| The inability to measure where an annihilation photon interacts within a detector crystal limits PET resolution uniformity by blurring the outer regions of the image.; This problem is solved by dividing a scintillation crystal along its length into two regions, by a black absorbing band, that are equally likely to absorb a PET photon. Light collected from the front and back of the crystal allow the region of photon interaction and photon energy to be determined, using dual parameter acquisition.; The design was tested by sweeping a radiation beam across a bismuth germanate crystal detector. The percentage of incorrectly positioned events was no more than 10% and the energy signal amplitude varied by less than 6%. |
