Susceptibility Artifacts Susceptibility Artifacts Susceptibility artifacts occur as the result of microscopic gradients or variations in the magnetic field strength that occurs near the interfaces of substance of different magnetic susceptibility. These gradients cause dephasing of spins and frequency shifts of the surrounding tissues. The net result are bright and dark areas with spatial distortion of surrounding anatomy. These artifacts are worst with long echo times and with gradient echo sequences. Clicking the icon will show an axial MRI of the head in a patient with mascara on her eyelids.
Susceptibility artifacts from the mascara obscure the front half of the globes.