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MR机图像出现伪影的故障有多种可能。例如,数据采集系统,图像重建系统,图像处理系统等。数据采集系统比较复杂,发生的故障也较多,当数据采集系统出现故障时,直接影响到图像的质量,甚至由于图像伪影而影响诊断工作。本文介绍我院一例Philips T5-2型MR机产生网纹伪影的原因及检修方法。 一、故障现象:图像出现网纹伪影,开始时网纹伪影只是偶尔出现,或一个序列出现一、二幅,重扫后网纹伪影一般都会消失,但一段时间后,所有扫描图像都有很强的网纹伪影,重扫后伪影依然出现。 二、故障分析:MR产生伪影的因素很多,根据伪影产生的原因,一般将伪影分为设备伪影,运动伪影和
There are many possibilities for the malfunction of the MR machine image artifacts. For example, data acquisition systems, image reconstruction systems, image processing systems, etc. The data acquisition system is more complex and more failures occur. When the data acquisition system fails, it directly affects the quality of the image and even affects the diagnosis due to image artifacts. This article introduces the cause and maintenance method of a mesh artifact produced by a Philips T5-2 MR machine in our hospital. First, the phenomenon of failure: the phenomenon of network artifacts appear, the beginning of the mesh artifacts only occasionally, or a sequence of one or two, after re-scanning mesh artifacts will generally disappear, but after a period of time, all scanned images There are strong mesh artifacts, artifacts still appear after re-sweep. Second, the failure analysis: MR artifacts are many factors, according to the cause of artifacts, the general is divided into artifact artifacts, motion artifacts and