METHODS: the experiment was completed in the Renji Hospital affiliated to Shanghai Second Medical Unviersity.

方法：实验在上海第二医科大学附属仁济医院完成。

SETTING Department of Anesthesia of Renji Hospital Affiliated to Shanghai Second Medical Scientific University.

上海第二医科大学附属仁济医院麻醉科。

Shanghai 200233; 2. Department of Nuclear Medicine; Renji Hospital Affiliated to Shanghai Jiao Tong University;

上海交通大学附属仁济医院核医学科；