Diffusion-weighted imaging in ischemic stroke: effect of display method on observers' diagnostic performance.

Area of Science:

• Neurology
• Radiology
• Medical Imaging

Background:

• Diffusion-weighted magnetic resonance imaging (DWI) is crucial for evaluating ischemic stroke.
• The impact of display methods on DWI interpretation has not been extensively studied.
• Accurate and efficient stroke detection relies on optimal image visualization.

Purpose of the Study:

• To investigate whether standardizing the display method for DWI influences observers' diagnostic performance in detecting ischemic stroke.
• To compare a standardized display method (SDM) with a conventional display method (CDM) for DWI interpretation.

Main Methods:

• Twenty-six observers assessed 40 DWI studies (20 stroke patients, 20 controls) using the Alberta Stroke Programme Early CT Score (ASPECTS) and a modified ASPECTS-DWI system.
• Images were reviewed under both SDM and conventional display method (CDM) conditions.
• Diagnostic performance was evaluated using receiver-operating characteristic analysis, and reading times were recorded.

Main Results:

• The SDM showed a trend toward higher diagnostic accuracy (Area Under the Curve) compared to CDM, though not statistically significant overall.
• Diagnostic accuracy for detecting ischemic stroke in the insular ribbon was significantly higher with the SDM (P = .036).
• The mean reading time was significantly reduced by 7.5 seconds with the SDM (P = .024).

Conclusions:

• Standardized display method (SDM) enhances diagnostic accuracy for the insular ribbon in DWI and shortens interpretation time.
• The SDM did not significantly improve overall observer performance with the ASPECTS-DWI system.
• Optimizing DWI display methods is important for improving stroke detection efficiency and accuracy in specific brain regions.