Aortic Size Assessment by Noncontrast Cardiac Computed Tomography: Normal Limits by Age, Gender, and Body Surface Area
Arik Wolak, MD*,
Heidi Gransar, MS*,
Louise E.J. Thomson, MB ChB*,
John D. Friedman, MD, FACC*,
Rory Hachamovitch, MD, FACC*,
Ariel Gutstein, MD*,
Leslee J. Shaw, PhD, FACC*,
Donna Polk, MD, MPH*,
Nathan D. Wong, PhD ,
Rola Saouaf, MD*,
Sean W. Hayes, MD*,
Alan Rozanski, MD, FACC*,
Piotr J. Slomka, PhD*,
Guido Germano, PhD, FACC*,
Daniel S. Berman, MD, FACC*,*
* Departments of Imaging (Division of Nuclear Medicine), Department of Medicine (Division of Cardiology), and CSMC Burns & Allen Research Institute, Cedars-Sinai Medical Center, and the Department of Medicine, University of California at Los Angeles, School of Medicine, Los Angeles, California
Heart Disease Prevention Program, Division of Cardiology, University of California, Irvine, California.
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Figure 1 Thoracic Aorta Measurements
Transaxial slice at the lower level of the pulmonary artery bifurcation from a computed tomography coronary artery calcium scan in a patient with normal aortic dimensions showing the method for deriving the ascending and descending aortic dimensions. For interpretation, the images were transferred to a dedicated workstation (NetraMD, ScImage, Los Altos, California). The white arrows represent outer wall thoracic ascending aortic diameter and thoracic descending aortic diameter measurements perpendicular to the axis of rotation of the aorta.
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Figure 2 Predicted Ascending and Descending Thoracic Aortic Diameter by Gender, Age, and BSA
(A) Nomogram of normal value of thoracic ascending aorta—female patients. (B) Nomogram of normal value of thoracic ascending aorta—male patients. (C) Nomogram of normal value of thoracic descending aorta—female patients. (D) Nomogram of normal value of thoracic descending aorta—male patients. The gold lines represent the estimated mean thoracic ascending aorta diameter. The orange lines represent the estimated 95% normal confidence upper and lower limits. BSA = body surface area; y/o = years of age.
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