Aortic dimensions by multi-detector computed tomography vs. echocardiography.
OBJECTIVE
Clinical follow-up of aortic dimensions is performed interchangeably by multi-detector computed tomography (MDCT) and by cardiac echocardiography (ECHO). This study assesses the relationship between measurements of the aortic diameter by MDCT and ECHO at various predetermined locations using several methods.


METHODS
The aortic diameter was measured at 6 locations between the aortic annulus and the aortic arch in 49 patients who underwent both MDCT and ECHO. Measurements were performed by three methods: internal-to-internal edge (INT), external-to-internal edge (MIX), and external-to-external edge (EXT). Measurements by MDCT and ECHO were made by an experienced radiologist and cardiologist, respectively, both blinded to results and images from the other modality.


RESULTS
The average aortic diameter at all locations was significantly different between the MDCT and ECHO by all three methods (INT: 30.0±5.8mm vs. 27.8±5.9mm; MIX: 31.5±5.8mm vs. 30.8±5.8mm; EXT: 32.9±6.6mm vs. 33.8±6.5mm, p<0.002 for all). While mean absolute differences between INT and EXT methods were similar (3.5±3.1mm and 3.4±2.7mm, respectively), the absolute difference using the MIX method was significantly smaller (3.1±2.8mm; p<0.001 for INT vs. MIX; p<0.05 for EXT vs. MIX).


CONCLUSIONS
There is considerable variability between MDCT and ECHO measurements of the ascending aorta. Measuring the aortic diameter by the MIX provides the closest measurements and is advised for long-term follow-up.
Noninvasive Cardiology Unit, Hillel Yaffe Medical Center, Hadera, Israel(1).
David S
DS
Blondheim
Department of Cardiology, Hillel Yaffe Medical Center, Hadera, Israel(1).
Lubov
L
Vassilenko
Department of Radiology, Hillel Yaffe Medical Center, Hadera, Israel(1).
Yair
Y
Glick
Noninvasive Cardiology Unit, Hillel Yaffe Medical Center, Hadera, Israel(1).
Aya
A
Asif
Department of Radiology, Hillel Yaffe Medical Center, Hadera, Israel(1).
Alicia
A
Nachtigal
Department of Cardiology, Hillel Yaffe Medical Center, Hadera, Israel(1).
Simcha R
SR
Meisel
Department of Cardiology, Hillel Yaffe Medical Center, Hadera, Israel(1).
Michael
M
Shochat
Department of Cardiology, Hillel Yaffe Medical Center, Hadera, Israel(1).
Avraham
A
Shotan
Department of Radiology, Hillel Yaffe Medical Center, Hadera, Israel(1). Electronic address: raufzeina3@hotmail.com.
Abdel-Rauf
AR
Zeina
D000368:Aged; D001011:Aorta / Q000000981:diagnostic imaging*; D001021:Aortic Valve / Q000000981:diagnostic imaging; D001024:Aortic Valve Stenosis / Q000000981:diagnostic imaging; D001027:Aortography / Q000379:methods*; D001837:Body Weights and Measures / Q000379:methods*; D004452:Echocardiography / Q000379:methods*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D061330:Multidetector Computed Tomography / Q000379:methods*; D015203:Reproducibility of Results
Aorta; Aortic diameter; Dimension; Echocardiography; Multi-detector computed tomography