牛朋影,蒋磊,刘渊,蔡中,张涛.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[J].中国医学影像技术,2017,33(2):285~289
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
Comparison of different techniques of dual-energy CT in head and neck angiography image optimization of low-dose contrast media
投稿时间:2016-08-01  修订日期:2016-11-17
DOI:10.13929/j.1003-3289.201608004
中文关键词:  体层摄影术,X线计算机  血管造影术  图像处理,计算机辅助  图像质量
英文关键词:Tomography,X-ray computed  Angiography  Image processing,computer-assisted  Image quality
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作者单位E-mail
牛朋影 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, 宁夏 银川 750001  
蒋磊 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, 宁夏 银川 750001  
刘渊 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, 宁夏 银川 750001  
蔡中 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, 宁夏 银川 750001 13995281313@163.com 
张涛 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, 宁夏 银川 750001  
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中文摘要:
      目的 探讨传统线性120 kVp、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(2.0 ml/s)、低剂量(总剂量20 ml)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120 kVp(A组)、非线性融合(B组)及虚拟高级单能量40 keV(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40 keV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。
英文摘要:
      Objective To explore the application value of traditional linear-blended 120 kVp, advanced virtual monoenergetic reconstruction and nonlinear blending technique in the optimization of head and neck CTA image quality of ultra low dose contrast media.Methods Twenty patients underwent dual energy executive head and neck CTA using low injection rate (2.0 ml/s) and low total volume (20 ml) of contrast agent. After post-processing, the images of traditional linear-blended 120 kVp (group A), non-linear blending (group B) and 40 keV images using an advanced virtual monoenergetic (Mono+) reconstruction (group C) were obtained. In the MIP axial image, the image quality of the middle cerebral artery and the internal carotid artery was evaluated by subjective score; the CT values of the internal carotid artery and the middle cerebral artery were measured, then of CNR was calculated. The statistical analysis was performed.Results There were significant differences in subjective scores of image quality in the middle cerebral artery and the internal carotid artery among three groups (F=38.84, 37.38, P<0.001), score of the middle cerebral artery and internal carotid artery in group B and group C were better than those of group A (P<0.001). There were no significant differences in the score of internal carotid artery and middle cerebral artery in group B and C (P=0.32, 0.16). CT and CNR of the internal carotid artery and middle cerebral artery among three groups were statistically significant (P<0.001). CT and CNR in group B and C were higher than those in group A (all P<0.05); the CT values of internal carotid artery and middle cerebral artery in group C were significantly higher than those in group B (both P<0.05). There was no significant difference in CNR between the group B and C (P=0.43), the CNR of the middle cerebral artery in group B was greater than that in group C (P=0.002).Conclusion Both advance monoenergetic reconstruction and non-linear blending technique can improve image quality of carotid and cerebrovascular CTA. Non-linear blending may be preferred for cerebrovascular CTA.
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