Magnetic Resonance Imaging in Cerebrovascular Disease
Summary
Magnetic resonance imaging (MRI) has become an indispensable tool in the assessment of cerebrovascular disorders, offering high soft-tissue contrast and a spectrum of techniques to characterise both ischaemic and haemorrhagic injury. Diffusion-weighted imaging (DWI) permits early detection of cytotoxic oedema within minutes of vessel occlusion, while perfusion-weighted imaging (PWI) maps regional cerebral blood flow and volume to identify penumbral tissue at risk. Fluid-attenuated inversion recovery (FLAIR) sequences accentuate lesions in the subacute phase, facilitating the estimation of stroke onset in unwitnessed events. Susceptibility-weighted and T2*-weighted imaging detect microbleeds and haemorrhagic transformation, which critically inform therapeutic decisions. Advanced applications such as arterial spin-labelling (ASL) and magnetic resonance angiography (MRA) quantify cerebral blood flow without contrast and visualise vascular anatomy respectively, supporting management of stenoses and collateral circulation. Quantitative metrics, including apparent diffusion coefficient (ADC) values, are increasingly employed as biomarkers of tissue viability and predictors of clinical outcome. Together, these techniques enable comprehensive evaluation—from hyperacute stroke triage and endovascular therapy planning to long-term monitoring of angiopathy, collateral recruitment and neuroplastic remodelling.
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Magnetic Resonance Imaging in Cerebrovascular Disease publication trend
The graph below shows the total number of articles in magnetic resonance imaging in cerebrovascular disease across all publications each year (not limited to Nature Index journals).
Technical terms
Diffusion-weighted imaging (DWI): An MRI sequence sensitive to the random motion of water molecules, allowing early detection of cytotoxic oedema in acute ischaemia.
Apparent diffusion coefficient (ADC): A quantitative measure derived from DWI that reflects the magnitude of water diffusion within tissue.
Fluid-attenuated inversion recovery (FLAIR): A T2-weighted sequence that suppresses cerebrospinal fluid signal, enhancing lesion conspicuity in subacute and chronic stages.
Perfusion-weighted imaging (PWI): Techniques that assess cerebral blood flow and volume, typically using dynamic contrast or arterial spin-labelling to evaluate penumbral tissue.
Arterial spin-labelling (ASL): A non-contrast perfusion method that labels inflowing blood magnetically to quantify cerebral blood flow.
Magnetic resonance angiography (MRA): An imaging technique that visualises blood vessels using flow-sensitive sequences, with or without contrast agents.
T2*-weighted imaging (susceptibility-weighted): A sequence sensitive to magnetic susceptibility differences, used to detect microhaemorrhages and calcifications.
References
- Use of FLAIR Imaging to Identify Onset Time of Cerebral Ischemia in a Canine Model. American Journal of Neuroradiology (2013).
- Temporal and sequence-related variability in diffusion-weighted imaging of presumed cerebrovascular accidents in the dog brain. Frontiers in Veterinary Science (2022).
- Ischemic stroke can have a T1w hyperintense appearance in absence of intralesional hemorrhage. Frontiers in Veterinary Science (2022).
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