Nuclear magnetic resonance ( nmr ) and magnetic resonance imaging ( mri ) technologies are widely used for physical , chemical , material and biomedical analysis and medical diagnosis 摘要核磁共振波谱和核磁共振成像技术( mri )已经成为一种广泛应用于物理、化学、材料、生物医学等领域的重要研究工具和医疗诊断手段，但是仪器复杂、价格昂贵。
One researcher has even proposed a way to determine the temperatures of internal organs , by using mri to monitor per fluorocarbon liquids injected into the blood and carried to various parts of the body 一位研究者甚至还提出一种方法来测定人体器官的温度，即将全氟化碳液体注入血液中，当这种液体被携带到人体各个部分时用核磁共振成像监测。
At the beginning the thesis indicates the crux of nmr imaging is the homogeneity of the static magnetic field through introducing the basic principle of nmr imaging and presents the requirement of the satisfying imaging 首先，本文介绍了核磁共振成像的基本原理，指出样品区静磁场的均匀度是核磁共振成像的关键所在，并给出了满足成像要求的条件。
By using time - resoled fmri , we can see its signature in the brain , ” he continued . “ these findings allow us to really now focus on this set of brain areas and to understand why these areas cannot process two tasks at once 通过使用实时功能核磁共振成像,可以看到大脑中的相关信号， ”他继续说道， “这些发现允许我们真正对这一系列大脑区域集中注意力，并进一步研究为什么这些区域不能够同时处理两件任务。 ”
Identifying the information bottleneck responsible for this dual - task limitation required the use of functional magnetic resonance imaging , or fmri , an imaging technology that reeals the brain areas actie in a gien mental task by registering changes in oxygenated blood concentration in these regions 确认双重任务限制区域需要使用功能核磁共振成像，这种成像技术通过记录特定精神活动时氧化物质的血浓度变化反应大脑区域活动。
