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FIG 3. Standard head position for intracranial CT angiography.
A, Axial source image from CT angiogram shows degradation of image due to beam-hardening artifacts from clips (two) on left middle cerebral artery aneurysms.
B, Shaded-surface-display image from CT angiogram viewed from above shows middle cerebral arteries (arrows) and metallic beam-hardening artifact.
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