Variants of the circle of willis on non-contrast magnetic resonance angiography

Evaluate and describe the prevalence of variations of the CoW by using three-dimensional time-of-flight MR angiography (3D-TOF-MRA). Materials and methods: We conducted a cross-sectional description in 102 patients after meeting the requirements of inclusion criteria. All participants were scanned in a GE Optima 360 1.5T MRI scanner.