Although various methods have been used to measure cerebral perfusion including PET, SPECT, xenon CT, and TCD, these require the patients to remain still for a long period.
尽管已经有很多方式用于测量大脑灌注，包括PET、SPECT、氙ct和TCD，但是这些要求患者较长一段时间保持静止。
We are building a research oriented database of TCD (RODT).
我们正在建立一个面向研究的中药数据库。
When a "Low carrier flow" alarm remains active for 30 seconds, turns the plasma or TCD off.
当一个低载气流量报警出现有30秒时，等离子体或者TCD关闭。
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