Sensitivity of the neuroimaging techniques in ischemic stroke

Area of Science:

• Neurology
• Radiology
• Medical Imaging

Background:

• Acute ischemic stroke diagnosis relies heavily on timely and accurate neuroimaging.
• Early detection is crucial for initiating appropriate treatment and improving patient outcomes.

Purpose of the Study:

• To compare the sensitivity and effectiveness of computed tomography (CT), magnetic resonance imaging (MRI), and diffusion-weighted imaging (DWI) in diagnosing acute ischemic stroke.
• To evaluate the diagnostic performance of these techniques at different time points after stroke symptom onset.

Main Methods:

• A prospective study involving 190 patients with acute ischemic stroke.
• Initial CT scans were performed within 12 hours of symptom onset.
• Subsequent neuroimaging (CT, MRI, and/or DWI) was conducted between days 3 and 5 of hospitalization.

Main Results:

• Early CT (within 12 hours) detected positive findings in 32% of patients, primarily in total anterior circulation infarcts (52%).
• After 48 hours, sensitivity increased: CT (85%), MRI (93.5%), and DWI (98.8%).
• MRI demonstrated significantly higher sensitivity than CT (88% vs. 72%, P=0.01), particularly for lacunar infarcts (75% vs. 50%, P=0.005). DWI showed slightly higher detection rates than MRI after 48 hours.

Conclusions:

• Within 12 hours, CT is mainly reliable for detecting cortical ischemic strokes in the anterior circulation.
• After 48 hours, CT, MRI, and DWI exhibit high sensitivity across all stroke subtypes.
• MRI is more sensitive than CT for detecting ischemic lesions, while DWI offers comparable performance to MRI in later stages.