Fig. 1

Cardiovascular magnetic resonance (CMR) example of different measurements used in our study. a Branch pulmonary artery (PA) flow measurement. b Branch PA cross-sectional area was calculated by measuring two orthogonal dimensions at the narrowest segment. c Left pulmonary artery (LPA) compression by a dilated ascending aorta. d Lung volume calculation by Simpson’s method using manual tracing in each slice on an axial image balanced steady-state free precession stack