Internal working/Cost function minimization or implementation of Mask thing while Registration

[Anmol Namdev]

Hello everyone, 

I am currently using the elastix for the Non-rigid registration of 2 volumes of Head & Neck cancer dataset. I am also using the Fixed and Moving volumes Masks to skip registrations in some portions. 

Now the non-rigid registration without a mask is simple to understand and quite intuitive as the cost function which is being minimized is known.

But when I am using the masks, I want to know as to how internally it is working/implemented. I am not able to figure out the internal procedure going on while non-rigid registration of 2 volumes along with the fixed and moving volumes Masks. 

Can someone help me in understanding the internals and theory behind them. It is really very urgent.

Hope to get a response soon.

Thanks

Anmol Namdev

[Anmol Namdev]

KINDLY SOMEONE HELP PLEASE