please write equations with full solution

course is medical imaging.

2. Digital subtraction angiography (DSA) is a technique using a digital fluorographic system. In DSA, one image (the "mask image") is obtained before an iodinated contrast agent is injected into the circulatory system. A second image (the "opacification image") then is obtained after injection of the contrast agent. The images are logarithmically transformed, then subtracted to remove anatomical background structures to isolate the contrast agent in the circulatory system (typically arteries and cardiac chambers). The geometry of the two images is summarized in the following diagrams. Show them in mathematically