Daffner R H
AJR Am J Roentgenol. 1977 Apr;128(4):607-12. doi: 10.2214/ajr.128.4.607.
Mach bands are an optical phenomenon in which dark and light lines appear at the borders of structures of different radiodensity on radiographs. In most instances they do not cause a diagnostic dilemma. However, in a patient who has sustained trauma to the cervical spine, the commonly occuring negative Mach band across the base of the dens may be mistaken for a fracture. Failure to recognize this optical illusion may result in unnecessary treatment by skeletal traction. The production of Mach bands, methods of proving their illusory nature, and several illustrative cases are presented.
马赫带是一种光学现象，在X光片上，不同放射密度结构的边界处会出现暗线和亮线。在大多数情况下，它们不会造成诊断上的困扰。然而，对于一名颈椎受到创伤的患者，齿状突基部常见的负性马赫带可能会被误诊为骨折。未能识别这种视错觉可能会导致不必要的骨骼牵引治疗。本文介绍了马赫带的产生、证明其虚幻性质的方法以及几个示例病例。
