Hi Rita, I would not automatically assume that regarding slice ordering with "interleaved" acquisitions, as I don't think that there is necessarily any "standard" that different manufacturers are committed to following. It is actually a non-trivial issue -- e.g., how do scanner choices regarding acquisition mode, image numbering, and direction of graphical slice prescription all relate to each other. You might be able to check with an engineer/technician for your particular platform and confirm how it is done on that platform for your chosen protocol, acquisition parameters, and way of doing slice prescription. But probably easiest to just figure it out empirically by acquiring 4-5 slices (select an even or odd number to match your desired protocol) with a large slice gap and a long TR (e.g., 10 sec), and having the subject rotate his/her head far to the left following the collection of the first slice. The slice acquired first temporally is then easily identified as the non- rotated slice.
cheers, -MH On Tue, 2011-02-08 at 11:41 -0500, Rita Loiotile wrote: > If my BOLD scan has 30 slices in "interleaved" series, can I assume > the slice order is 1,3,5,7,9...29,2,4,6,8..30? In other words, > 1:2:30,2:2:30? > _______________________________________________ > 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 mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
