Angiographic Comparison of Different Velocity-Selective Labeling Modules Directly on Cerebral Arteries

Velocity-selective labeling has been utilized in both arterial spin labeling (VSASL) and angiography (VSMRA). This study evaluated the labeling characteristics directly on various cerebral arteries using VSMRA with different VS labeling modules, including double refocused hyperbolic tangent (DRHT), eight-segment B1-insensitive rotation (BIR-8), delay alternating with nutation for tailored excitation (DANTE), Fourier transform based velocity-selective saturation (FT-VSS) and inversion (FT-VSI). Their effects on both the cerebral arterial vasculature and static brain tissue were visualized angiographically and compared quantitatively. And the implication for VSASL and VSMRA are discussed.