Journal
STROKE
Volume 44, Issue 8, Pages 2315-2317Publisher
LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1161/STROKEAHA.113.001638
Keywords
gradient echo; hematoma volume; intracerebral hemorrhage; magnetic resonance imaging; quantitative susceptibility mapping
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Funding
- US NIH [R01EB013443, R43NS076092, R01NS07237]
- China National NSF [81171095]
- Zhejiang Provincial NSF [LR12H09001]
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Background and Purpose A novel quantitative susceptibility mapping (QSM) processing technology has been developed to map tissue susceptibility property without blooming artifacts. We hypothesize that hematoma volume measurement on QSM is independent of imaging parameters, eliminating its echo time dependence on gradient echo MRI. Methods Gradient echo MRI of 16 patients with intracerebral hemorrhage was processed with susceptibility-weighted imaging, R-2* (=1/T2*) mapping, and QSM at various echo times. Hematoma volumes were measured from these images. Results Linear regression of hematoma volume versus echo time showed substantial slopes for gradient echo magnitude (0.450.31 L/s), susceptibility-weighted imaging (0.52 +/- 0.46), and R-2* (0.39 +/- 0.30) but nearly zero slope for QSM (0.01 +/- 0.05). At echo time=20 ms, hematoma volume on QSM was 0.80x that on gradient echo magnitude image (R-2=0.99). Conclusions QSM can provide reliable measurement of hematoma volume, which can be performed rapidly and accurately using a semiautomated segmentation tool.
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