Measurement of Tracheobronchial Tree Using 3D CT

Anatomical variations of right main bronchus have been discouraged anesthesiologists' use of right-sided double lumen tubes to facilitate one-lung anesthesia. However, there are absolute indications of right-sided DLTs surgically, such as left pneumonectomy or in cases with left main endobronchial lesions. With recent advances of 3-dimensional spiral CT reconstruction technique, the investigators conducted this retrospective study to measure accurate length of right and left main bronchus and the angle between the center of the right main bronchus and right upper lobe orifice in axial image to help choosing and further manufacturing right-sided double-lumen tubes.