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1. I think this is something you'll need to do on a case-by-case basis. The example you posted doesn't look *too* bad, and I think Segmentation will do fine. I can't give any specific rejection criteria; I always use my own judgment and if I think the anatomical scan was bad, I will repeat it at the end of the study.

2. No, I wouldn't. If you reject the anatomical scan, you won't be able to do volumetrics (probably), but you can still keep the functionals.
On 06/03/2014 11:54 AM, Ananth Narayanan wrote:
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Hello all, 

I am encountering some mild to severe ringing and blurring in the anatomical T1 scans in my study. I have attached 2 files with screenshots of these observations (different subjects). My question is, at what point do these artifacts start to prevent proper coregistration (to functional) and segmentation/normalization to template (using TPMs in segmentation)? What is the rejection criteria for the anatomical scans with artifacts? Obviously we want to reject as little as possible and use a maximum subset of the data, but when do I draw the line? What are the variables that I consider for rejection? 

Secondly, I have some studies that have artifacts in the anatomical scan, but with pretty good functional scans, no venetian blinds or anything readily observable. If I disapprove the anatomicals, should I automatically disapprove the functionals? Is it possible to salvage them in some way? Thanks in advance!
'Sincerely,
- Ananth