Well our primary reason for using this sequence is to better delineate the amygdala.
On Wed, Feb 2, 2011 at 5:03 PM, Bruce Fischl <fis...@nmr.mgh.harvard.edu>wrote: > what do you want to do with the echoes? > > On Wed, 2 Feb 2011, Douglas N Greve wrote: > > Hi Carl, you're probably better off taking the RMS (root-mean-square) of >> the echoes rather than averaging them together. Our scanner outputs >> these in addition to the echoes, but they are easy to compute with calls >> to mri_concat. >> >> doug >> >> btw, you can't really have motion between the echoes. All four echoes >> for each line of k-space are acquired within 20ms of each other. >> >> Carl Anderson wrote: >> >>> Dear Freesurfer, >>> >>> I am concerned that I may not be processing the MEMPRAGE images to >>> full take advantage of the T2* info in the multi-echos. >>> >>> I have been separating each echo as 001.mgz, 002.mgz, 003.mgz & >>> 004.mgz when using recon-all. This works well if motion exists in any >>> of the individual echos. >>> >>> However of late, I have noticed a that a reference was made to the >>> problem of losing T2* info by differential scaling in the archive if a >>> particular file format "memprage_echo0.mgz" was not used. >>> >>> Here is the link to the archive note: >>> http://www.mail-archive.com/freesurfer@nmr.mgh.harvard.edu/msg15303.html >>> >>> It has been hard to identify a difference between our standard MPRAGE >>> images and the MEMPRAGE images (we currently collect both on our >>> Siemens 3T 32 channel system). >>> >>> Am I processing the MEMPRAGE correctly? >>> >>> Thanks! >>> >>> -- >>> >>> <<ÿÿ>>~<>~<<ÿÿ>>~<>~<<ÿÿ>>~<>~<<ÿÿ>>~<>~<<ÿÿ>>~<>~<<ÿÿ>>~<>~<<ÿÿ>>~<>~<<ÿÿ>> >>> >>> Carl M. Anderson, Ph.D. (mail stop 204) >>> Assistant Professor of Psychiatry, >>> Harvard Medical School & >>> The Neuroimaging Center, >>> McLean Hospital 115 Mill St. Belmont, MA 02478 >>> Ph: 617-855-2972; Fax: 617-855-2770 >>> e-mail: remfr...@gmail.com <mailto:remfr...@gmail.com>; >>> carl_ander...@hms.harvard.edu <mailto:carl_ander...@hms.harvard.edu> >>> >>> <<ÿÿ>>~<>~<<ÿÿ>>~<>~<<ÿÿ>>~<>~<<ÿÿ>>~<>~<<ÿÿ>>~<>~<<ÿÿ>>~<>~<<ÿÿ>>~<>~<<ÿÿ>> >>> >>> >>> ------------------------------------------------------------------------ >>> >>> _______________________________________________ >>> 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. > -- <<•>>~<>~<<•>>~<>~<<•>>~<>~<<•>>~<>~<<•>>~<>~<<•>>~<>~<<•>>~<>~<<•>> Carl M. Anderson, Ph.D. (mail stop 204) Assistant Professor of Psychiatry, Harvard Medical School & The Neuroimaging Center, McLean Hospital 115 Mill St. Belmont, MA 02478 Ph: 617-855-2972; Fax: 617-855-2770 e-mail: remfr...@gmail.com; carl_ander...@hms.harvard.edu <<•>>~<>~<<•>>~<>~<<•>>~<>~<<•>>~<>~<<•>>~<>~<<•>>~<>~<<•>>~<>~<<•>>
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