External Email - Use Caution Great. Many thanks for your suggestions. My best Aj
On Wed, Jul 21, 2021, 12:31 Fischl, Bruce <bfis...@mgh.harvard.edu> wrote: > There isn’t really anything available for the latter approach. I would > suggest the former and potentially including site as a nuisance variable. > You very much want to balance across site in terms of whatever effect you > are looking for (e.g. don’t scan all your patients on one and all your > controls on the other) > > > > Cheers > > Bruce > > > > *From:* freesurfer-boun...@nmr.mgh.harvard.edu < > freesurfer-boun...@nmr.mgh.harvard.edu> *On Behalf Of *AJ > *Sent:* Wednesday, July 21, 2021 1:15 PM > *To:* Freesurfer support list <freesurfer@nmr.mgh.harvard.edu> > *Subject:* Re: [Freesurfer] Intensity equalization > > > > * External Email - Use Caution * > > Thank you so much for your reply. > > > > I have subjects who got MRIs on either GE or PH. There are mild image > intensity differences between the two scanners. To combine volumetric data > from both scanners, an easier way would be to express volumes as percentage > of sbTIV (a less variable measure than eTIV) from respective scanners using > SAMSEG. Or more involved process would be intensity normalization of scans > to each other and then subsequent SAMSEG analysis. I think the former > approach is easier and still valid? The later approach would require an > additional program, if you would suggest one? > > > > Many thanks > > > > AJ > > > > On Wed, Jul 21, 2021, 09:40 Fischl, Bruce <bfis...@mgh.harvard.edu> wrote: > > Hi AJ > > > > No, not easily. Maybe you can tell us your overall goal to see if we can > help? > > > > Cheers > Bruce > > > > *From:* freesurfer-boun...@nmr.mgh.harvard.edu < > freesurfer-boun...@nmr.mgh.harvard.edu> *On Behalf Of *AJ > *Sent:* Wednesday, July 21, 2021 1:27 AM > *To:* Freesurfer support list <freesurfer@nmr.mgh.harvard.edu> > *Subject:* [Freesurfer] Intensity equalization > > > > * External Email - Use Caution * > > Hi, > > I have 2 MRIs on different scanners. The tissue contrasts are slightly off > and there is slight differences in the volumes of ROIs. Is there a way to > make both MRIs have the same intensity? 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