Preserved ratio impaired spirometry (PRISm) is a common pulmonary functional impairment, considered a pre-chronic obstructive pulmonary disease stage and has received increased attention from the academic community in recent years. Despite a comprehensive review of the etiology, epidemiology, and risk factors of the PRISm population, there is a lack of systematic review for chest CT imaging. To gain a more comprehensive understanding of this population, this article summarizes the chest CT imaging features of the PRISm population using both visual and quantitative assessment methods, including the characteristic changes of airways, lung parenchyma, and vessels. The article indicates that the reference value of visual assessment of chest CT results for the PRISm population is limited, while quantitative assessment of chest CT, combined with pulmonary function testing, is advantageous in gaining a deeper understanding of the lung structural features of the PRISm population. Future studies are expected to employ a more systematic approach through prospective, large-sample, multi-center cohort studies to elucidate the characteristics of the PRISm population in chest imaging.

保留比值受损肺功能（PRISm）是一种常见的肺功能障碍，其被认为是慢性阻塞性肺疾病前期阶段，近年来颇受学术界的关注。尽管目前已有研究者对PRISm群体病因、流行病学、危险因素等方面进行了综述，但是有关胸部CT影像学的检查尚缺乏较为全面的综述。为了更加深入且全面地了解这一人群，本文对PRISm人群胸部CT影像学特征进行总结，评估方法包括视觉评估及定量评估，评估内容包括气道、肺实质及血管的特征变化。本文表明PRISm人群单纯根据胸部CT视觉评估得到的CT影像学特征的参考价值有限，胸部CT的定量评估及其联合肺功能检查指标有利于深入了解PRISm人群的肺部结构特征，并建议在未来开展更多的系统性研究，如前瞻性、大样本、多中心队列研究，以阐述PRISm人群的胸部影像学特征。