Key: Level A = 1 cm below aortic arch Level B = 1 cm cranial to aortic root Level C = 1 cm cranial to dome of right hemidiaphragm A1 = (0.72 x age) + 11.55 mm A2 = (0.629 x age) + 9.54 mm B1 = (0.668 x age) + 13 mm B2 = (0.572 x age) + 9.56 mm C   = (0.559 x age) + 8.44 mm

 
 

 

Level A

Above regression charts plot mean with 95% confidence limits.

Reference:  Fitzgerald SW, Donaldson JS, Poznanski AK.  Pediatric thoracic aorta:  Normal measurements determined with CT.  Radiology 1987; 165:667-669  (Used with permission from author:  awaiting permission from publisher)