3-T high-b-value diffusion-weighted MR imaging in hyperacute ischemic stroke
Background and purpose: In patients with hyperacute ischemic stroke, early demonstration of infarction is essential. Diffusion weighted imaging (DWI) is the key method for detecting hyperacute infarction. The value of high b-value DWI in hyperacute ischemic stroke is controversial at 1.5T, and is un...
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| Hauptverfasser: | , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
20 February 2013
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| In: |
Journal of neuroradiology
Year: 2013, Jahrgang: 40, Heft: 3, Pages: 149-157 |
| ISSN: | 1773-0406 |
| DOI: | 10.1016/j.neurad.2012.08.007 |
| Online-Zugang: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1016/j.neurad.2012.08.007 Verlag, lizenzpflichtig, Volltext: https://www.sciencedirect.com/science/article/pii/S0150986112002295 
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| Verfasserangaben: | Michael Lettau, Mona Laible |
MARC
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| 520 | |a Background and purpose: In patients with hyperacute ischemic stroke, early demonstration of infarction is essential. Diffusion weighted imaging (DWI) is the key method for detecting hyperacute infarction. The value of high b-value DWI in hyperacute ischemic stroke is controversial at 1.5T, and is unknown at 3 T. The aim of this study is to explore the value of high b-value versus standard b-value DWI at 3 T in hyperacute stroke with quantitative and qualitative analysis. Material and methods: This study prospectively included 104 consecutive patients with hyperacute stroke. At 3 T, conventional MR sequences and DWI were performed. The examination included a standard DWI (b=1000 s/mm2) and two high b-value DWI (b=3000 s/mm2 and b=5000 s/mm2). Qualitative and quantitative analysis was performed. Results: With increasing b value, DW images appeared noisier. The number of detected lesions was significantly higher on b=3000 images than on the other DW images and higher on b=5000 images than on b=1000 images. The number of lesions greater than 1 cm was not significantly different. Lesion conspicuity was higher, boundary better seen, lesion extent bigger, and estimation of final infarct size was better on high b-value than on standard b-value DWI. Contrast-to-noise-ratio (CNR) and signal-to-noise-ratio (SNR) decreased and contrast ratio (CR) increased on high b-value DWI compared to standard b-value DWI. Conclusion: At 3 T, high b-value DWI was superior to standard b-value DWI in detection of hyperacute infarction and prediction of final infarct size in spite of increasing imaging artifacts. | ||
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