[Distinguishing between occluded and low-flow vessels with PROPELLER DWI sequence: a phantom study].

Area of Science:

• Medical Imaging
• Radiology
• Neuroimaging

Context:

• Distinguishing between vessel occlusion and slow flow is critical for diagnosing cerebrovascular diseases.
• Traditional imaging techniques may struggle to differentiate these conditions accurately.
• Diffusion-weighted imaging (DWI) is a powerful tool for assessing tissue water diffusion, but its application in slow flow scenarios requires optimization.

Purpose:

• To evaluate the efficacy of PROPELLER DWI in differentiating vessel occlusion from slow flow.
• To compare the performance of PROPELLER DWI against other established imaging sequences, including spin-echo T1-weighted imaging (SE T1WI), fast-spin-echo T2-weighted imaging (FSE T2WI), 2D phase-contrast imaging (2D PC), and 2D time-of-flight imaging (2D TOF).

Summary:

• A flow phantom study measured signal-intensity ratios across various imaging sequences at different flow velocities.
• PROPELLER DWI demonstrated the smallest signal-intensity ratio at low flow velocities (1.37 cm/s) when compared to SE T1WI, FSE T2WI, 2D PC, and 2D TOF.
• The results indicate PROPELLER DWI provides the optimal signal intensity ratio for differentiating vessel occlusion from slow flow.

Impact:

• PROPELLER DWI offers a more robust and accurate method for detecting slow blood flow compared to conventional DWI sequences like single-shot echo-planar imaging (EPI).
• Its high spatial resolution and robustness to artifacts make it suitable for evaluating arteries in challenging regions such as the skull base and parasellar areas.
• This technique has the potential to improve the diagnosis and management of cerebrovascular conditions characterized by altered blood flow.