双能量CT不同技术在低剂量对比剂头颈CTA图像优化中的对比

发布时间：2018-05-27 04:40

本文选题：体层摄影术 + X线计算机　；参考：《中国医学影像技术》2017年02期

【摘要】：目的探讨传统线性120kVp、高级虚拟单能量重建技术与非线性融合技术在低剂量对比剂头颈部CTA图像质量优化中的应用价值。方法对20例患者低流率(2.0ml/s)、低剂量(总剂量20ml)注射对比剂,双能量模式下行头颈部CTA检查,经后处理获得传统线性120kVp(A组)、非线性融合(B组)及虚拟高级单能量40keV(C组)图像。于MIP轴位图像上对大脑中动脉及颈内动脉图像质量进行主观评分,测量颈内动脉及大脑中动脉CT值,计算CNR;并对结果进行统计学分析。结果3组间大脑中动脉和颈内动脉图像质量主观评分差异有统计学意义(F=38.84、37.38,P均0.001),B、C组大脑中动脉和颈内动脉评分均优于A组(P均0.001);B、C组间颈内动脉及大脑中动脉评分差异无统计学意义(P=0.32、0.16)。3组颈内动脉及大脑中动脉CT值及CNR差异有统计学意义(P均0.001)。B、C组颈内动脉及大脑中动脉CT值及CNR均大于A组(P均0.05);C组颈内动脉及大脑中动脉CT值明显高于B组(P均0.05)。B、C组颈内动脉CNR差异无统计学意义(P=0.43),B组大脑中动脉CNR大于C组(P=0.002)。结论虚拟高级单能量40keV及非线性融合技术均可提高头颈CTA的图像质量,非线性融合技术可优选用于颅内血管CTA。
[Abstract]:Objective to investigate the application value of traditional linear 120kVp, advanced virtual single energy reconstruction technique and nonlinear fusion technique in the quality optimization of head and neck CTA images with low dose contrast agent. Methods Twenty patients with low flow rate and low dose (total dose of 20 ml) were injected with contrast agent. The head and neck CTA were examined by double energy mode. The images of traditional linear 120kVp(A group, nonlinear fusion group B) and virtual advanced single energy 40keV(C group were obtained after post-processing. The image quality of middle cerebral artery (MCA) and internal carotid artery (ICA) were evaluated on MIP axial images, and the CT values of medial carotid artery and middle cerebral artery were measured, and the results were analyzed statistically. Results there were significant differences in the image quality of the middle cerebral artery and the internal carotid artery among the three groups. The scores of the middle cerebral artery and the internal carotid artery in group C were significantly higher than those in group A (P 0.001) and the scores of the middle cerebral artery and the middle cerebral artery in group C were lower than those in group A (P = 0.001). The CT value and CNR of the internal carotid artery and the middle cerebral artery in group A were significantly higher than those in group A (P = 0.001) and the CNR of the middle cerebral artery in group C were higher than those in group A (P = 0.05) and the CT value of the middle cerebral artery in group C was higher than that in group A (P = 0.05). There was no significant difference in CNR of internal carotid artery between group B and group B (P < 0.05). The CNR of middle cerebral artery in group B was higher than that in group C (P = 0.43). Conclusion Virtual advanced single energy 40keV and nonlinear fusion techniques can improve the image quality of head and neck CTA.
【作者单位】：宁夏回族自治区人民医院北方民族大学教学合作医院医学影像中心;
【分类号】：R816.1

【参考文献】