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welcome back to the course in nuclear medicine physics today were looking at pet imaging now pet stands for positron emission tomography and maybe that sounds confusing but its actually a very simple concept a positron is the component of the electron and when a positron meets an electron they annihilate they vanish and two photons appear and they get emitted back to back in the rest frame of the electron positron now if we have a ring of detectors and the photons are emitted back to back we can detect each of them and we know the line where they came from so if a type of radiation emits a positron inside your body the positron is going to travel a little bit meet an electron which are abundant in our bodies annihilate and two photons are going to come out of the body back to back this is different than spect imaging where only a single photon comes out of your body in this lecture well also look at various types of radioisotopes that emit positrons so that you can use them for pet
