Hi Daniel,
1. yes. But why not include 6 month in your study if you have those
scans??? You will get much more reliable slope estimates with 3 time
points compared to 2, so including that time point will not only help
for the image processing part, but also in your statistics (you gain power).
2. I am not familiar with the mprage flag and think it mainly affects
the normalization. If you are sure you need it, then also add it to the
-base and -long runs, just to be safe.
best, Martin
On 01/29/2014 09:08 AM, Daniel Ferreira wrote:
Dear experts,
I have two questions regarding the longitudinal stream:
- I am including Baseline and 12 months follow-up in my study.
However, I also have 6 months follow-up. I wonder if it is
conceptually right to include these 6 months scans in template
creation with the idea of increasing registration.
- I am applying the -mprage flag in the crossectional first step.
Should I use it in the -base and -longs steps too?
Thanks very much
Daniel Ferreira
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Martin Reuter, Ph.D.
Assistant in Neuroscience - Massachusetts General Hospital
Instructor in Neurology - Harvard Medical School
MGH / HMS / MIT
A.A.Martinos Center for Biomedical Imaging
149 Thirteenth Street, Suite 2301
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Phone: +1-617-724-5652
Email:
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reu...@mit.edu
Web : http://reuter.mit.edu
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