Functional MRI (second edition) -- 3. Basic Principles of MR Signal Generation(II)
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公式解释:
Magnetci Moment
Angular Momentum
gyromagnetic ratio
ex: 以单个质子为例
torque
又根据定义
得到
带入8式得到
*求解9的过程:
At time 0,
解得:
————————————————————————————————–
high-energy state和low-energy state之间能量差
反转一个spin需要做功:
Bohr relation:
由1、2得到
实验经验数据:一个质子的
所以
4带入3得到:Larmor frequency
————————————————————————————————-
由1、2解得
所以net magnetization
解得:
————————————————————————————————-
Excitation
electromagnetic excitation pulse:
后面会使用旋转坐标系,旋转坐标系中的
在旋转坐标系下:
由前面我们知道:
由1、2、3可以推出
在on-resonance时,
所以
W与x’y’平面的角度
——————————————————————–
Signal reception
electromotive force:
由上两式可得:
信号强度与
———————————————————————
Relaxation
———————————————————————
Bloch Equation
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