How is 3D multi-modal medical image registration using mutual information implemented in MATLAB?

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Hi,
I want to see the implementation of mutual information based 3D multi-modal medical image registration in MATLAB. While step-running through the imregister function, I have found that it calls a function named imregtform, where the required transformation is computed. Specifically, in imregtform, there is a call to images.internal.builtins.reg, which outputs the transformation. However, I cannot access images.internal.builtins.reg.
Is there a way by which I can access the code written in images.internal.builtins.reg? I need the following information from the code:
  1. How is difference in size of the two images handled in the code?
  2. How is difference in resolution of the two images handled in the code?
  3. How is difference in Region of Interest (ROI) handled in the code?

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