MRI of stroke using hyperpolarized 129Xe |
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| Authors: | Xin Zhou Yanping Sun Mary Mazzanti Nils Henninger Joey Mansour Marc Fisher Mitchell Albert |
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| Institution: | 1. State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Center for Magnetic Resonance, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan, China;2. Department of Radiology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA;3. Department of Radiology, University of Massachusetts Medical School, Worcester, MA, USA;4. Department of Neurology, University of Massachusetts Medical School, Worcester, MA, USA |
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| Abstract: | Because there is no background signal from xenon in biological tissue, and because inhaled xenon is delivered to the brain by blood flow, we would expect a perfusion deficit, such as is seen in stroke, to reduce the xenon concentration in the region of the deficit. Thermal polarization yields negligible xenon signal relative to hyperpolarized xenon; therefore, hyperpolarized xenon can be used as a tracer of cerebral blood flow. Using a rat permanent right middle cerebral artery occlusion model, we demonstrated that hyperpolarized 129Xe MRI is able to detect, in vivo, the hypoperfused area of focal cerebral ischemia, that is the ischemic core area of stroke. To the best of our knowledge, this is the first time that hyperpolarized 129Xe MRI has been used to explore normal and abnormal cerebral perfusion. Our study shows a novel application of hyperpolarized 129Xe MRI for imaging stroke, and further demonstrates its capacity to serve as a complementary tool to proton MRI for the study of the pathophysiology during brain hypoperfusion. Copyright © 2010 John Wiley & Sons, Ltd. |
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| Keywords: | hyperpolarized 129Xe stroke MRI rat brain infarct |
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