Source:Magnetic Resonance Imaging
Author(s): Susumu Tao, Luisa A. Ciuffo, Joao A.C. Lima, Katherine C. Wu, Hiroshi Ashikaga
PurposeLeft atrial (LA) structure and function are important markers of adverse cardiovascular outcomes. Tissue-tracking cardiovascular magnetic resonance (CMR) accurately quantifies LA volume, strain, and strain rate based on biplane long-axis imaging. We aimed to assess the accuracy of the LA indices quantification from single-plane tissue-tracking CMR.MethodsWe included 162 patients (mean age 56±15, male 70%) from a prospective cohort study whose cine CMR images in sinus rhythm were available in both four-chamber and two-chamber views. The group was divided into the training set (n=81) and the test set (n=81). In the training set, we compared the LA indices derived from biplane imaging and single-plane imaging (a four-chamber view), and developed regression equations. In the test set, we used the regression equations to estimate the LA indices from the single-plane imaging, and quantified the accuracy of the estimation against the LA indices from the biplane.ResultsIn the training set, all the LA indices from the single-plane imaging were systematically underestimated compared with those from the biplane imaging (p<0.05), however, the correlation coefficient was high (r2=0.70–0.93, p<0.001). In the test set, LA volumetric indices showed excellent reproducibility with relatively low variability (<20%); For LA strain and strain rate indices, reproducibility was excellent, however, the variability was slightly higher than that of volumetric indices.ConclusionsLA volumetric indices measured from single-plane tissue-tracking CMR are highly accurate and reproducible with reference to those derived from the standard biplane imaging. The reproducibility of LA strain and strain rate indices from single-plane tissue-tracking CMR is excellent but the variability is higher than that of the volumetric indices.
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