An probe body comprising: one or more light sources； one or more light sensors； an x-ray detector configured to detect, using at least one of the one or more light sensors, light from a scintillator for converting extra-orally applied x-rays to light； and a lower energy light detector configured to detect, using at least one of the one or more light sensors, light from an object illuminated by at least one of the one or more light sources.
