Patients are given radioactive tracers (via an IV or inhaled as a gas) that send out signals, which are picked up and deciphered by the PET scanner.

• 病人通过静脉注射或者吸入的方式被给予放射性示踪剂，然后放射性示踪剂发射出的射线可以被PET探测器探测到并解码。