Fig. 5

a Sagittal volume rendered 3D image in a patient with concentric LV thickening shows severe coarctation of the aortic arch (straight arrow) and multiple collateral vessels(curved arrows). b Velocity encoded phase contrast image in the sagittal plane in another patient shows flow acceleration through the aortic arch at the site of coarctation, which was quantified and the pressure gradient was estimated to be 20 mm Hg