1. Conventional GE magnitude images show both calcifications and hemorrhage as areas of hypointense signal intensity.
Conventional GE magnitude images show both calcifications and hemorrhage as areas of hypointense signal intensity. A, This is equally true for the SWI magnitude image with a TE of 40 ms at 1.5T. B, Usually, a CT scan is used to identify calcium. Here, the CT scan reveals many small calcifications. The SWI filtered-phase image is a means to differentiate paramagnetic from diamagnetic substances because the former will have a negative phase and the latter a positive phase (for a right-handed system). C, The phase image associated with the magnitude image in A shows a 1-to-1 correspondence of the positive phase with the calcifications in the CT scan (B).
S. Mittal et al. AJNR Am J Neuroradiol 2009;30:
©2009 by American Society of Neuroradiology