摘要
目的比较双源CT双能量虚拟平扫(VNC)与常规平扫(CNC)在纵隔淋巴结病变检查中的临床应用价值。方法对50例临床疑诊纵隔淋巴结病变患者行双能量CT CNC和增强扫描,并重建动脉期VNC和静脉期VNC,对CNC与动、静脉期VNC图像平均CT值、SNR、图像质量评分及总辐射剂量进行比较。结果 50例患者气管杈水平胸椎椎体后方肌肉CNC及动、静脉期VNC的平均CT值、图像质量评分差异均无统计学意义(P均>0.05),SNR差异有统计学意义(P<0.05)。常规三期扫描的容积CT剂量指数、剂量长度乘积、有效剂量均高于双能量双期扫描,差异有统计学意义(P均<0.05)。恶性组、良性组、正常组淋巴结CNC及动、静脉期VNC的CT值差异均有统计学意义(P均<0.05)。结论纵隔双源CT双能量VNC与CNC图像质量无差别,均可满足临床诊断要求,且VNC辐射剂量更小。
Objective To compare clinical value of dual-energy virtual non-contrast （VNC） and conventional non-contrast （CNC） techniques in patients with lesions of mediastinal lymph nodes by dual-source CT. Methods A total of 50 patients with suspicious mediastinal lymphadenopathy underwent CNC and two-phase dual energy chest CT. The arterial and venous phase VNC images were obtained using Siemens Syngo MMWP 47136 workstaion. The mean CT value, SNR, image quali- ty and radiation dose were compared among CNC, arterial and venous phase VNC images. Results There was no statistical difference of mean CT value and image quality scores in the muscle behind the thoracic vertebral body of the tracheal bifur- cation level among CNC, arterial and venous phase VNC （all P〉0.05）. There were statistical difference of SNR among CNC, arterial and venous phase VNC （P〈0.05）. CT close index volume, dose-length product and effective dose of con- ventional three-phase scan were higher than those of dual-energy two-phase scan （all P〈0.05）. The lymph node CT values of malignant, benign and normal group were statistical difference among CNC, arterial and venous phase VNC images （P〈0. 05）. Conclusion There was no difference in images quality between VNC and CNC. Both of them are valuabe and effec- tive in clinical use. And VNC can reduce the radiation dosage.
出处
《中国医学影像技术》
CSCD
北大核心
2016年第8期1277-1280,共4页
Chinese Journal of Medical Imaging Technology
基金
贵州省科技厅社会发展科技攻关计划项目(黔科合SY字[2013]3038)
贵州省教育厅普通高等学校创新团队自然科学研究项目(黔教合人才团队字[2014]37)
关键词
淋巴结
纵隔
体层摄影术
X线计算机
虚拟平扫
辐射剂量
Lymph nodes
Mediastinum
Tomography, X-ray computed
Virtual non-contrast
Radiation dosage
