The following table or figure may be downloaded to PowerPoint for personal use in teaching and presentations. This feature is available to all subscribers to the journal.

You MUST read and follow the guidelines at Request to Reproduce AJR Content if you are distributing or using AJR content beyond academic use (limited distribution, non-revenue producing, or educational purposes).

(Downloading may take up to 30 seconds.
If the slide opens in your browser, select File -> Save As to save it.)
Click on image to view larger version.

Fig. 1A. —51-year-old man with emphysema. Ten-millimeter-thick CT images with 0.61-mm pixel dimensions obtained 3 months after lung volume reduction surgery were used to determine superior and inferior aspects of intrathoracic trachea. CT image depicts lateral aspect of right first rib, which was identified as superior aspect of intrathoracic trachea. Air column of trachea is outlined, and sagittal and coronal dimensions are illustrated as crosshairs within trachea. Tracheal parameters were sagittal dimension, 21.20 mm; coronal dimension, 18.81 mm; tracheal index, 0.89; circularity index, 0.95; and area, 340.56 mm².