Magnetic Resonance Imaging Scanner

磁共振成像（MRI）是临床医学中最灵活、最强大的非侵入性诊断成像技术。MRI作为一种很大程度上定性的工具是公认的。作为一种非侵入性方法，MRI主要用于通过绘制氢（水）的空间位置来可视化生物系统的内部结构。磁共振信号寿命和分子扩散通常定性地体现在磁共振图像对比中。这些参数的定量分析将揭示分子尺度信息，因为磁共振对一系列物理/化学特征很敏感，包括分子结构、运动、大小和相互作用，通过测量信号寿命和分子扩散。定量磁共振成像的潜力已得到认可。但是，要充分发挥这一潜力，仍然需要在方法上取得重大进展。

Magnetic resonance imaging (MRI) is the most flexible and powerful non-invasive diagnostic imaging technique available to clinical medicine. MRI as a largely qualitative tool is well established. As a non-invasive method, MRI is principally used to visualize the internal structure of biological systems through mapping the spatial position of hydrogen (water). The magnetic resonance signal lifetimes and molecular diffusion usually manifest qualitatively in the MR image contrast. Quantitative analysis of these parameters will reveal molecular scale information, since magnetic resonance is sensitive to a range of physical/chemical characteristics including molecular structure, motion, size and interactions, through the measurements of signal lifetime and molecular diffusion. The potential for quantitative MR has been recognized. However, significant methodological developments are still required for this potential to be fully realized.