I want to compare two dicom images, see figures below. I want to know whether there is a difference in size between the two 'circles'. To visualize this, I want to subtract the two images to see if a 'ring' remains (something like the figure below).
However the problem is that the two dicom images have a different grayscale. So therefore I first have to equalize the two grayscales. After that I can subtract the two images (I think...?).
I hope I explained clearly what I want to achieve, I am quite new to matlab. Hope someone can help. Thanks!!