Contrast free arterial spin labeling approach is used to assess the perfusion changes in PCI in the elderly group (>80yrs)compared with normal control elderly group. Lower perfusion level was seen in PCI group, also a long PLD time is more effective in detecting the PCI group in case of slower perfusion rate. The lower level of increment with a long PLD in PCI group also indicates the weakened perfusion ability in the posterior circulation.
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