X-ray computed tomography (Axial)
|Haller's index is calculated using the ratio between maximal thoracic transverse diameter divided by maximal thoracic anteroposterior diameter. In pectus excavatum, the index is > 3.25.|
Haller JA, Kramer SS, Lietman SA. Use of CT scans in selection of patients for pectus excavatum surgery: a preliminary report. J. Pediatr. Surg. 1987;22 (10): 904-6.