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Abstract #4503

Virtual Short Axis: A Novel Method for Computing Left Atrial Volumes from Two and Four Chamber MRI

Nikhil Jha1, 2, Chun Schiros3, Nouha Salibi4, Himanshu Gupta3, Steven Lloyd3, Louis J. Dell'Italia5, Thomas Stewart Denney1, 2

1AU MRI Research Center, Auburn University, Auburn, AL, United States; 2Electrical and Computer Engineering, Auburn University, Auburn, AL, United States; 3Division of Cardiology, University of Alabama Birmingham, Birmingham, AL, United States; 4MR R&D, Siemens Healthcare, Malvern, PA, United States; 5Division of Cardiology, University of Alabama at Birmingham, Birmingham, AL, United States

Quantification of left atrial (LA) volumes throughout the cardiac cycle is important to assess atrio-ventricular coupling. The area-length method is based on areas and lengths of the atrium in four chamber and two chamber views, but does not account for differences in LA shape. The serial short-axis method is more accurate, but requires acquisition of additional short-axis slices. We present and validate a new method for computing LA volumes from standard four and two chamber views, which computes virtual short-axis LA contours based on four and two chamber contours and sums the virtual slice volumes to compute a total volume.