摘要：CT图像产生环形伪影是Optima CT520Pro 16排螺旋CT机常见故障之一,造成和引起环形伪影的因素很多,要排除此类故障,必须找到其产生的原因。在排除故障过程中,有时可能几个因素互相牵制或同时存在,必须按一定的程序,逐步查找,直至最后排除故障,使CT图像恢复正常。
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