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次级肺小叶(Secondary pulmonar lobule)又称肺小叶(pulmonary lobule),是由每一个细支气管(或3～5个终末细支气管)连同它的各级分支及其末端的肺泡所构浅的肺的结构和功能单位。CT应用于临床之前,放射学家通常是按照肺叶、肺段和肺亚段的概念来理解肺的解剖,很少考虑到次级肺小叶的放射学意义。近年随着高分辨CT(highresolution CT,HRCT)技术的运用,显著提高了肺部解剖细节的显示率,在肺弥漫性间质性疾病诊断中的作用日益受到重视。HRCT可以显示次级肺小叶的形态特征,而多数肺弥漫性间质性疾病可导致次级肺小叶形态的特征性改变,故掌握次级肺小叶的HRCT表现,是正确诊断肺弥漫性间质性病变的前提和基础。
Secondary Pulmonar lobule, also known as pulmonary lobule, is made shallow by the alveoli of each bronchiole (or 3-5 terminal bronchioles), along with its branches and distal ends Structure and function of lung units. Radiologists often interpret the anatomy of the lungs according to the concept of lobes, lung segments, and lung subsegments, rarely considering the radiological significance of secondary lung lobes, before CT was applied to the clinic. In recent years, with the application of high-resolution CT (HRCT) technology, the display rate of pulmonary anatomic details has been significantly improved, and the role of HRCT in the diagnosis of diffuse interstitial lung diseases has been paid more and more attention. HRCT can show the morphological characteristics of the secondary lung lobes, and most of the diffuse interstitial lung disease can lead to secondary lung lobular morphology changes, so to master the secondary pulmonary lobular HRCT performance is the correct diagnosis of diffuse pulmonary interstitial The premise and basis of the disease.