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Ellipsoid Approximation versus 3D Rotational Angiography in the Volumetric Assessment of Intracranial Aneurysms

M. Piotina, B. Daghmana, C. Mounayera, L. Spellea and J. Moreta

a Department of Interventional and Functional Neuroradiology, Fondation Rothschild, Paris, France


Figure 1
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  		Fig 1. A, Radiograph of the 50-mm-diameter iron ball that served for the calibration of the 3D rotational angiography (3D-RA) system.

B, Radiograph of the 5-mm-diameter iron ball that also served for the calibration of the 3D-RA system.


Figure 2
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  		Fig 2. A, Volume determination with the 3D-RA software of the 50-mm-diameter iron ball displayed with surface-shaded display. The software is giving a volume of 67.875 mm3, whereas the ellipsoid calculation is giving 65.45 mm3.

B, Volume determination with the 3D-RA software of the 5-mm-diameter iron ball displayed with surface shaded display. The software is giving a volume of 69 mm3, whereas the ellipsoid calculation is giving 65.5 mm3.


Figure 3
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  		Fig 3. Manual segmentation of a 12-mm large carotid ophthalmic artery aneurysm with the 3D rotational angiography (3D-RA) volumetric measurement software.

A, Volume-rendering display of a 3D-RA representation of the aneurysm obtained after rotational angiography of the right ICA. The gross contour of the aneurysm is first extracted with the cutting graphical tool of the software (yellow line).

B, Cutting of the aneurysm is refined to extract only the contour of the aneurysm (yellow line).

C, Finally, the volume is given by placing the segmented aneurysm inside the sphere giving a volume of 591 mm3, which corresponds to a 34% overestimation provided by the ellipsoid approximation.





Copyright © 2008 by the American Society of Neuroradiology. Print ISSN: 0195-6108 Online ISSN: 1936-959X