We’ve talked about digital subtraction angiography before… taking X-ray images and using a computer to remove everything you *don’t* want to see.
This image, of aortal blockage caused by Leriche Syndrome (the aorta is occluded near the kidneys, causing thigh pain, muscle atrophy, and impotence), was made by Wikimedia Commons user Hellerhoff, who has other images of our interior world.