Hi Tyler,
I'm not sure about the first question, but for the second, one is removing
the mean from the field map to remove a bulk translation of the image.
Peace,
Matt.
-----Original Message-----
From: FSL - FMRIB's Software Library [mailto:[log in to unmask]] On Behalf
Of Tyler Blazey
Sent: Monday, February 28, 2011 3:18 PM
To: [log in to unmask]
Subject: [FSL] Questions about FEAT Field Map Script
Hi,
I have a few questions about how the FEAT GUI uses prelude and fugue for
field map correction First, looking at the log file, the script the GUI
launches runs several commands to create a more aggressive mask than is
inputed. How necessary is this? I copied all the commands in the log
excluding the masking commands, and couldn't notice much of a difference.
Second, at one point the script launches fslstats ( fslstats FM_UD_fmap -k
FM_UD_fmap_mag_brain_mask -P 50 ), and then subtracts the result from the
field map. What exactly is the purpose of this?
Thanks in advance for any help,
- Tyler Blazey
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