We are interested in small structures of the midbrain and would therefore like to maximize our spatial resolution, at least go smaller than 2mm isotropic. Any suggestions?
cheers seb ________________________________ From: Glasser, Matthew [[email protected]] Sent: Monday, October 31, 2016 6:25 PM To: Harms, Michael; Sebastien Hetu; [email protected] Subject: Re: [HCP-Users] FoV phase for fMRI Indeed, why do you wish to scan at 1.5mm? Cortex is 1.6mm thick at the minimum, and you have to increase the TR substantially which isn’t so good either for maximizing one’s functional CNR. Peace, Matt. From: <[email protected]<redir.aspx?REF=qwJ9kCn9wvQFB9Ak2ilGTTUnFyEvPCt5lcfldSwpCQsu9Y1Q_wHUCAFtYWlsdG86aGNwLXVzZXJzLWJvdW5jZXNAaHVtYW5jb25uZWN0b21lLm9yZw..>> on behalf of "Harms, Michael" <[email protected]<redir.aspx?REF=t0kF0U2Zx1Ws48EKSZirue0pWmiQ2iskZIB64chxkC-PVpBQ_wHUCAFtYWlsdG86bWhhcm1zQHd1c3RsLmVkdQ..>> Date: Monday, October 31, 2016 at 2:35 PM To: Sebastien Hetu <[email protected]<redir.aspx?REF=nw2DCj4lj5er1GU242cVJZAmbutwf--GKL7_dA9_LeOPVpBQ_wHUCAFtYWlsdG86c2ViaGV0dUB2dGMudnQuZWR1>>, "[email protected]<redir.aspx?REF=Rf55jWWJl_dnKkmCh_DzVGd8B0egAl1z2hn4Zw_tMoaPVpBQ_wHUCAFtYWlsdG86aGNwLXVzZXJzQGh1bWFuY29ubmVjdG9tZS5vcmc.>" <[email protected]<redir.aspx?REF=Rf55jWWJl_dnKkmCh_DzVGd8B0egAl1z2hn4Zw_tMoaPVpBQ_wHUCAFtYWlsdG86aGNwLXVzZXJzQGh1bWFuY29ubmVjdG9tZS5vcmc.>> Subject: Re: [HCP-Users] FoV phase for fMRI Off the top of my head, no. Three comments though: (1) a 204 mm in-plane FOV is rather tight; (2) 1.5 mm voxels is going to require a longer TE and echo train, and/or the use of phase partial Fourier; (3) You’re going to be rather SNR-starved at 1.5 mm isotropic at 3T. cheers, -MH -- Michael Harms, Ph.D. ----------------------------------------------------------- Conte Center for the Neuroscience of Mental Disorders Washington University School of Medicine Department of Psychiatry, Box 8134 660 South Euclid Ave. Tel: 314-747-6173 St. Louis, MO 63110 Email: [email protected]<redir.aspx?REF=t0kF0U2Zx1Ws48EKSZirue0pWmiQ2iskZIB64chxkC-PVpBQ_wHUCAFtYWlsdG86bWhhcm1zQHd1c3RsLmVkdQ..> From: <[email protected]<redir.aspx?REF=C4QgP1E05sFXZI9a3Yw7XrFFeEzPROOyxiAUIiWdXiKPVpBQ_wHUCAFtYWlsdG86aGNwLXVzZXJzLWJvdW5jZXNAaHVtYW5jb25uZWN0b21lLm9yZw..>> on behalf of Sebastien Hetu <[email protected]<redir.aspx?REF=nw2DCj4lj5er1GU242cVJZAmbutwf--GKL7_dA9_LeOPVpBQ_wHUCAFtYWlsdG86c2ViaGV0dUB2dGMudnQuZWR1>> Date: Monday, October 31, 2016 at 11:03 AM To: "[email protected]<redir.aspx?REF=Rf55jWWJl_dnKkmCh_DzVGd8B0egAl1z2hn4Zw_tMoaPVpBQ_wHUCAFtYWlsdG86aGNwLXVzZXJzQGh1bWFuY29ubmVjdG9tZS5vcmc.>" <[email protected]<redir.aspx?REF=Rf55jWWJl_dnKkmCh_DzVGd8B0egAl1z2hn4Zw_tMoaPVpBQ_wHUCAFtYWlsdG86aGNwLXVzZXJzQGh1bWFuY29ubmVjdG9tZS5vcmc.>> Subject: [HCP-Users] FoV phase for fMRI Hi, We are trying to run a fMRI sequence on our PRISMA similar to the one used in the HCP–lifespan but with 1.5mm isotropic voxels and a AP phase encoding direction. In the HCP sequence documents, it is mentioned that if we use AP phase encoding we should use a FoV phase of 100%. We seem to be unable to set our FoV phase to 100%—we can only go to 103% (with our FoV of 204 mm). Do you know how to set the sequence to have 100% available? Thank you for your help Seb _______________________________________________ HCP-Users mailing list [email protected]<redir.aspx?REF=PEhBus2E5h6v8FIYdvS0CheONZMfBZWNH6R5wOxUG06PVpBQ_wHUCAFtYWlsdG86SENQLVVzZXJzQGh1bWFuY29ubmVjdG9tZS5vcmc.> http://lists.humanconnectome.org/mailman/listinfo/hcp-users<redir.aspx?REF=TM-dcthgKf_fsfREmF-gDb0u6-0crF_bv61q9EciWcmPVpBQ_wHUCAFodHRwOi8vbGlzdHMuaHVtYW5jb25uZWN0b21lLm9yZy9tYWlsbWFuL2xpc3RpbmZvL2hjcC11c2Vycw..> ________________________________ The materials in this message are private and may contain Protected Healthcare Information or other information of a sensitive nature. 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