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Intracranial calcifications and hemorrhages: characterization with quantitative susceptibility mapping
Weiwei Chen1, Wenzhen Zhu, Iihami Kovanlikaya
1From the Department of Radiology, Tongji Hospital, Tongji Medical College, Huazhong University of Science & Technology, Wuhan, China (W.C., W.Z.); Department of Radiology, Weill Cornell Medical College, 515 E 71st St, New York, NY 10021 (W.C., I.K., A.K., T.L., S.W., C.S., Y.W.); Department of Biomedical Engineering, Cornell University, Ithaca, NY (Y.W.); Department of Biomedical Engineering, Kyung Hee University, Seoul, South Korea (Y.W.); School of Electronic Engineering, University of Electronic Science and Technology of China, Chengdu, China (S.W.); and Institute of Cognitive Sciences and Technologies, Fatebenefratelli Hospital, Rome, Italy (C.S.).
Quantitative susceptibility mapping (QSM) significantly outperforms gradient-echo (GRE) phase imaging in detecting intracranial calcifications and hemorrhages. QSM offers superior sensitivity and specificity for identifying these lesions, improving diagnostic accuracy.
Area of Science:
- Neuroimaging
- Radiology
- Medical Physics
Background:
- Intracranial calcifications and hemorrhages are common findings.
- Gradient-echo (GRE) phase magnetic resonance (MR) imaging is a standard technique for their detection.
- Limitations exist in differentiating these lesions using conventional GRE phase imaging.
Purpose of the Study:
- To compare the diagnostic performance of quantitative susceptibility mapping (QSM) and GRE phase MR imaging.
- To evaluate the detection and differentiation capabilities for intracranial calcifications and hemorrhages.
Main Methods:
- Retrospective analysis of 38 patients with diagnosed intracranial calcifications/hemorrhages.
- Reconstruction of QSM and GRE phase images from identical GRE data.
- Independent assessment by two neuroradiologists for lesion identification.
- Calculation of sensitivity, specificity, and interobserver agreement.
Main Results:
- QSM demonstrated significantly higher sensitivity and specificity for hemorrhage detection compared to GRE phase imaging.
- QSM showed superior specificity for calcification detection and marginally higher sensitivity.
- QSM achieved significantly better interobserver agreement in differentiating hemorrhage from calcification (κ=0.91 vs 0.55).
Conclusions:
- Quantitative susceptibility mapping (QSM) is superior to GRE phase imaging for differentiating intracranial calcifications from hemorrhages.
- QSM offers improved sensitivity for hemorrhage detection and specificity for calcification detection.
- QSM enhances diagnostic accuracy in neuroimaging of intracranial pathologies.
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