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AJNR - American Journal of Neuroradiology

Published ahead of print on January 9, 2008
doi: 10.3174/ajnr.A0893

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Nonhelical Acquisition CT Angiogram after Aneurysmal Clipping: In Vitro Testing Shows Diminished Artifact

A.C. Mamourian^a, K. Erkmen^b and D.J. Pluta^a

^a Department of Radiology, Dartmouth-Hitchcock Medical Center, Lebanon, NH
^b Department of Neurosurgery, Dartmouth-Hitchcock Medical Center, Lebanon, NH

View larger version (58K): [in this window] [in a new window]   Fig 1. The helical acquisition of the titanium clip (A) shows the lines of alternating white and dark arising from the clip. The axial scan done with an otherwise identical technique (B) shows a diminished artifact in comparison to the helical acquisition.

View larger version (54K): [in this window] [in a new window]   Fig 2. A, This 3D reformatted image with use of a Vitrea workstation shows blurring of the margins of the aneurysmal clip on the side of the clip (large arrow). The aneurysmal dome is visible (small arrow). The axial acquisition (B) more clearly demonstrates the aneurysmal clip, with fewer artifacts arising from the margins of the clip, particularly at the level of the spring.

View larger version (48K): [in this window] [in a new window]   Fig 3. These 3D models were generated from the axial CTA acquisition. Images of the clip viewed from superior to inferior (A) and inferior to superior (B) show the relationship of the clip (large white arrow) to the A2 segments of the anterior cerebral arteries (small arrows). The maximum intensity projection image in the coronal plane (C) again demonstrates the relationships of the clip (large arrow) to the A2 segments (small arrows) and also highlights the narrow coverage of the axial acquisition while still including the pertinent anatomy around the clip and vessels distal to the clip.