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磁共振成像解决方案——Ameya360电子元器件平台
Release time：2020-05-22
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source：Ameya360
reading：2057
1、前言
磁共振成像 (MRI) 是根据有磁距的原子核在磁场作用下，能产生能级间的跃迁的原理而采用的一项新检查技术，MRI 有助于检查癫痫患者脑的能量状态和脑血流情况，对变性病诊断价值很大。MRI 是通过体外高频磁场作用，由体内物质向周围环境辐射能量产生信号实现的，成像过程与图像重建和 CT 相近，只是 MRI 既不靠外界的辐射、吸收与反射，也不靠放射性物质在体内的γ辐射，而是利用外磁场和物体的相互作用来成像，高能磁场对人体无害。
2、方案概述
Ameya360 磁共振成像解决方案螺旋空间的方式是螺旋路径，它是通过线性增长的正弦共振梯度组成。 数据采集时采用恒定圆速度螺旋方式，也可采用矩形螺旋方式，
即通过幅度或延迟时间增长的梯度矩形脉冲来实现。由于读出梯度和相位编码梯度都是正弦波形， 因此对产生的回波进行频率编码时梯度场强不是固定不变的，这就要求以非线性方式采集数据，
并采用特殊的二维傅立叶转换重建算法。以圆形的螺旋轨迹覆盖 6 空间，抛开了对 6 空间 $ 个角落数据的采集，从而有效地减少甚至避免图像信号的衰减。因此，在实际应用中，可以根据需要改变螺旋线的数目，谋求成像的时间分辨率、空间分辨率和信噪比达到最佳的结合点，使所成图像具备良好的空间分辨率和信噪比，同时节省扫描时间。
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