The conceptual approach consists in acquiring an MR image or spectrum for any pH-sensitive MR property of molecules non-permeable to the membrane. The chemical shift of a nucleus localized in, or in close proximity to, an ionizable group of a non-permeable molecule, is normally used as a "pH informative resonance" in the extracellular space. Several MR methods (CSIC - Chemical shift selective imaging, or SI - spectroscopic image) can be used to determine the spatial distribution of the "informative resonance", and thereby the extracellular pH distribution within the sample. This information is most useful in clinical conditions such as muscular dystrophy, isquemia, tumoral transformation and metastasis, among others.
概念方法包括获取非膜渗透分子的任何 pH 值敏感磁共振特性的磁共振图像或频谱。细胞核的
化学位移定位在非渗透性分子的可电离基团内或其附近,通常被用作细胞外空间的 "pH 值信息共振"。有几种核磁共振方法(CSIC -
化学位移选择性成像,或 SI - 光谱图像)可用于确定 "信息共振 "的空间分布,从而确定样本中细胞外 pH 值的分布。这种信息对肌肉萎缩症、异喹血症、肿瘤转化和转移等临床病症最为有用。