Kormano M, Yrjänä J
Diagn Imaging. 1979;48(3):161-6.
The appearance and variations of the posterior tracheal band (PTB) was studied from 406 upright chest radiographs, taken from 293 individuals of varying age. PTB is visualized in about 80% of individuals well enough to be diagnostically useful. Its average width is 3 mm, and patient positioning can cause variations not exceeding 2 mm. Progressive widening by 2 mm or more, blurring of previously sharp margins or an overall width exceeding 5 mm should be considered suggestive of mediastinal or related abnormality.
对293名不同年龄个体的406张立位胸部X光片进行研究，观察气管后带（PTB）的形态及变异情况。约80%个体的PTB显示清晰，具有诊断价值。其平均宽度为3毫米，患者体位变化导致的宽度差异不超过2毫米。若PTB宽度逐渐增宽2毫米及以上、先前清晰的边缘模糊或总宽度超过5毫米，则应考虑存在纵隔或相关异常。
