背向散射回声强度的射频测定在超声造影技术上有什么用途
A.用以定量评价超声造影效果
B.加速血流速度
C.增大血流量
D.增强超声造影效果
E.消除超声造影的副作用
参考答案:A
下列哪项不是急性根尖周炎的病理变化()
A.根尖牙周膜血管扩张充血
B.根尖牙周膜形成脓肿
C.根尖牙槽骨死骨形成
D.根尖牙槽脓肿
E.根尖牙周膜坏死
It is reasonable to assume that demand for sophisticated emergency medical treatment is higher in Jerusalem, where terrorist bomb attacks were frequent incidents.