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Assessment of Virtual Monoenergetic Images in Run-off Computed Tomography Angiography: A Comparison Study to Conventional Images From Spectral Detector Computed Tomography.

径流计算机断层扫描血管造影中虚拟单能图像的评估: 与光谱探测器计算机断层扫描常规图像的比较研究。

  • 影响因子:1.48
  • DOI:10.1097/RCT.0000000000001126
  • 作者列表:"Ren H","Zhen Y","Gong Z","Wang C","Chang Z","Zheng J
  • 发表时间:2021-03-01
Abstract

OBJECTIVE:The aims of this study were to evaluate image quality of virtual monoenergetic images (VMIs) compared with conventional images (CIs) from spectral detector CT (SDCT) and to explore the optimal energy level in run-off computed tomography angiography (CTA). METHODS:The data sets of 35 patients who received run-off CTA on the SDCT were collected in this retrospective study. Conventional images were generated via iterative reconstruction algorithm and VMI series from 40 to 120 keV were generated via spectral reconstruction algorithm. The objective indices including vascular attenuation, noise, signal-to-noise ratio, and contrast-to-noise ratio were compared. Two readers performed subjective evaluation using a 5-point scale. RESULTS:The attenuation showed higher values compared with CIs at 40 to 60 keV (P < 0.001). The noise was similar in 60- to 80-keV VMIs and significantly decreased in 90- to 120-keV VMIs (P < 0.001) in comparison with CIs. The signal-to-noise ratio and contrast-to-noise ratio were improved in 40- to 60-keV VMIs compared with CIs (P < 0.05). The score of subjective assessment was higher than that of CIs in 50- to 70-keV VMIs (P < 0.001). CONCLUSIONS:Virtual monoenergetic images can provide improved image quality compared with CIs from SDCT in run-off CTA, and VMIs at 60 keV may be the best choice in evaluating lower extremity arteries.

摘要

目的: 评价能谱CT (SDCT) 中虚拟单能量图像 (VMIs) 与常规图像 (CIs) 的图像质量,探讨流出道CT血管造影 (CTA) 的最佳能量水平。 方法: 本回顾性研究收集了35例在SDCT上接受流排CTA的患者的数据。传统图像通过迭代重建算法生成,VMI系列从40到120 keV通过光谱重建算法生成。比较血管衰减、噪声、信噪比和对比噪声比等客观指标。两名读者使用5分量表进行主观评价。 结果: 与CIs相比,40 ~ 60 kev时的衰减值较高 (P <0.001)。与CIs相比,噪声在60至80kev的vmi中相似,并且在90至120 keV的vmi中显著降低 (P <0.001)。与CIs相比,40 ~ 60 keV VMIs的信噪比和对比噪声比得到改善 (P <0.05)。在50 ~ 70kev的VMIs中,主观评价得分高于CIs (P <0.001)。 结论: 与SDCT的CIs相比,虚拟单能量图像可以提供更好的图像质量,60 kev的VMIs可能是评估下肢动脉的最佳选择。

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