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Extracellular Volume Fraction (ECV%) Calculator
: Explanation and Clinical Context Extracellular Volume Fraction (ECV%) quantifies the proportion of myocardial tissue that is extracellular space, as derived from pre- and post-contrast T1 mapping in cardiac magnetic resonance imaging (CMR). It reflects interstitial expansion caused by fibrosis, edema, or infiltration. The ECV is calculated using native and post-contrast myocardial and blood T1 values, adjusted for