【摘要】 目的 探讨双源CT双能量虚拟平扫技术在颈部肿大淋巴结中的临床应用价值。方法 回顾分析48例经病理证实并行颈部CT常规平扫及双能量模式增强扫描的颈部淋巴结肿大患者的影像资料,利用“Liver VNC”软件处理得到虚拟平扫图像。对颈部肿大淋巴结虚拟平扫(virtual non-contrast,VNC)图像和常规平扫(conventional non-contrast,CNC)图像在平均CT值、噪声,信号噪声比(signal to noise ratio,SNR),图像质量,对病灶的显示情况,辐射剂量(用CTDIvol和DLP表示)等方面进行比较研究。结果 常规平扫和虚拟平扫所测颈部肿大淋巴结的平均CT值差异无统计学意义(P>0.05);虚拟平扫图像噪声明显低于常规平扫,而信号噪声比明显高于常规平扫(P<0.05);虚拟平扫图像质量低于常规平扫但差异无统计学意义(P>0.05);虚拟平扫及常规平扫对颈部肿大淋巴结内坏死均可见显示;双能量扫描模式较常规扫描模式的总辐射剂量小(P<0.05)。结论 在颈部肿大淋巴结检查中,1次双能量增强扫描可获得增强图像和VNC图像,而VNC图像基本不影响病灶的观察同时显著降低了辐射剂量,具有潜在的临床应用价值。更多还原

【Abstract】 Objective To investigate the clinical applied value of dual-energy virtual non-contrast(VNC) of dual-source CT for the cervical lymph nodes.Methods 48 cases with pathological diagnosis of cervical lymph nodes underwent conventional non-contrast(CNC)and dual-energy enhanced scanning.VNC images were obtained through dual energy post-processing software.Mean CT values,signal to noise ratio(SNR),image quality,lesion’s detectability and radiation dose were comparatively analysed between routine non-contrast and VNC.Results CT attenuations of the cervical lymph nodes between CNC and VNC images were not significantly different(P>0.05).The image noise of VNC images was significantly lower than that of CNC,while the SNR of VNC images was significantly higher than that of CNC(P<0.05).The image quality of VNC was lower than that of CNC,however the difference was not statistically significant(P>0.05).The necrosis of the cervical lymph nodes could be detected by both CNC and VNC,and the difference was not statistically significant between them(P>0.05).The radiation dose of VNC was lower than that of VNC(P<0.05).Conclusion In the cervical lymph nodes,enhanced images and virtual VNC images can be obtained with dual-energy enhanced scanning.VNC images are effective to detect lesions,and can significantly reduce the radiation dose,it has a potential clinical role.更多还原