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Abstract #3323

Differentiation between Hemorrhage and Calcifications by Assessing the Dipole Patterns on Unwrapped Phase Images of Gradient-recalled Echo Sequence

Eung Yeop Kim1, Sung Hyun Yu1, and Jongho Lee2

1Radiology, Gachon University College of Medicine, Incheon, Korea, Republic of, 2Department of Electrical and Computer Engineering, Seoul National University, Seoul, Korea, Republic of

Both cerebral hemorrhages and calcifications may show similar internal heterogeneity on phase images, limiting its clinical utility. We assessed a dipole artifact (both the upper/lower poles and the equatorial region) on phase images in 123 patients with hemorrhages (n=119) and calcifications (n=75). All hemorrhagic lesions were perfectly determined, while all but one calcification showed a diamagnetic dipole pattern. The equatorial phase values (degree) were significantly different between hemorrhages and calcifications (-10.41±10.66 versus 10.86±9.53; P<0.0001). The signal intensities of both the lobes and the equatorial rim on GRE phase images accurately differentiate hemorrhages from calcifications irrespective of internal heterogeneity.

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