2018 The Author(s). This article has been accepted for publication in Heart following peer review. The definitive copyedited, typeset version: Ghonim S, Jenkins S, Smith GC, et al 9 ECV and T1 mapping in repaired tetralogy of fallot – CMR diffuse fibrosis measurement needs the right method for the right ventricle? Heart 2018;104:A9, is available online at: http://dx.doi.org/10.1136/heartjnl-2018-BCVI.24