<b>Atrial Imaging with MRI in ASD (AIM-ASD)</b>

This specific population is known to have high susceptibility to atrial remodelling and arrhythmogenesis, however detailed atrial imaging data for congenital heart disease cohorts remains scarce in existing public repositories.<br>The dataset includes CMR scans from 23 ASD patients and 17 comparison subjects with paroxysmal atrial fibrillation and structurally normal hearts.

All imaging was performed using a standardized protocol on a 1.5T MRI scanner, incorporating contrast-enhanced whole-heart MR angiography and 3D late gadolinium enhancement (LGE) imaging for assessment of atrial anatomy and fibrotic substrate. Each scan is accompanied by expert manual bi-atrial segmentations provided in NifTi format and surface meshes containing fibrosis map in VTK format.</p><p dir="ltr">This dataset supports research into atrial structural remodelling, fibrosis distribution, and the arrhythmogenic substrate in congenital versus acquired atrial cardiomyopathy.