In conclusion, RV ECV can be assessed if image quality allows sufficient distinction between myocardium and blood, and RV wall thickness per ROI is ≥ 1 pixel. ECV from ROIs and corresponding LOIs correlated strongly in both directions (SAX/TRANS: r = 0.97/0.87, p < 0.001, respectively). RV myocardium tended to be more clearly delineated in SAX than TRANS. RV ECV was not quantifiable in 4/39 patients due to insufficient contrast or wall thickness < 1 pixel. In CHD, average image quality was good (no artifacts in the RV, good contrast between blood/myocardium), and RV wall thickness was 1–2 pixels.

ECV from plane ROIs was compared with values obtained with a custom-made tool that derives the mean T1 values from a “line of interest” (LOI) centered in the RV wall. Regions of interest (ROIs) were evaluated with regard to image quality and maximum RV wall thickness per ROI in pixels. Patients (n = 39) and healthy controls (n = 17) underwent cardiovascular magnetic resonance T1 mapping in midventricular short axis (SAX) and transverse orientation (TRANS). We aimed to assess the feasibility of RV ECV measurements in congenital heart disease (CHD), and to introduce a novel ECV analysis tool. The right ventricle´s (RV) characteristics-thin walls and trabeculation-make it challenging to evaluate extracellular volume (ECV).

Osirix lite length tool shows 0 pixels