Thoracic aorta diameters in Marfan patients: Intraindividual comparison of 3D modified relaxation-enhanced angiography without contrast and triggering (REACT) with transthoracic echocardiography

•TTE and modified REACT showed excellent interobserver reliability for measurements of the proximal thoracic aorta.•There was a strong correlation for all levels of measurement between TTE and modified REACT. At the SV and STJ there was no significant difference of measured diameters between both techniques whereas at the AoA, diameters were significantly larger using TTE.•Given the high agreement between both techniques, TTE and modified REACT can be used for surveillance of aortic diameters in MFS.