Fig. 3From: Improved catheter tracking during cardiovascular magnetic resonance-guided cardiac catheterization using overlay visualizationiSuite platform with the proposed T1-overlay approach during a Fontan fenestration test occlusion (FFTO). Two distinct gadolinium filled catheter tips shown in three orientations. One gadolinium filled balloon wedge catheter is shown closing the fenestration (orange arrow) while the other (shown in the Fontan conduit) is free to measure pressures and blood oxygen saturation during FFTOBack to article page