Published Online
on August 7, 2006

A more recent version of this article appeared on August 15, 2006

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Submitted on March 9, 2006
Revised on June 13, 2006
Accepted on June 14, 2006

Quantitative Assessment of Left Ventricular Size and Function. Side-by-Side Comparison of Real-Time Three-Dimensional Echocardiography and Computed Tomography With Magnetic Resonance Reference

Lissa Sugeng MD^*, Victor Mor-Avi PhD, Lynn Weinert BS, Johannes Niel MD, Christian Ebner MD, Regina Steringer-Mascherbauer MD, Frank Schmidt MS, Christian Galuschky MS, Georg Schummers MS, Roberto M. Lang MD, and Hans-Joachim Nesser MD

From the University of Chicago, Chicago, Ill (L.S., V.M.-A., L.W., R.M.L.); Public Hospital Elisabethinen, Linz, Austria (J.N., C.E., R.S.-M., H.-J.N.); and TomTec, Unterschleisheim, Germany (F.S., C.G., G.S.).

^* To whom correspondence should be addressed. E-mail: lsugeng{at}medicine.bsd.uchicago.edu.

Background--Cardiac CT (CCT) and real-time 3D echocardiography (RT3DE) are being used increasingly in clinical cardiology. CCT offers superb spatial and contrast resolution, resulting in excellent endocardial definition. RT3DE has the advantages of low cost, portability, and live 3D imaging without offline reconstruction. We sought to compare both CCT and RT3DE measurements of left ventricular size and function with the standard reference technique, cardiac MR (CMR).

Methods and Results--In 31 patients, RT3DE data sets (Philips 7500) and long-axis CMR (Siemens, 1.5 T) and CCT (Toshiba, 16-slice MDCT) images were obtained on the same day without -blockers. All images were analyzed to obtain end-systolic and end-diastolic volumes and ejection fractions using the same rotational analysis to eliminate possible analysis-related differences. Intertechnique agreement was tested through linear regression and Bland-Altman analyses. Repeated measurements were performed to determine intraobserver and interobserver variability. Both CCT and RT3DE measurements resulted in high correlation (r²>0.85) compared with CMR. However, CCT significantly overestimated end-diastolic and end-systolic volumes (26 and 19 mL; P<0.05), resulting in a small but significant bias in ejection fraction (-2.8%). RT3DE underestimated end-diastolic and end-systolic volumes only slightly (5 and 6 mL), with no significant bias in EF (0.3%; P=0.68). The limits of agreement with CMR were comparable for the 2 techniques. The variability in the CCT measurements was roughly half of that in either RT3DE or CMR values.

Conclusions--CCT provides highly reproducible measurements of left ventricular volumes, which are significantly larger than CMR values. RT3DE measurements compared more favorably with the CMR reference, albeit with higher variability.

Key words: imaging • echocardiography • magnetic resonance imaging • tomography

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