Influence of Geometric and Hemodynamic Parameters on Aneurysm Visualization during Three-Dimensional Rotational Angiography: An in Vitro Study
Ulrike U. Ernemanna,
Eckart Grönewällera,
Frank B. Duffnerb,
Oezlem Guervita,
Joerg Claassena and
Martin D. Skaleja
a Department of Neuroradiology, University Hospital Tuebingen, Germany
b Department of Neurosurgery, University Hospital Tuebingen, Germany
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FIG 1. Aneurysm models 1–5. Arrows indicate the direction of blood flow. A indicates parent artery; B, ostium width, C, dome height; and D, dome diameter.
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FIG 2. Model 2, wide-necked aneurysm in the MCA bifurcation and AcoA. Voxel size, 0.25 mm.
A, The 5-second rotation with continuous flow shows filling defects in both aneurysms (arrows).
B, The 8-second rotation with continuous flow shows a slight defect in the MCA aneurysm (arrow).
C, Accurate visualization of the aneurysm is achieved in the 8-second rotation with the bolus injection.
D, The 14-second rotation with continuous flow has higher plasticity, but it does not provide any additional information about the geometry of the aneurysm.
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FIG 3. Model 1, small-necked aneurysm in the MCA bifurcation. Voxel size, 0.13 mm.
A, The 8-second rotation with continuous flow shows a filling defect at the medial wall of the aneurysm (arrow).
B, The 8-second rotation with bolus injection provides accurate 3D visualization of the shape of the aneurysm.
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FIG 4. Model 3, small-necked giant lateral aneurysm. Voxel size, 0.16 mm.
A, The true shape of the aneurysm was not visualized on the 3D reconstruction.
B, The 14-second rotation with a bolus injection reveals only the distal aneurysmal shell.
C, In the 14-second rotation, the proximal wall of the aneurysm is not clearly delineated, even after the administration of contrast material at a rate of 5 mL/s.
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FIG 5. Model 4, large-necked giant lateral aneurysm with large neck. Voxel size, 0.18 mm. The 8-second rotation with a bolus injection enables complete visualization of the shape of the aneurysm.
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