there might be. The problem with having all one group from one scanner and all other other group from another scanner is that you cannot tell what is due to scanner and what is due to group.
On 05/30/2017 11:50 AM, Dr Sampada Sinha wrote: > Thanks Dr Greve for your reply. I understand it can be taken into > account if study group is the same and different scanner is used on > the same group. So does it mean there is a differential change in > volume depending on the field strength? > > Appreciate your help. > > Kind regards, > > Sam > > On Tuesday, May 30, 2017, Douglas Greve <gr...@nmr.mgh.harvard.edu > <javascript:_e(%7B%7D,'cvml','gr...@nmr.mgh.harvard.edu');>> wrote: > > You do need to take it into account, but you cannot if one group > is 1.5T and the other is 3T. > > > > On 5/28/17 10:41 AM, Dr Sampada Sinha wrote: >> Dear freesurfer experts, >> >> I am presently trying to calculate hippocampal volume for two >> different study groups. One study group images (MDD) was acquired >> on 1.5T and the other age-matched study group (Healthy >> controls) on 3T MRI. On doing the statistics I have significant >> differences in the hippocampal volume correlating with their >> cognitive scores between the two study groups. Do I need to take >> into consideration different scanner parameters when doing the >> statistics? How do I go about it? >> >> Thanks for your help. >> >> Kind regards, >> >> Sam >> >> -- >> Dr Sampada Sinha >> Research medical scientist (B) >> Department of Geriatric Mental Health (DGMH) >> King George Medical University >> Lucknow-226003 >> , Uttar Pradesh >> India >> >> >> >> >> >> >> */ >> /* >> >> >> >> _______________________________________________ >> Freesurfer mailing list >> Freesurfer@nmr.mgh.harvard.edu >> https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer >> <https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer> > > -- > Dr Sampada Sinha > Research medical scientist (B) > Department of Geriatric Mental Health (DGMH) > King George Medical University > Lucknow-226003 > , Uttar Pradesh > India > *//* > > _______________________________________________ > Freesurfer mailing list > Freesurfer@nmr.mgh.harvard.edu > https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer -- 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/ _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer 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 Partners Compliance HelpLine at http://www.partners.org/complianceline . 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.
