Joint intracranial and carotid 3D vessel wall imaging (VWI) with an isotropic spatial resolution between 0.5-0.6 mm is promising in diagnosing arterial wall diseases but leads to clinically impractical scan time. CAIPIRINHA 3x3 undersampling with elliptical scanning is used to expedite the VWI by 11-fold without less sampling the high-frequency region of k-space. Iterative L1-ESPIRiT algorithm is employed for reconstruction with GRAPPA result as the initialization. The scheme of Iterative Feature Refinement is embedded into L1-ESPIRiT iteration to avoid potential over-smoothing issue. Finally, the 3D 11x VWI scan at an isotropic resolution of 0.6 mm takes only 3.5 minutes.
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