美国纽约大学医学院的莉萨·墨斯科尼和其同事使用正电子发射断层成像(Positron Emission Tomography,PET)技术，对53名正常的中老年人进行了脑部扫描。
Lisa Mosconi and colleagues at the New York University School of Medicine used positron emission tomography, or PET, scans to look at the brains of 53 normal elderly people.
扫描利用了一种叫做正电子发射X射线层析照相术(PET)的技术。 扫描用以监测脑中代谢葡萄糖（脑正常工作需要的营养物）的变化。
The scans, which used a technique called positron emission tomography (PET), were designed to monitor changes in the way the brain metabolised glucose, the fuel it needs to function.
反物质云由于其自身发射的伽玛射线而显现出来，当单个的反物质粒子遇到它们正常物质的对应体（这里是正电子遇到电子）彼此互相消灭了对方。
The cloud shows up because of the gamma rays it emits when individual particles of antimatter, in this case positrons, encounter electrons, their normal matter counterpart, and annihilate one another.
如不采取措施，几乎所有的电子、电气设备电源线的传导发射都得超标，它严重地威胁着其他设备的正常工作。
Conducted emissions on power leads of all electronic and electric equipments would nearly exceed limits that are specified in the standard, if effective measures are not adopted.
在以半腔为首腔的边耦合驻波加速管中观察到了电子反轰现象，由于电子反轰的结果，导致电于枪发射电流非正常增长。
The electron back bombardment phenomenon, which results in anomalous increase of gun current emission, has been observed in a series of our side coupled standing wave accelerating tubes.
目的：以正常人为测试对象，应用正电子发射计算机断层成像(PET)评定贴敷式局部亚低温对人脑葡萄糖代谢的影响。
AIM: to evaluate the effect of local mild hypothermia on glucose metabolism in human brain of health persons with positron emission tomography (PET).
目的：对正常人运动上肢前后行脑18F-氟脱氧葡萄糖（18F-FDG）正电子发射计算机体层摄影（PET），在活体显示脑内运动所激发的功能脑区。
Objective To show the brain functional regions participating in the upper limb movement in the health subjects with 18F-Fluorodeoxyglucose (18F-FDG) PET imaging.
目的：对正常人运动上肢前后行脑18F-氟脱氧葡萄糖（18F-FDG）正电子发射计算机体层摄影（PET），在活体显示脑内运动所激发的功能脑区。
Objective To show the brain functional regions participating in the upper limb movement in the health subjects with 18F-Fluorodeoxyglucose (18F-FDG) PET imaging.
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