PET scan
noun [ C ] uk/ˈpet skæn/ us/ˈpet skæn/
正电子发射计算机断层摄片（positron emission tomography scan的缩写）
abbreviation for positron emission tomography scan: a medical test that can produce an image of the brain or of another part of a person's body
The researchers carried out a PET scan to monitor his brain activity. 研究人员采用正电子计算机断层摄片来监看他的大脑活动。