[Insight-users] Does registration preserve physical dimensions?

[laurent.paul at club-internet.fr]

Hi all,

I work on registration between patient/transplant.
My work will determine if the transplant has right dimensions for the patient. 
In my case, I'm wondering if the registration preserves the physical dimensions.
After the registration, both volumes have the same dimensions because there's a scale applied on the moving volume for fitting in the fixed volume.
Is this reality? I mean, is the transplant really has the same physical dimensions as the patient's organ or is this just to obtain a right registration?

Let me take an example:
fixed volume: patient's organ
moving volume: transplant
We can imagine that the transplant measures 10 cm while the patient's organ is 20 cm. 
The transplant will be scaled after the registration. Will they be exactly superposed? Is both volumes have the same height on the screen?

I've ever registered two volumes coming from the same patient, there's no problem about dimensions
because it's the same patient, the same shape, but with two different objects I don't know....

Thanks,

Laurent.