三代双源双能量CT新虚拟单能量技术在旋股内、外侧动脉成像中的应用价值

发布时间：2018-03-17 03:09

本文选题：双源CT　切入点：新虚拟单能量图像　出处：《郑州大学》2017年硕士论文　论文类型：学位论文

【摘要】：背景与目的评价三代双源双能量CT新虚拟单能量技术(advanced virtual monoenergetic technique,mono-plus)提高旋股内、外侧动脉成像质量的价值。材料与方法收集40例行三代双源双能量CT腹部动脉CTA增强检查(自髂前上棘水平至股骨中段扫描)患者图像,采用双能量模式(90/150SnkVp)扫描,重建后的影像数据均预先用设备自带Syngo.via VA30A,Siemens工作站进行后处理,通过Monoenernetic Plus功能获得40keV mono-plus图像(组1),Optimum Contrast功能获得非线性融合图像(组2),最佳CNR单能量曲线(optimal CNR)获得最佳kev单能量图像(组3)。扫描时获得混合能量(Mixed,混合系数0.5)图像(组4)。分别计算并比较四组图像中股动脉(一级动脉)、股深动脉(二级动脉)、旋股外侧动脉(三级动脉)、旋股外侧动脉横支(四级动脉)、旋股内侧动脉(三级动脉)、旋股内侧动脉深支(四级动脉)的CT值、信噪比(SNR)、对比噪声比(CNR)以及图像质量主观评分。结果对40例患者定量分析结果显示,总四级动脉分支的CT值都呈现出40keV mono-plus组最高,混能组最低(P0.05)。虽然40keV mono-plus组的总四级动脉分支的SNR值均没有非线性融合图像高(P0.05),但第一、二级动脉分支的SNR值仍高于混能组(P0.05),且与最佳单能组没有统计学差异(P0.05),第三、四级动脉分支的SNR值与混能组、最佳单能组均无统计学差异(P0.05)。在40keV mono-plus组的SNR值良好的基础上,其CNR值于总四级动脉分支均显著优于其余三组图像(P0.01),并且其主观评分也明显优于其余三组图像。结论在髂腹股沟区动脉不同重建模式图像的显示上,40keV mono-plus模式重建图像质量明显优于非线性融合、最佳单能量以及混合能量模式重建图像,除股动脉、股深动脉比其余三组图像显示更好之外,旋股内、外侧动脉的远端及其细小的动脉分支也能清晰显示,推荐其作为股骨头供血动脉DE-CTA扫描的常规重建模式。
[Abstract]:Background & AIM to evaluate the new virtual single energy technique of three generations dual source and dual energy CT (DECT) with advanced virtual monoenergetic technique mono-plus). Materials and methods the images of 40 patients (from the anterior superior iliac spine level to the middle femur) were collected in 40 patients with double source and dual energy CT abdominal artery CTA enhancement (from the level of anterior superior iliac spine to the middle femur), and were scanned by double energy mode 90 / 150SnkVp. The reconstructed image data were pre-processed with Syngo.via VA30A Siemens workstation. 40 Kev mono-plus images obtained by Monoenernetic Plus function (group 1 optimum Contrast function to obtain nonlinear fusion image (group 2, optimal CNR single energy curve) to obtain optimal kev single energy image (group 3. Mixed energy, mixing coefficient 0. 5). (group 4) calculate and compare the femoral artery (primary artery, deep femoral artery, lateral femoral circumflex artery, lateral femoral circumflex artery, lateral femoral circumflex artery, lateral femoral circumflex artery, medial femoral circumflex artery, medial femoral circumflex artery) in the four groups. Ct value of the deep branch of medial circumflex femoral artery (fourth grade artery), Results the results of quantitative analysis in 40 patients showed that the CT values of the branches of the total four-grade arteries were the highest in the 40keV mono-plus group. Although the SNR value of the total fourth grade artery in the 40keV mono-plus group was not as high as that of the nonlinear fusion image, the SNR value of the secondary artery branch was still higher than that of the mixed energy group (P0.05), and there was no statistical difference between the two groups and the optimal monoenergetic group (P0.05), third, there was no statistical difference between the two groups. There was no statistical difference between the SNR value of the four-grade artery branch and the mixed energy group, and there was no statistical difference in the best monoenergetic group. On the basis of the good SNR value of the 40keV mono-plus group, Its CNR value was significantly better than that of the other three groups (P 0.01) and its subjective score was significantly better than that of the other three groups. Conclusion the images of different reconstruction modes of ilioinguinal artery are displayed in 40keV mono-plus mode. The image quality is obviously superior to that of nonlinear fusion. In addition to the femoral artery, the deep femoral artery and the deep femoral artery showed better than the other three groups. The distal end of the circumflex femoral artery and the lateral artery and its small branches could also be clearly displayed. It is recommended as a conventional reconstruction model for DE-CTA scan of femoral head supplying artery.
【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：R816.2;R681.8

【参考文献】