Bradley W G, Shelden C H
Am J Surg. 1983 Jul;146(1):85-7. doi: 10.1016/0002-9610(83)90264-7.
Nuclear magnetic resonance tomography is a powerful new imaging modality which produces cross-sectional images similar to those obtained by computerized tomography. However, unlike computerized tomography, nuclear magnetic resonance imaging does not use ionizing radiation but rather utilizes an apparently safe interaction between magnetic fields, radio waves, and atomic nuclei. Basic principles of nuclear magnetic resonance imaging are discussed briefly and promising early clinical applications are reviewed. The two magnetic relaxation times, T1 and T2, provide discrimination between tissues based on differences in fat and water content. Tumors are readily differentiated from normal tissue on the basis of the increased water content, primarily due to edema and hypervascularity. Although nuclear magnetic resonance imaging is very sensitive in the detection of these abnormalities, it is not yet able to provide a specific diagnosis.
核磁共振断层扫描是一种强大的新型成像方式，它所产生的横断面图像与计算机断层扫描获得的图像相似。然而，与计算机断层扫描不同的是，核磁共振成像不使用电离辐射，而是利用磁场、无线电波和原子核之间一种明显安全的相互作用。本文简要讨论了核磁共振成像的基本原理，并综述了早期有前景的临床应用。两个磁弛豫时间T1和T2，基于脂肪和水含量的差异来区分不同组织。肿瘤由于主要因水肿和血管增生导致含水量增加，因而很容易与正常组织区分开来。尽管核磁共振成像在检测这些异常情况时非常敏感，但它仍无法提供明确的诊断。
