Functional MRI (second edition) -- 4. Basic Principles of MR Image Formation
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Bloch Equation
可以分解为三个标量方程:
求解4得到
求解2、3的解为
写成
磁场不是均匀稳定磁场而是
由于
得到
接收到的MR信号为
————————————————————————————————————-
Slice Selection
一层中的
由于已经选取了一层,所以在2D下的信号
———————————————————————————————-
k-space
定义:
所以
因此S(t)与k之间的关系是2-D傅里叶变换。
Field of view:
voxel size:
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