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核磁共振成像

共振. 共振 (resonance) :共振是指一个物理系统在其自然的振动频率 ( 所谓的共振频率 ) 下趋于从周围环境吸收更多能量的趋势。自然中有许多地方有共振的现象。人类也在其技术中利用或者试图避免共振现象。. 核磁共振成像.

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核磁共振成像

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  1. 共振 共振(resonance):共振是指一个物理系统在其自然的振动频率(所谓的共振频率)下趋于从周围环境吸收更多能量的趋势。自然中有许多地方有共振的现象。人类也在其技术中利用或者试图避免共振现象。

  2. 核磁共振成像 核磁共振成像(Nuclear Magnetic Resonance Imaging‎,简称NMRI‎),又称自旋成像(spin imaging‎),也称磁共振成像(Magnetic Resonance Imaging‎,简称MRI‎),台湾又称磁振造影,是利用核磁共振(nuclear magnetic resonnance‎,简称NMR‎)原理,依据所释放的能量在物质内部不同结构环境中不同的衰减,通过外加梯度磁场检测所发射出的电磁波,即可得知构成这一物体原子核的位置和种类,据此可以绘制成物体内部的结构图像。 将这种技术用于人体内部结构的成像,就产生出一种革命性的医学诊断工具。快速变化的梯度磁场的应用,大大加快了核磁共振成像的速度,使该技术在临床诊断、科学研究的应用成为现实,极大地推动了医学、神经生理学和认知神经科学的迅速发展。

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