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Date Posted: 15:25:20 12/17/02 Tue
Author: Mark Elliott
Subject: Re: x offset in BOLD data
In reply to: Dan Kimberg 's message, "x offset in BOLD data" on 14:25:00 12/17/02 Tue

Dan,
We've got to get at least one other person to use this bulletin board. Otherwise, this is just a really inconvenient way to do email.

As to your shift observation, I haven't observed this. But I also haven't looked for it. My reaction is that you shouldn't be seeing this if the techs aer careful to use the same slice positions (at leat in X-Y) between the structurals and the EPIs. About how big is the shift? If it's about 4 pixels or less (in structural pixel units), then it MIGHT just be from the interpolation of the EPIs (64x64) up to the structural size (256x256) when displaying. Many algorithms do this by "anchoring" to the left when they interpolate up in size. But then one would expect to see a shift in the vertical direction as well.
I'll look at some of my data to see if I observe the same thing.

Mark.

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