Fig. 1
Automated calculation of the left atrial (LA) volume from long-axis CMR cines and 3D cines with Atri-U. The existing workflow enables the manual review of automated predictions at each individual step of the biplane area-length method (orange column). If revision is required the corrected predictions are used to recalculate maximum LA volume (LAVmax, where A2ch and A4ch are LA areas and L is the minimum of two longitudinal diameters). For the 3D cines, the steps of frame detection and landmark localization do not apply as the volume is calculated from the sum of atrial area on each slice times the slice thickness (see Additional file 1: Section E3). ES = end-systole, CMR = cardiovascular magnetic resonance