Examples of stress T1 imaging. Cardiovascular magnetic resonance images show examples of AS pre and post AVR, and normal (from top to bottom panels). From left to right, examples of AV cine, stress T1 (with ΔT1 values between rest and stress), and stress perfusion imaging (with MPRI values). White arrows show circumferential perfusion defect in AS pre AVR which is not seen in post AVR or normal. AS = aortic stenosis; AVR = aortic valve replacement; AV = aortic valve; ΔT1 = change in T1; MPRI = myocardial perfusion reserve index.