A new imaging agent that homes in on the gummy plaques and tangles that jam up the brains of Alzheimer patients has allowed doctors to see the disease in a living person for the first time, researchers said Wednesday.

• 本周三，研究人员说，一种能瞄准阿尔茨海默氏病患者脑损伤混乱团的造影剂，使医生首次能在患者活着时就了解病变情况。