[Mristudio-users] AIR/MI/theory AIR, which is the best?

[susumu mori]

If the scans are not co-registered (the subject went out and came back to
the scanner), I suggest you to calculate the tensor first and register the
tensor using DiffeoMap and linear registration (AIR or MI).

If you register the raw DWI data, you may get a bit better SNR (this is my
guess), but you have to make sure to use the b-table re-orientation scheme
in the AIR. I would recommend to use AIR or MI (MI may take a lot of time),
although I don't have much experience in the cross-scan registration.

I think the first method (calculate tensor and then register) is the
easiest.

On Thu, Aug 11, 2011 at 6:35 PM, Min Liu <mliu4 at ualberta.ca> wrote:

> Dear MRIStudio users,
>
> I have four human brain datasets that are scanned sequentially (back
> to back) of a single subject using the same DTI protocol. I want to
> get an averaged dataset out of the four. Before doing that,
> motion/eddy current correction is definitely needed. I am wondering
> among the three methods provided by DTIStudio, i.e. AIR/MI?theory AIR.
> By visual inspection, there is rotation/shifting between the very
> first dataset and the very last by about 2 voxels. For this subtle
> movement, is there a conclusion so far regarding which coregistration
> is the best (without introducing errors! Sometimes AIR does more harm
> than good by misalignment.) Thank you for your thoughts!!
>
> Min
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