Ellipsoid approximation versus 3D rotational angiography in the volumetric assessment of intracranial aneurysms.
Ellipsoid approximation versus 3D rotational angiography in the volumetric assessment of intracranial aneurysms.
复制标题
颅内动脉瘤体积评估中的椭球近似与 3D 旋转血管造影。
DOI：
--
复制
发表时间：
2006
期刊：
影响因子：
--
通讯作者：
Jacques Moret
中科院分区：
文献类型：
--
作者：
M. Piotin;B. Daghman;C. Mounayer;L. Spelle;Jacques Moret
背景和目的
本研究的目的是比较通过计算椭球体体积获得的颅内动脉瘤体积结果与通过3D旋转血管造影（3D-RA）获得的结果。
方法
首先，必须确定3D-RA在颅内动脉瘤体积测量评估中的精度。3D-RA对球形物体的实际体积高估了4%至5.5%。然后，用3D-RA研究了484个连续的人类颅内动脉瘤，以确定其体积。同时，在3D-RA生成的3D图片上测量动脉瘤尺寸（高度和宽度）。根据公式（正文中的公式），通过将动脉瘤形状视为椭圆形来获得动脉瘤体积。
结果
计算出的动脉瘤体积（V（calc））比3D-RA给出的体积高估了15 ± 38%。考虑到10%的误差范围，227个（47%）动脉瘤被高估44 +/-34%，而113个（23%）动脉瘤被低估25 +/-12%。只有144个（30%）动脉瘤的计算结果和3D-RA结果在10%的差异范围内。胼胝体周围和基底动脉尖端动脉瘤的一致性良好（平均高估分别为6 +/- 22%和8 +/-27%）。相反，后交通动脉瘤的计算结果和3D-RA结果之间存在高度差异（平均高估22 +/- 44%）。
结论
对于胼胝体周围和基底动脉尖端动脉瘤，基于动脉瘤尺寸的体积计算相对准确，可能是由于其球形或椭圆形。相反，该公式不适用于形状不规则的病变，如后交通动脉瘤。
BACKGROUND AND PURPOSE
The purpose of this study was to compare the volumetric results of intracranial aneurysms obtained by calculation of the volume of an ellipsoid with those obtained with 3D rotational angiography (3D-RA).
METHODS
First, the precision of 3D-RA in the assessment of volumetric measurement of intracranial aneurysm had to be established. The 3D-RA gave an overestimation of 4% to 5.5% of the actual volume of a spherical object. Then, 484 consecutive human intracranial aneurysms were studied with 3D-RA, allowing the determination of their volume. In the meantime, aneurysm dimensions (height and width) were measured on the 3D pictures generated by the 3D-RA. The aneurysm volumes were obtained by considering the aneurysm shape to be ellipsoidal, according to the formula: (formula in text).
RESULTS
The calculated aneurysm volume (V(calc)) overestimated by 15 +/- 38% the volume given by 3D-RA. Taking into account a 10% margin of error, 227 (47%) aneurysms were overestimated by 44 +/- 34%, whereas 113 (23%) aneurysms were underestimated by 25 +/- 12%. Only 144 (30%) aneurysms had calculated and 3D-RA results within the limits of 10% of discrepancy. Concordance was good for pericallosal and basilar tip aneurysms (mean overestimation of 6 +/- 22% and 8 +/- 27%, respectively). Conversely, there was a high discrepancy between calculated and 3D-RA results for posterior communicating artery aneurysms (mean overestimation of 22 +/- 44%).
CONCLUSION
The calculation of the volume based on aneurysm dimensions is relatively accurate for pericallosal and basilar tip aneurysms, probably owing to their spherical or elliptic shape. Conversely, this formula is not adequate for irregularly shaped lesions, such as posterior communicating aneurysms.