Expiratory high-resolution CT scan

摘要: High-resolution CT (HRCT) is invaluable in the diagnosis and management of patients with diffuse lung disease, providing anatomic detail comparable gross pathology. Although HRCT has proved most useful infiltrative diseases, its application to airway obstructive diseases recently been emphasized. 68 , 102 Expiratory techniques as an adjunct inspiratory are particularly assessing physiologic information regard regional function. In morphologic abnormalities visible on scans can be subtle or nonspecific some patients. obtained during forced exhalation (dynamic expiratory CT), 93 103 suspended respiration after (postexpiratory at a user-selected respiratory level controlled using spirometer (spirometrically triggered CT) 41 42 49 have all shown characterized by airflow limitation air-trapping. Focal, multifocal, air-trapping these postexpiratory areas abnormally low attenuation confirm presence physiology scans, allow normal help distinguishing between disease cause inhomogeneous opacity seen scans. Air-trapping recognized various such emphysema, 44 46 asthma, 74 constrictive bronchiolitis (CB), 6 26 60 64 76 97 bronchiectasis. 36