Imaging by injection of accelerated radioactive particle beams

With the availability of accelerated radioactive beams that decay by positron emission, the possibility exists of verifying a treatment plan by delivering a beam of radioactive particles in a low-dose exposure to a patient and measuring the end-of-the-beam trajectory by imaging the annihilation gamma rays from the decay of the beam particles. The development of this technique requires a gamma-ray camera of very high sensitivity, since the radiation dose received by a patient has to be kept to a minimum