/diy/ - Do It Yourself

Follow-up question: I've noticed that dental xrays like pic related appear to operate without any backing phosphor plate; presumably there is some image sensor (or equivalent assembly) in the emitter and it's measuring particles that bounce back rather than particles that go through the subject. Is this accurate? Would this be suitable for a DIY CT scanner, provided the subjects being scanned are similar scale to a human jaw (what a dental xray is designed for)? If so, how does one obtain the actual image captured by a dental xray?