弛缓 (核磁共振) Relaxation (NMR)
（重定向自Magnetic relaxation）
弛缓或译作弛豫，在核磁共振(NMR)现象学上，针对磁化强度的演化分成两个面向：
- 纵向弛缓：磁化强度M平行主磁场(B0，所指方向习惯定为正z方向)的分量——常标作z分量Mz——回复至热平衡值M0的过程。涉及到的时间常数为T1。
![M_z(t) = M_0 - e^{-t/T_1}\cdot [M_0-M_z(t=0)] \,](/uploads/202501/25/6097e99855d78c3c9f5d9a5d438b4fb80127.png)
- 横向弛缓：磁化强度M垂直主磁场的分量——常标作x-y平面分量Mxy，或横分量MT，或垂直分量
——衰减到零的过程。涉及到的时间常数为T2。
Magnetic relaxation
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英语百科
Relaxation (NMR) 弛缓 (核磁共振)
（重定向自Magnetic relaxation）
In nuclear magnetic resonance (NMR) spectroscopy and magnetic resonance imaging (MRI) the term relaxation describes how signals change with time. In general signals deteriorate with time, becoming weaker and broader. The deterioration reflects the fact that the NMR signal, which results from nuclear magnetization, arises from the over-population of an excited state. Relaxation is the conversion of this non-equilibrium population to a normal population. In other words, relaxation describes how quickly spins "forget" the direction in which they are oriented. The rates of this spin relaxation can be measured in both spectroscopy and imaging applications.
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