[Insight-users] imagetoimagemetric issue

[indian rock]

Hello all, 

I want to calculate the metric of how one image (A1.img) fits the
second image (T2.img) prior to any registration or transformation.

I want to identify the closest match to image T2.img, from a stack of
images (A1.img - A10.img), without any transformation performed on the
moving image. Is there a component/metric to do this..???

Thanks,
IR.