拉链伪影Zipper artifact

Zipper artifacts are a type of MRI artifact where one or more spurious bands of electronic noise extends across the image. There are various causes for zipper artifacts in images and no single solution exists.
拉链伪影是一种MRI伪影，表现为一个或多个杂散电子噪声带延伸到图像中。出现拉链伪影的原因有很多，不存在单一的解决方案。这些伪影可能与扫描仪本身或屏蔽的硬件或软件问题有关。一个常见的原因是杂散射频信号污染了接收到的成像数据。在本例中，看到伪影的方向取决于编码频率的方向，并且将与频率编码方向成直角。结果是整个图像上与该频率相对应的异常黑白信号带。如果信号只有一个频率，则只会出现一个频段。如果有多个频率，则将存在多个频段。其他设备和软件问题可能会在任一轴上导致类似的类似拉链的伪影。
The zipper artifacts that can be controlled easily are those that occur when the door is open during the acquisition of images due to RF entering the scanning room from electronic equipment (e.g. mobile devices or aircraft) and are being picked by the receiver chain of imaging sub-systems.
故障排除：确保MR扫描仪室门在成像过程中关闭，成像前从患者身上取下所有电子设备。如果尽管附近的所有电子设备都已关闭，但伪影仍然存在，则射频屏蔽可能会有漏洞。通常发生在门和卡齿之间的触点处，可能需要清洁或修理。电缆进入房间的穿透板是另一个需要检查的部位。

磁共振伪影分析 , 3