Chasen M H
Department of Radiology, University of Texas M.D. Anderson Cancer Center, Box 57, 1515 Holcombe Blvd, Houston, TX 77030, USA.
Radiology. 2001 Jun;219(3):596-610. doi: 10.1148/radiology.219.3.r01jn37596.
In this review, routine radiographs with computed tomographic (CT) correlation are used to demonstrate practical applications of Mach band theory in thoracic analysis. Mach bands represent optical psychophysiologic edge-enhancement phenomena produced by means of lateral inhibition in the retina of the eye. Visualization of Mach bands depends on a set of variables that involve primarily the contour and optical density of a structure at an interface relative to that of its surround. On the basis of their appearance, the bands are defined as positive (white) or negative (black). The concept of Mach bands contributes to a greater understanding of three-dimensional structures projected onto two-dimensional routine radiographic images of the thorax. Mach bands can help differentiate normal from abnormal anatomy and thus increase the diagnostic yield from such images. Mach bands can be seen on images that use transmitted or reflective light, including CT scout images (topograms) of the thorax.
在本综述中，结合计算机断层扫描（CT）的常规X线片用于展示马赫带理论在胸部分析中的实际应用。马赫带是通过眼睛视网膜中的侧向抑制产生的光学心理生理边缘增强现象。马赫带的可视化取决于一组变量，这些变量主要涉及结构在界面处相对于其周围环境的轮廓和光学密度。根据其外观，这些带被定义为正（白色）或负（黑色）。马赫带的概念有助于更好地理解投射到胸部二维常规X线图像上的三维结构。马赫带有助于区分正常与异常解剖结构，从而提高此类图像的诊断率。在使用透射光或反射光的图像上可以看到马赫带，包括胸部的CT定位像（正位片）。
