Objective To assess whether regional magnetization transfer ratio (MTR) changes are present in Alzheimer's disease (AD) patients and to evaluate their clinical value.

目的评价阿尔海默病（AD）患者与正常老年人脑结构磁化转移率的差异，并探讨其临床实用性。

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Results the values in SPECT radioactive count ratio and scores of neuropsychological tests were lower in the AD patients than that in normal subjects.

结果AD组各神经心理学测验量表评分及SPECT放射性计数比值均低于正常对照组。

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The simulation results indicate that the proposed protocol in mobile ad hoc networks can prolong the network lifetime, decrease the end-to-end delay and improve the network throughput ratio.

仿真结果表明，在移动自组织网络中，该能量有效的跨层协议不但能延长网络的生存时间，减少端到端延迟，而且可以提高网络吞吐率。

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Today -- as websites have multiplied exponentially -- that ratio is a fraction of what it was, while clicks-per-thousand ad rates have been slashed.

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