Dear Paul and all,
Thank you very much for your suggestion.
(I used the word "reverse" to mean "Spiral-In".)
It's quite helpful and very much appreciated.
With best regards,
yuko
>Dear Yuko,
>
> You may want to check out the paper by Glover and Law (MRM 2001) on
>Spiral-In/Out imaging. They found it's best to go both ways--and I'm not
>sure what you mean by "reverse" spiral.
>
> Spiral has a fair size artifact in the corners of the images (about 20%
of
>max signal), but it's outside the head so it doesn't matter. When I check
>for artifacts, I use a special masking program (called art_automask) to
>cancel out those corners. The software with that program is at
>http://cibsr.stanford.edu/tools/ArtRepair.htm, if it would be helpful.
>
> - Paul
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