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Fig 4. Timed coronal (A) and sagittal (B) MRAs at 3T of different AVM patients are shown in these subtracted MIP images. Despite high S/N and spatial resolution, low temporal resolution makes it difficult to determine the order in which vessels fill and the direction of flow. Early venous enhancement (arrows) due to arteriovenous shunting is present and "degrades" the arterial phase.
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