Although arious methods hae 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。