双层探测器光谱CT单能量成像在泪道造影中的应用研究

The Application Value of Monoenergetic Imaging on Dual-layer Spectral Detector Computed Tomography in Dacryocystography

目的:探讨双层探测器光谱CT单能量成像在泪道造影中的临床应用价值。方法:对临床怀疑泪道阻塞的患者行光谱CT泪道扫描,将光谱CT的各单能量keV图像的信号噪声比(SNR)和对比噪声比(CNR)做比较,对图像质量进行主观评分,并对患者泪道阻塞部位和狭窄程度与手术或内镜比对进行诊断符合率评估。结果:50 keV图像的SNR为9.76±13.44,比70~200 keV图像的SNR高,有统计学意义;50 keV图像的CNR为10.24±13.88,比70~200 keV图像的CNR高,有统计学意义。50 keV和常规图像质量主观评分分别为(5,5)和(4,5),医师间主观评分一致性良好。结论:50 keV单能量图像显著提高CT泪道造影的信噪比和对比噪声比且主观评分一致性良好。

Objective:This study aimed to explore the value of monoenergetic imaging using dual-layer spectral detector computed tomography(CT)for dacryocystography.Methods:Dacryocystography was performed in patients with clinically suspected lacrimal duct obstruction using a Philips IQon dual-layer spectral detector CT.The objective evaluation included the signal-to-noise ratio(SNR)and contrast-to-noise ratio(CNR)of each monoenergetic image,subjective rating of image quality,and the site and degree of lacrimal duct obstruction.Results:The SNR and CNR of 50 keV images was 9.76±13.44 and 10.24±13.88,respectively,which were significantly lower than that of 70~200 keV images.The subjective scores for 50 keV and conventional image quality were(5,5)and(4,5),respectively,indicating good consistency in subjective scores among radiologists.Conclusion:The SNR and CNR of CT dacryocystography increased significantly at 50 keV.