Article Figures & Data
Figures
- 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.
- 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.
- 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.
Tables
Volume misestimating of ellipsoid calculation regarding volume provided by 3D measurements
Number Mean Greater Dimension (mm) Mean Volume Misestimating (%) Locations MCA 125 7 ± 3 + 13 ± 41 AcomA 116 7 ± 3 + 14 ± 37 PcomA 55 7 ± 4 + 22 ± 44 ICA oph 42 9 ± 5 + 16 ± 32 Basilar tip 35 8 ± 4 + 8 ± 27 ICA supra 33 9 ± 5 + 17 ± 30 Cavernous sinus 25 8 ± 4 + 19 ± 46 ICA bifurcation 23 7 ± 4 + 13 ± 33 Pericallosal 11 5 ± 2 + 6 ± 22 Laterobasilar 5 7 ± 4 + 24 ± 52 Superior cerebellar 5 4 ± 2 − 11 ± 27 Vertebral 4 13 ± 3 + 23 ± 18 PCA 3 7 ± 3 + 43 ± 59 PICA 2 5 ± 0 + 10 ± 13 Kruskal-Wallis test P = .6508 Sizes <10 mm 385 6 ± 2 + 10 ± 35 ≥10 mm 99 13 ± 4 + 32 ± 44 Mann-Whitney test P < .0001 All sizes and locations 484 8 ± 4 + 15 ± 38 Note:— MCA indicates cerebral artery; AcomA, anterior communicating artery; PcomA, posterior communicating artery; ICA oph, carotid ophthalmic; ICA supra, supraclinoid internal carotid artery (other than ICA oph and PcomA); PCA, posterior cerebral artery; PICA, posterior-inferior cerebellar artery.
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