The mean peak velocity(EVe, EVa) and ratio(EVe/EVa), the mean peak strain rate(Ee, Ea) and ratio(Ee/Ea) were calculated.

• 计算前后瓣环的平均峰值速度(EVe、EVa)及比率(EVeEVa); 平均峰值应变率(Ee、Ea)及比率(EeEa)。