TOF and SNAP are both useful angiographic imaging sequences. In this study, we compared signal patterns of intracranial arteries depicted by the two techniques and explored their relationship with blood flow velocity. Twenty-four subjects with carotid atherosclerosis were imaged. The number of distal intracranial branches were scored based on the MRA images. SNAP showed more variation across subjects than TOF. TOF MRA score seems more strongly correlated with carotid velocity. This suggests TOF MRA may be more robust, while SNAP MRA may be more sensitive to flow change, although the underlying mechanism needs further clarification in the future.
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