CT Chest With IV Contrast There is no relevant literature to support the use of chest CT with IV contrast for initial evaluation of suspected tracheomalacia or bronchomalacia. CT Chest Without and With IV Contrast There is no relevant literature to support the use of chest CT without and with IV contrast for initial evaluation of suspected tracheomalacia or bronchomalacia. CT Chest Without IV Contrast Chest CT without IV contrast is useful for noninvasive imaging of ECAC, including tracheobronchomalacia and excessive dynamic airway collapse. Chest CT during forced expiration has been widely adopted as the primary imaging protocol because it is more sensitive for detection of ECAC, eliciting greater degrees of expiratory collapse than CT obtained at end expiration [29-31]. In a study of 29 patients with suspected ECAC, forced expiratory dynamic cine imaging showed tracheal collapse >50% at 38% of assessed levels compared to 13% at end-expiratory CT [32]; a study of 67 patients with chronic obstructive pulmonary disease (COPD) showed a mean tracheal collapse of 62% at forced expiratory CT and only 17% at end expiratory CT [31]. Fifty percent area narrowing of the lumen of the trachea on CT at expiration had originally been considered suggestive of ECAC, but a threshold of 70% collapse is now proposed following a study by Boiselle et al [17], finding >50% collapse in 40 of 51 (78%) healthy volunteers. CT Neck and Chest With IV Contrast There is no relevant literature to support the use of neck and chest CT with IV contrast for initial evaluation of suspected tracheomalacia or bronchomalacia. CT Neck and Chest Without and With IV Contrast There is no relevant literature to support the use of neck and chest CT without and with IV contrast for initial evaluation of suspected tracheomalacia or bronchomalacia.
Tracheobronchial Disease. CT Chest With IV Contrast There is no relevant literature to support the use of chest CT with IV contrast for initial evaluation of suspected tracheomalacia or bronchomalacia. CT Chest Without and With IV Contrast There is no relevant literature to support the use of chest CT without and with IV contrast for initial evaluation of suspected tracheomalacia or bronchomalacia. CT Chest Without IV Contrast Chest CT without IV contrast is useful for noninvasive imaging of ECAC, including tracheobronchomalacia and excessive dynamic airway collapse. Chest CT during forced expiration has been widely adopted as the primary imaging protocol because it is more sensitive for detection of ECAC, eliciting greater degrees of expiratory collapse than CT obtained at end expiration [29-31]. In a study of 29 patients with suspected ECAC, forced expiratory dynamic cine imaging showed tracheal collapse >50% at 38% of assessed levels compared to 13% at end-expiratory CT [32]; a study of 67 patients with chronic obstructive pulmonary disease (COPD) showed a mean tracheal collapse of 62% at forced expiratory CT and only 17% at end expiratory CT [31]. Fifty percent area narrowing of the lumen of the trachea on CT at expiration had originally been considered suggestive of ECAC, but a threshold of 70% collapse is now proposed following a study by Boiselle et al [17], finding >50% collapse in 40 of 51 (78%) healthy volunteers. CT Neck and Chest With IV Contrast There is no relevant literature to support the use of neck and chest CT with IV contrast for initial evaluation of suspected tracheomalacia or bronchomalacia. CT Neck and Chest Without and With IV Contrast There is no relevant literature to support the use of neck and chest CT without and with IV contrast for initial evaluation of suspected tracheomalacia or bronchomalacia.