Which sequence of MRI is used to detect microhemorrhages?: (A) T1WI, (B) T2WI, (C) SWI, (D) DWI
Answer is C. SWI (Susceptibility-Weighted Imaging ) is a relatively new full-velocity compensated high-resolution 3-dimensional gradient echo sequence that accurately detects small hemorrhage (microhemorrhage) and calcification by exaggerating susceptibility signal intensity, which is more sensitive than T2 gradient echo.