Diagnostic value of diffusion-weighted STEAM-MRI in ischemic stroke

Area of Science:

• Neuroimaging
• Radiology
• Stroke Diagnosis

Background:

• Diffusion-weighted imaging (DWI) is crucial for stroke detection.
• Echo-planar imaging DWI (EPI-DWI) is standard but prone to susceptibility artifacts.
• Stimulated echo acquisition mode DWI (STEAM-DWI) offers reduced artifacts.

Purpose of the Study:

• To assess the sensitivity and specificity of a novel STEAM-DWI technique.
• To evaluate STEAM-DWI's diagnostic performance in patients with suspected subacute ischemic stroke.
• To compare STEAM-DWI with EPI-DWI in detecting stroke and artifacts.

Main Methods:

• Performed EPI-DWI and STEAM-DWI on 85 patients with suspected subacute stroke using 3-T MRI.
• Three neuroradiologists independently assessed images for stroke signs, infarction characteristics, and artifacts.
• Evaluated detection rates for major infarcts and subacute microembolic lesions.

Main Results:

• Subacute stroke confirmed in 55/85 patients by EPI-DWI.
• STEAM-DWI detected stroke in 96% of confirmed cases (53/55).
• 100% sensitivity/specificity for major infarcts; 94% sensitivity for microembolic lesions; no artifacts observed with STEAM-DWI.

Conclusions:

• STEAM-DWI demonstrates high accuracy in diagnosing subacute ischemic stroke.
• It effectively detects both major infarcts and microembolic lesions.
• STEAM-DWI is a robust alternative to EPI-DWI, particularly in areas susceptible to artifacts.