O-MAR技术在颅内动脉瘤栓塞术后CTA中的应用

Application of O-MAR technique in postoperative CTA of intracranial aneurysms embolization

目的 :探讨O-MAR技术在颅内动脉瘤栓塞术后CTA中的临床应用价值。方法 :收集25例颅内动脉瘤栓塞术后CTA检查的原始数据,分别采用常规FBP重建(A组)和FBP+O-MAR重建(B组)。采用Mann-Whitney U秩和检验主观比较O-MAR去除金属伪影的效果;采用配对样本t检验或Mann-Whitney U秩和检验比较两组的客观指标(伪影的长度、弹簧圈附近组织的CT值及噪声值)的差异。结果:B组的主观评分显著高于A组(U=0.00,P<0.01)。B组较A组的伪影长度显著减短(分别为(15.4±3.2)mm和(38.8±7.1)mm,t=7.73,P<0.01)、CT值增高更接近于正常组织(t=2.99,P<0.05)、噪声值减低(分别为(35.1±12.5)HU和(137.5±58.3)HU,t=5.31,P<0.01)。结论:O-MAR技术可有效地减少颅内动脉瘤弹簧圈栓塞术后CTA的金属伪影,纠正植入体周围的CT值,改善图像质量。

Objective： To evaluate the clinical value of O-MAR technique in postoperative CTA of intracranial aneurysms embolization. Methods： Twenty-five patients with postoperative CTA of intracranial aneurysm after embolization were collected. The raw data were reconstructed by FBP（group A） and FBP＋O-MAR（group B） respectively. Mann-Whitney U test was used for comparisons of the effects of the metal artifacts reduction, t-test or Mann-Whitney U test was used for comparisons of objective evaluating indiceS （length of artifacts, CT value and image noise）. Results： The subjective scores of group B were significant higher than group A （U=0.00, P〈0.01）. There were significant differences between group B and group A in the length of artifacts （（15.4±3.2） mm and （38.8＋7.1） mm, t=7.73, P〈0.01）, CT value （t=2.99, P〈0.05） and image noise （（35.1±12.5）HU and （137.5±58.3） HU, t=5.31, P〈0.01）. Conclusion： O-MAR technique can reduce the metal artifacts effectively, correct CT values around the plants and improve the image quality.