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? I.e., Im2's intensity follows Im1's > intensity? > > Many thanks > > AJ > _______________________________________________ > Freesurfer mailing list > Freesurfer@nmr.mgh.harvard.edu > https://secure-web.cisco.com/1MddmNxzpm7K_dUp9KAdh-1y7LMeorgLFMIczH4RUjrPkHFi5GYXEIN5oOvrd9DWwq58ovjEgn3amynpRCVb-XsblTkzZLhVFDs34MrvbFk8flj9FKM-XKlFqw4tDF9oEIG7gSf2cruWMBKKg3DZbVxL99CRqoHuDQTLUf7dI69chmio_ivph5aQu-KtpVmM1Tvh0e0sV9AnrYMdcJjqBgc2CEtH2LgiSBumdV1OAIhQzc_axqQjLxGzd8Bd2sFJG98cgQ_4u-ob0kh-cy6K57A/https%3A%2F%2Fmail.nmr.mgh.harvard.edu%2Fmailman%2Flistinfo%2Ffreesurfer > 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 Mass General > Brigham Compliance HelpLine at > http://secure-web.cisco.com/1CGTcPlzVh7azBeQXbhtBR-yp3JBMGe_NQtLxcgxPmw--DXowonWvUKI57FKlZef6-rAJseGDzNIMpQg58xrdVm-m-m76gb7WvJ6pIX6_whCEYefkBHGgc7-QACgz_mGcg4m4ag4ljFcXNxKbpBs0kpvQT93XcdDrPpmu-etQ63LvEmy3B9SVIYZJej5pi-mucbzOR8QiOdpjG8kO9hWUx0pHm_78keP5YdDwa7_xT5ye00t_80EZf3Oj7m05eqcjBDNVFJ7PKYahrpoc9PuTIg/http%3A%2F%2Fwww.massgeneralbrigham.org%2Fcomplianceline > . 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. > Please note that this e-mail is not secure (encrypted). If you do not > wish to continue communication over unencrypted e-mail, please notify the > sender of this message immediately. Continuing to send or respond to > e-mail after receiving this message means you understand and accept this > risk and wish to continue to communicate over unencrypted e-mail. >
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