PET DEVICE WITH POSITRON LIFETIME MEASURING FUNCTION, AND METHOD FOR MEASURING POSITRON LIFETIME IN PET DEVICE

摘要

A nuclide that emits positrons and then emits de-excited gamma rays is administered to an imaging target. A PET device detects the de-excited gamma rays separately from three annihilation gamma rays generated upon annihilation of positrons (ortho-positronium annihilation). On the basis of a detected energy (E_DETγ1 to E_DETγ3) and a detected position (P_DETγ1 to P_DETγ3) of each annihilation gamma ray, and a detection time (t_DETγ1 to t_DETγ3) of the annihilation gamma rays and a detection time (t_DETγE) of the de-excited gamma rays, a distribution state of the nuclide in the imaging target is derived in three dimensions and is associated with a derived distribution position to determine lifetime information of the positrons.