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Cerebral ischemia and infarction
A N Hasso1, W A Stringer, K D Brown
1Loma Linda University School of Medicine, California.
Insights
Magnetic resonance imaging (MRI) is increasingly preferred for evaluating cerebral infarction and transient ischemic attacks (TIAs). MRI offers superior visualization of subtle changes and complex structures compared to CT scans.
Area of Science:
- Neurology
- Radiology
- Vascular Medicine
Background:
- Cerebral infarction commonly stems from atherosclerotic disease in carotid and vertebrobasilar arteries.
- Transient ischemic attacks (TIAs) are precursors to infarction, indicating underlying cerebrovascular disease.
- Hemorrhagic transformation of infarcts can occur due to reperfusion or emboli.
Purpose of the Study:
- To evaluate the role of Magnetic Resonance (MR) imaging in diagnosing cerebral infarction and TIAs.
- To compare the efficacy of MR imaging and MR angiography with Computed Tomography (CT) in stroke evaluation.
Main Methods:
- Review of current imaging techniques for cerebral infarction and TIAs.
- Comparison of MR imaging (including MR angiography) with CT for detecting acute and subacute stroke.
- Assessment of MR's ability to visualize subtle alterations, mass effect, and complex posterior fossa structures.
Main Results:
- MR imaging is increasingly utilized for acute and subacute stroke phases.
- MR imaging and MR angiography combination is replacing CT, especially for TIAs.
- MR provides superior visualization of subtle contrast changes, mass effect, and complex anatomy compared to CT.
Conclusions:
- MR imaging is highly effective for evaluating cerebral ischemia and infarction.
- The ability of MR to identify vascular structures and flow abnormalities makes it ideal for stroke assessment.
- MR's advanced visualization capabilities surpass CT in diagnosing complex cerebrovascular events.
Abstract:
Cerebral infarction is most commonly related to atherosclerotic disease in the carotid and vertebrobasilar circulations. TIAs are manifestations of this same disease process and may occur before a complete infarction. The transformation of pale to hemorrhagic infarction may result from reperfusion of an infarct or from migration of an embolus. CT is often the primary imaging study to exclude frank hemorrhage. The use of MR is increasing, in both the acute and the subacute phases of stroke. The combination of MR imaging and MR angiography is gradually replacing CT, particularly in patients with TIAs. In addition, the depiction of minute alterations in contrast and subtle mass effect is visualized with MR more often than with CT. The precise localization of brain stem and posterior fossa infarctions is improved by the ability of MR to view complex structures in two or more orthogonal planes. Vascular structures are readily identified both on the spin echo images and with MR angiography. Slow or obstructed flow in the venous channels may be recognized, which makes MR the ideal examination for the evaluation of cerebral ischemia and infarction.