FIG 8.

ARIA-H interpretation pitfalls. A, Motion and partial volume effects (right) result in poor visualization of a previously documented right frontal microhemorrhage (left, red arrow). B, Vessel in profile mimics a microhemorrhage on a single section (left, red arrow) but can be traced as a vessel flow void on adjacent slices (right, arrow). C, Deep gray mineralization is often confluent and ill-defined (left) and may be clearly differentiated from a microhemorrhage. However, when punctate, senescent mineralization may mimic a microhemorrhage (right, arrow). D, Bulk susceptibility effects preclude evaluation of the inferior temporal lobes adjacent to the mastoids and sinuses (arrows). E, Susceptibility artifacts may appear as punctate foci (arrows) adjacent to obvious susceptibility areas. Therefore, punctate foci of susceptibly in these regions should be interpreted with caution and in correlation with prior examinations. F, Phase artifacts, especially about the torcula (red arrows), can mimic microhemorrhages/siderosis and may be differentiated by recognition of the shape of the torcula repeating in the phase direction. Images courtesy of Biogen.