期刊文献+

不同噪声指数对PCP患者胸部CT图像质量的影响分析?

The Influence of Different Noise Indexes on Chest CT Image Quality for Patients with PCP
收藏 分享 导出
摘要 目的:评价以体质量指数(BMI)为指导,不同噪声指数联合Z轴自动管电流调制技术对AIDS合并PCP患者胸部CT图像质量和辐射剂量的影响。方法:采用Z轴自动管电流调制技术对30例AIDS合并PCP体质量正常的患者行常规剂量和低剂量CT平扫,常规剂量扫描预设噪声指数(noise index,NI)设置为10,低剂量扫描预设噪声指数(noise index,NI)设置为20,管电流范围:30~500 m A,管电压:120 kV。记录两次扫描的容积CT剂量指数(CT dose index of volume,CTDIvol)、剂量长度乘积(dose length product,DLP),并计算出有效剂量(effective dose,ED)。在纵隔窗下进行肺尖水平、主动脉弓水平、肺底水平三个层面的噪声值测量。以5分制对CT图像的质量及主观噪声进行评价。结果:两组图像质量主观评分均达到了临床诊断接受标准。NI为20时噪声值较NI为10时的噪声值高,差异有统计学意义(P <0.05)。NI为20时平均CTDIvol值、DLP值、ED值较NI为10时分别降低了63.20%、63.48%和63.49%,差异具有统计学意义(P <0.05)。结论:以体质量指数为指导,运用Z轴自动管电流调制技术通过设置合适的NI进行低剂量扫描,既大幅降低了AIDS合并PCP受检者的辐射剂量,又满足了CT影像诊断的需求。 Objective:To evaluate the application of different noise index combined with Z-axis automatic tube-current modulation technology,guided by body mass index(BMI),in CT chest scanning of AIDS patients with PCP.Methods:A total 30 cases of AIDS patients with PCP underwent routine dose and low dose scanning protocol with Z-axis automatic tube current modulation.The noise index(NI)for standard protocol was set to 10,the noise index(NI)for low dose protocol was set to 20,the range of tube current was set to 30-500 mA,the tube voltage was120 kV,the NI of control group was 10,and the NI of low-group was 20.The volume CT dose index(CTDIvol)and dose length product(DLP)during CT scanning were recorded and the effective dose(ED)was calculated.The noise value was measured at pulmonary tip level,aortic arch level and pulmonary base level under the longitudinal window.The quality and subjective noise of CT images were evaluated by the 5-point system.Results:The subjective scores of the two groups reached the standard of clinical diagnosis.When NI was 20,the noise was higher than that when NI was 10,and the difference between the two groups was statistically significant(P<0.05).When NI was 20,the mean CTDIvol,DLP and ED decreased by 63.20%,63.48%and 63.49%respectively compared to the low-dose group,and the difference between two groups was statistically significant(P<0.05).Conclusion:Under the guidance of BMI,by using Z-axis automatic tube-current modulation technology,the radiation dose of AIDS patients combined with PCP can be significantly reduced by setting a reasonable NI,while the quality of CT image meets the requirements of clinical diagnosis.
作者 夏振营 吴丹 于建安 李思远 宋文艳 XIA Zhenying;WU Dan;YU Jianan;LI Siyuan;SONG Wenyan(Department of Radiology,Beijing Youan Hospital,Capital Medical University,Beijing 100069,China)
出处 《CT理论与应用研究》 2019年第2期221-228,共8页 Computerized Tomography Theory and Applications
关键词 X线计算机 噪声指数 卡氏肺孢子虫肺炎 图像质量 X-ray computed noise index PCP Image quality
作者简介 夏振营(1979-),男,硕士,首都医科大学附属北京佑安医院放射科主管技师,主要从事CT扫描、重建、技术质控等工作,Tel:010-83997357,E-mail:15801464158@163.com;通讯作者:宋文艳(1970-),女,首都医科大学附属北京佑安医院放射科主任医师,主要从事传染病影像学研究,Tel:010-83997369,E-mail:13611096669@163.com。
  • 相关文献

参考文献9

二级参考文献132

共引文献139

投稿分析

相关作者

内容加载中请稍等...

相关机构

内容加载中请稍等...

相关主题

内容加载中请稍等...

浏览历史

内容加载中请稍等...
;
使用帮助 返回顶部 意见反馈