[Insight-users] Can metrics handle nodata/void data values ?

[Carolyn Johnston]

I haven't found anything about this yet, either online or in the 
software guide...

I have data that contains void (no data available) pixels. I am 
wondering whether it is possible to identify their values to a metric, 
and have it handle them appropriately. For example, if the mean squares 
metric sees a nodata value in either the fixed or moving image, it might 
just skip over that point. (I realize this would create normalization 
problems for the metric, but this is just an example). Or nodata values 
could be replaced by white noise in the metric calculation, if 
normalized correlation were the metric in use.

Is anything like this already in place in Insight?

thanks,
Carolyn