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磁共振成像(MRI)

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ID: ANH16182chis
医学动画文字记录:磁共振成像,通常称为MRI,可以帮助医生发现、观察和治疗疾病。MRI使用非常强的磁体、无线电波和计算机来生成人体内部的图像。MRI比其他方法拍摄的图像更精细。进行MRI检查的原因有很多。MRI可能会发现出血,比如脑部出血;卒中时大脑的病变;背部问题,如椎间盘突出;还有身体内部的损伤,如前交叉韧带撕裂。在做MRI之前,请去除所有金属物体。而且身体内有医用植入物做MRI也是不安全的。你应该告知MRI技术人员你体内的任何金属设备或植入物,比如起搏器。为了进行MRI检查,你需要躺在扫描仪外面的一张桌子上。MRI扫描仪噪声很大,所以你可能需要戴耳塞或耳机。不同的用具,比如枕头和背带,可以帮助你保持正确的姿势。一旦你准备好了,桌子就会滑进扫描仪。大多数情况下,使用的是封闭的扫描仪,比如像这样。里面的空间很窄。在一些地区,也可以用开放的扫描仪。这种扫描仪侧面是打开的,所以你不会完全被机器包围。然而,图像效果可能不如封闭的扫描仪好。对于任何一种类型的扫描仪,技术人员都在隔壁房间进行操作。你们将能够通过对讲机进行交谈。在扫描过程中,机器中的磁体会产生一个很强的磁场,这不会对你产生伤害。然后扫描仪会向你的身体发送无线电波,也不会对你产生伤害。当无线电波关闭时,扫描仪就会从你的身体接收到能量信号。这些信号用来生成图像。在扫描过程中,你必须保持静止,这样图像才会清晰。你可能会被要求屏住呼吸一段时间。MRI检查可能需要30~45分钟甚至更长时间才能完成。在某些情况下,需要使用造影剂。造影剂有助于使图像更加清晰。MRI检查结束后,你就可以恢复正常活动了。如果你使用了造影剂,技术人员可能会要求你喝大量的水或其他健康饮料,以帮助肾脏排出造影剂。

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