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
> <greve@nmr.mgh.harvard.edu <mailto:greve@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
>     > <greve@nmr.mgh.harvard.edu <mailto:greve@nmr.mgh.harvard.edu>
>     <mailto:greve@nmr.mgh.harvard.edu
>     <mailto:greve@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
>     > greve@nmr.mgh.harvard.edu <mailto:greve@nmr.mgh.harvard.edu>
>     <mailto:greve@nmr.mgh.harvard.edu <mailto:greve@nmr.mgh.harvard.edu>>
>     >     Phone Number: 617-724-2358 <tel:617-724-2358>
>     <tel:617-724-2358 <tel:617-724-2358>>
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>     <tel:617-726-7422>>
>     >
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>     <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>>
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>     <ftp://surfer.nmr.mgh.harvard.edu/transfer/outgoing/flat/greve/>
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>     >
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>     --
>     Douglas N. Greve, Ph.D.
>     MGH-NMR Center
>     greve@nmr.mgh.harvard.edu <mailto:greve@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
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>     Outgoing:
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>     <ftp://surfer.nmr.mgh.harvard.edu/transfer/outgoing/flat/greve/>
>
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--
Douglas N. Greve, Ph.D.
MGH-NMR Center
greve@nmr.mgh.harvard.edu
Phone Number: 617-724-2358
Fax: 617-726-7422

Bugs: surfer.nmr.mgh.harvard.edu/fswiki/BugReporting
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