支气管扩张症 (以下简称支扩 )为支气管树的持久性异常扩张 ,是呼吸系统常见病之一。以往诊断支扩 ,主要是根据典型的临床症状、Ｘ线平片和支气管造影检查。随着现代诊断技术的进展 ,尤其是高分辨ＣＴ(ＲＨＣＴ)扫描技术的应用 ,使许多轻中度支扩 ,包括一些临床表现不典型和胸 Bronchiectasis (hereinafter referred to as branch expansion) is the persistent abnormal expansion of the bronchial tree, is one of the common respiratory diseases. In the past the diagnosis of expansion, mainly based on the typical clinical symptoms, X-ray and bronchography. With the development of modern diagnostic techniques, especially the application of high resolution CT (RHCT) scanning technology, many mild to moderate branching, including some atypical clinical manifestations and chest