> <ftp://surfer.nmr.mgh.harvard.edu/transfer/outgoing/flat/greve/>
> > <ftp://surfer.nmr.mgh.harvard.edu/transfer/outgoing/flat/greve/
> <ftp://surfer.nmr.mgh.harvard.edu/transfer/outgoing/flat/greve/>>
> >
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> --
> Douglas N. Greve, Ph.D.
> MGH-NMR Center
> gr...@nmr.mgh.harvard.edu <mailto:gr...@nmr.mgh.harvard.edu>
> Phone Number: 617-724-2358 <tel:617-724-2358>
> Fax: 617-726-7422 <tel:617-726-7422>
>
> Bugs: surfer.nmr.mgh.harvard.edu/fswiki/BugReporting
> <http://surfer.nmr.mgh.harvard.edu/fswiki/BugReporting>
> FileDrop: https://gate.nmr.mgh.harvard.edu/filedrop2
> <https://gate.nmr.mgh.harvard.edu/filedrop2>
> www.nmr.mgh.harvard.edu/facility/filedrop/index.html
> <http://www.nmr.mgh.harvard.edu/facility/filedrop/index.html>
> Outgoing:
> ftp://surfer.nmr.mgh.harvard.edu/transfer/outgoing/flat/greve/
> <ftp://surfer.nmr.mgh.harvard.edu/transfer/outgoing/flat/greve/>
>
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--
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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