[名词解释] 虹膜根部离断

试述麻醉方法的分类。 灰阶断面图像的伪影(伪差)有() ["A．混响","B．部分容积效应","C．旁瓣效应","D．折射声影","E．声速差异伪像"] 眼球破裂 引起闪烁伪像的原因包括() ["A．大血管搏动","B．结石","C．呼吸运动","D．组织震颤","E．心脏搏动 "] 外伤性瞳孔扩大 虹膜根部离断