High-resolution computed tomography of obstructive lung disease.
Webb WR
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.
