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53). However, both modalities systematically underestimated LAVmax largely compared to CMR (2D vs. CMR - 54.9 ± 21.3 mL; 4D vs. CMR - 49.7 ± 18.6 mL). Similar observations were made for minimal LA volume and LA volume before atrial contraction. Analyses time by 4D was shorter than for 2D (90 ± 11 vs. 118 ± 16 s, p less then 0.001). Intra- and interobserver variability was lower for 4D than 2D. Four-dimensional echocardiography is faster, more reproducible, and correlates more closely to CMR than 2D echocardiography. Both 4D and 2D echoc
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