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正电子发射断层显像（Ｐｏｓｉｔｒｏｎ ｅｍｉｓｓｉｏｎ ｔｏｍｏｇｒａｐｈｙ、ＰＥＴ）是一种能给出放射性核素在体内分布图像的显像技术。正电子发射核素是人体天然组成元素的同位素，在体内局部的浓度直接反映生化状况；疾病发展的过程是生化和生理的改变在先，形态结
Positron emission tomography (PET) is a imaging technique that gives images of radionuclides in the body. Positron-emitting radionuclides are isotopes of the natural elements of the human body, and local concentrations in the body directly reflect biochemical conditions; the process of disease development is biochemical and physiological changes in the first, morphological knot