Monoi H
Biophys J. 1974 Sep;14(9):653-9. doi: 10.1016/S0006-3495(74)85942-4.
The theoretical line-shape function of the nuclear magnetic resonance (NMR) signal of (23)Na in biological tissue (and other unoriented systems) was obtained under the following conditions: (I) there occur two states of (23)Na in the system, (II) the exchange of (23)Na between the two states is rapid (but not too rapid), (III) in the absence of exchange, the (23)Na in one state is characterized by a single transverse relaxation time T(2) and a single Larmor frequency, and (IV) in the absence of exchange, the (23)Na in the other state possesses (a) two different values of T(2) and/or (b) more than one Larmor frequencies in the first order perturbation effect. The theoretical signal obtained consists of two Lorentzian components, which are centered at the same frequency, but characterized by different T(2). Only the narrower component, comprising 40% of the total intensity, is visible, when the fast T(2) is sufficiently short. The theoretical line-shape function of (23)Na signal was also calculated for oriented systems in which the above conditions are fulfilled.
在以下条件下得出了生物组织（以及其他非定向体系）中(23)Na核磁共振（NMR）信号的理论线形函数：（I）体系中存在(23)Na的两种状态；（II）两种状态之间的(23)Na交换很快（但不是太快）；（III）在不存在交换的情况下，一种状态下的(23)Na具有单一横向弛豫时间T(2)和单一拉莫尔频率；（IV）在不存在交换的情况下，另一种状态下的(23)Na在一级微扰效应中具有（a）两个不同的T(2)值和/或（b）不止一个拉莫尔频率。所得到的理论信号由两个洛伦兹分量组成，它们以相同频率为中心，但具有不同的T(2)。当快速T(2)足够短时，只有占总强度40%的较窄分量可见。还针对满足上述条件的定向体系计算了(23)Na信号的理论线形函数。
