Webb W R
Department of Radiology, University of California, San Francisco.
Radiol Clin North Am. 1994 Jul;32(4):745-57.
High-resolution CT (HRCT) scanning and dynamic CT techniques have significantly improved our ability to image morphologic abnormalities associated with chronic airflow obstruction. Abnormalities visible on HRCT include emphysema, lung cysts, and large airways abnormalities, such as bronchiectasis, which are accurately assessed using this technique. Also visible are small airways abnormalities, such as bronchiolar dilation and filling of bronchioles with mucus or fluid. Perfusion abnormalities resulting from abnormal lung ventilation result in regional differences in lung attenuation, so-called mosaic perfusion. Expiratory HRCT scans or dynamic scans during expiration can show areas of air trapping.
高分辨率CT（HRCT）扫描和动态CT技术显著提高了我们对与慢性气流阻塞相关形态学异常进行成像的能力。HRCT上可见的异常包括肺气肿、肺囊肿以及大气道异常，如支气管扩张，使用该技术可对其进行准确评估。小气道异常也可见，如细支气管扩张以及细支气管内黏液或液体充盈。肺通气异常导致的灌注异常会引起肺衰减的区域差异，即所谓的马赛克灌注。呼气期HRCT扫描或呼气时的动态扫描可显示空气潴留区域。
