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> after John's emails I'd like to be sure about a couple of things.
> 1- What matters for flipping is the handness of storage, is that correct?

Yes.

> 2- Data stored in Right hand system needs not to be flipped, while Left
> hand stored data need to be flipped.?

Yes.

> 3- To tell the handnees of the actual
> data, John suggested to look at voxel (1,1,1) for axial images. Now if
> voxel (1,1,1) is LPI my data are right hand and need not to be flipped in x
> dimension. is that correct?

Yes.

> If voxel (1,1,1) is RPI data need to be flipped
> in x dimension. is that correct?

Yes.

> thanks for any help

That was easy.

best regards,
-John