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ci gong zhen cheng xiang zhong de zao ying ji
Author(s): 
Pages: 68-69
Year: Issue:  Z1
Journal: Chinese Journal of Medical Physics

Keyword:  杂散磁场氢核造影剂磁共振成像弛豫时间固有磁矩旋进噪声频谱物理原理静磁场;
Abstract: <正> MR造影与X线造影的物理原理不同。MR造影剂只改变氢核系统的弛豫时间,造成相邻组织在弛豫时间上的差别,以达造影目的。一切顺磁质都可减少氢核系统的弛豫间。顺磁质原子的固有磁矩在静磁场B_o中即要绕B_o方向旋进,又要伴随分子作热运动,这就加剧了氢核周围业已存在的杂散磁场。这个杂散磁场瞬息万变,在其噪声频谱
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