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Quantitative Susceptibility Mapping of Intracerebral Hemorrhages at Various Stages
Author(s) -
Chang Shixin,
Zhang Jingwei,
Liu Tian,
Tsiouris Apostolos John,
Shou Jian,
Nguyen Thanh,
Leifer Dana,
Wang Yi,
Kovanlikaya Ilhami
Publication year - 2016
Publication title -
journal of magnetic resonance imaging
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.563
H-Index - 160
eISSN - 1522-2586
pISSN - 1053-1807
DOI - 10.1002/jmri.25143
Subject(s) - quantitative susceptibility mapping , medicine , susceptibility weighted imaging , magnetic resonance imaging , intracerebral hemorrhage , gradient echo , hematoma , venous blood , radiology , nuclear medicine , pathology , subarachnoid hemorrhage
Purpose To investigate the magnetic susceptibility of intracerebral hemorrhages (ICH) at various stages by applying quantitative susceptibility mapping (QSM). Materials and Methods Blood susceptibility was measured serially using QSM after venous blood withdrawal from healthy subjects. Forty‐two patients who provided written consent were recruited in this Institutional Review Board‐approved study. Gradient echo magnetic resonance imaging (MRI) data of the 42 patients (17 females; 64 ± 12 years) with ICH were processed with QSM. The susceptibilities of various blood products within hematomas were measured on QSM. Results Blood susceptibility continually increased and reached a plateau 96 hours after venous blood withdrawal. Hematomas at all stages were consistently hyperintense on QSM. Susceptibility was 0.57 ± 0.48, 1.30 ± 0.33, 1.14 ± 0.46, 0.40 ± 0.13, and 0.71 ± 0.31 ppm for hyperacute, acute, early subacute, late subacute, and chronic stages of hematomas, respectively. The susceptibility decrease from early subacute (1.14 ppm) to late subacute (0.4 ppm) was significant ( P < 0.01). Conclusion QSM reveals positive susceptibility in hyperacute hematomas, indicating that even at their hyperacute stage, deoxyhemoglobin may exist throughout the hematoma volume, not just at its rim, as seen on conventionalT 2 *imaging. QSM also reveals a reduction of susceptibility from early subacute to late subacute ICH, suggesting that methemoglobin concentration decreases at the late subacute stage. J. Magn. Reson. Imaging 2016;44:420–425.