Instead of using a regular "visible light" spotlight, let's start using a
special top-secret Pentagon "x-ray spotlight." X-rays don't get absorbed as
easily as visible light rays do.
Yeah, some x-rays get through, depending upon what they're going through.
Aha! Just like I said, it's easier to rotate the thing you're looking at
rather than the whole machine.
You're right. However, real CAT scan machines rotate around in a circle, while
the person being CAT scanned lies still. But if you think about it, spinning
the machine is exactly the same as spinning the person. It's just that
machines don't get dizzy (or sick...).
And every time I turn it I get a slightly different shadow. But how am I
supposed to keep track of all this in my head? If I couldn't actually see
inside the box, I would have no idea what I was looking at!
That's where the computer comes in handy.