Computed tomography (CT)-derived extracellular volume fraction (ECV) quantifies myocardial fibrosis noninvasively, comparable to cardiovascular magnetic resonance. The conventional subtraction method (ECV-conv) requires dedicated pre- and post-contrast acquisitions, while the dual-energy spectral method (ECV-spec) uses only the post-contrast phase. We aimed to compare these methods in patients undergoing CT planning for transcatheter aortic valve replacement (TAVR).