Re: [Freesurfer] Collecting 2 T1s Best?
Hi Alessandra it's really an empirical question. If 1 image has sufficient SNR/CNR, then adding a second doesn't always help (as it induces some blurring due to interpolation). But if your single image is noisy, which it might be at 0.8 iso, then a second will help. You might try it on one or two subjects and see what you think. An alternative, if you are not already getting them, would be a T2-space or FLAIR T2-space, which can help avoid dura and such cheers Bruce On Wed, 7 Mar 2018, Alessandra Macbeth wrote: Hi there, I know in the past, it was recommended to acquire 2 T1 scans so that they could be averaged for better SNR, etc. in order to improve cortical thickness and surface area measurements. Is this still the recommendation? We have a few extra minutes in our scanning protocol and are debating whether to include a 2nd T1. Our parameters are: MPRAGE with .8mm^3 voxel size, slice thickness of .8, FA = 8 degrees, TR = 2400ms, TE = 2.72ms, TI = 1060ms. Best, Alessandra -- Alessandra Macbeth, M.A. Doctoral Candidate - Department of PsychologyUniversity of California, Riverside ___ 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.
Re: [Freesurfer] Collecting 2 T1s Best?
Are you getting a 0.8mm isotropic T2w or FLAIR? You would probably get better mileage out of a different type of scan that can help exclude dura and blood vessels if you aren’t already getting one. Also what coil are you using? I might prefer a TI=1000ms simply because it spreads the CSF, GM, and WM histogram peaks out a little more evenly, whereas 1060 will have GM and WM closer together than GM and CSF. Peace, Matt. From: mailto:freesurfer-boun...@nmr.mgh.harvard.edu>> on behalf of Alessandra Macbeth mailto:alessandramacb...@gmail.com>> Reply-To: Freesurfer support list mailto:freesurfer@nmr.mgh.harvard.edu>> Date: Wednesday, March 7, 2018 at 1:29 PM To: "freesurfer@nmr.mgh.harvard.edu<mailto:freesurfer@nmr.mgh.harvard.edu>" mailto:freesurfer@nmr.mgh.harvard.edu>> Subject: [Freesurfer] Collecting 2 T1s Best? Hi there, I know in the past, it was recommended to acquire 2 T1 scans so that they could be averaged for better SNR, etc. in order to improve cortical thickness and surface area measurements. Is this still the recommendation? We have a few extra minutes in our scanning protocol and are debating whether to include a 2nd T1. Our parameters are: MPRAGE with .8mm^3 voxel size, slice thickness of .8, FA = 8 degrees, TR = 2400ms, TE = 2.72ms, TI = 1060ms. Best, Alessandra -- Alessandra Macbeth, M.A. Doctoral Candidate - Department of Psychology University of California, Riverside ___ 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.
[Freesurfer] Collecting 2 T1s Best?
Hi there, I know in the past, it was recommended to acquire 2 T1 scans so that they could be averaged for better SNR, etc. in order to improve cortical thickness and surface area measurements. Is this still the recommendation? We have a few extra minutes in our scanning protocol and are debating whether to include a 2nd T1. Our parameters are: MPRAGE with .8mm^3 voxel size, slice thickness of .8, FA = 8 degrees, TR = 2400ms, TE = 2.72ms, TI = 1060ms. Best, Alessandra -- Alessandra Macbeth, M.A. Doctoral Candidate - Department of Psychology University of California, Riverside ___ 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.
