正电子断层扫描仪进行人体扫描的时候，病人被注入正电子放射性核素，然后推入检测环。
During a PET scan, the patient is injected with radioactive tracer molecules that emit positrons when they decay.
正电子断层扫描仪进行人体扫描的时候，病人被注入正电子放射性核素，然后推入检测环。
During a PET scan, the patient is injected with radioactive tracer molecules that emit positrons when they decay.
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