The biplane area-length method is routinely used in clinical settings for left atrial volume (LAV) estimation. This technique is time-resolved but relies on geometrical assumptions of an ellipsoidal shape to estimate the LAV. In contrast, quantification derived from 3D segmentations on late gadolinium-enhanced magnetic resonance imaging and contrast-enhanced magnetic resonance angiography are static but do not rely on geometric assumptions. We compared the LAV estimation from these 3 methods in patients with atrial fibrillation and found a significant underestimation by the biplane area-length technique, indicating that this method may not capture the entire LAV in patients with complex anatomy.
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