中膜层病理学改变是可逆性的，但已失去血管舒缩功能，仅具生物支架作用。
The pathological changes of tunica media were reversible, without vasomotion and play a stent role only.
TCD直接显示脑动脉的主干，对头晕、头痛患者脑血管舒缩状况及脑供血改变评价较好。
But TCD detected the flow of main cerebral artery, good at assessing vasomotor reactivity and cerebral hemoperfusion on patients suffered from vertigo and headache.
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