Lung Density Measurement in Fontan Patients Using Zero Echo Time Sequences. - Callegari, Alessia; Zeimpekis, Konstantinos; Burkhardt, Barbara E. U.; Buechel, Emanuela R. Valsangiacomo; Callaghan, Fraser M.; Usemann, Jakob; Hersberger, Martin; Kellenberger, Christian J.; Geiger, Julia (Pediatric Cardiology, 2026)