Figure 17From: Cardiovascular magnetic resonance physics for clinicians: part I'Proton density'-weighted spin echo. T1 and T2 relaxation curves for a 'proton density'-weighted spin echo pulse sequence (180° pulse not shown) for three different tissues. The long TR minimises differences due to differences in T1 relaxation, while the short TE minimises differences due to differences in T2 relaxation, leading to T2-based contrast. 'Proton density'-weighted images are characterised by high signal intensity from most tissues and low tissue contrast.Back to article page