炫速双源CT与普通双源CT头部血管双能量成像辐射剂量与图像质量的对比研究  

Comparative study on the image quality and the radiation dose of dual energy CT intracranial angiography with the first and second generation dual-source CT

作　　者：顾海峰[1] 周长圣[1] 李林[1] 王清清[1] 谢颖颖[1] 郑玲[1] 

机构地区：[1]南京军区南京总医院医学影像科,南京210002

出　　处：《医学研究生学报》2014年第5期502-506,共5页Journal of Medical Postgraduates

基　　金：南京军区南京总医院科研基金(20120504)

摘　　要：目的第2代炫速双源CT的推出在多种性能方面均有了较大提升。文中探讨炫速双源CT与普通双源CT在行头部血管双能量成像时的图像质量与辐射剂量之间的差异。方法选取临床疑似脑血管病变患者80例,并分为2组,每组40例。分别对2组患者使用普通双源CT及炫速双源CT行头颅血管双能量成像,并且同时对一台CT机日常检测用水模采用2组同样的扫描条件进行对比扫描,对所获数据进行辐射剂量的测量以及图像质量的主、客观评价,对其中包括容积CT剂量指数、患者脑血管CT值以及图像质量等指标进行对比。结果 2组在容积CT剂量指数CTDIvol、患者脑血管CT值以及患者图像质量的主观评分差异无统计学意义(P>0.05),但在剂量长度乘积DLP、有效剂量ED、图像噪声以及小脑岩部的射线硬化束伪影的主观评价差异有统计学意义(P<0.05)。结论头部血管双能量成像时,在扫描条件(kV、参考mAs)近似相同的条件下,炫速双源CT与普通双源CT相比患者所受的辐射剂量与图像噪声更低,但图像总体质量方面并无明显差别。Objective There are lots of promotions in the perfommance of the dual-source CT.This study is to assess the image quality and radiation dose of dual energy CT intracranial angiography with the first and second generation dual-source CT.Methods Select 80 patients who have suspected of intracranial vessels diseases randomly.They are divided into two groups A and B,each has 40 patients.Then the A and B groups underwent dual-energy intracranial CT angiography respectively use the first and second generation dual-source CT.At the same time,a CT water phantom is scanned by the same scanning parameters as the group A and B.Then evaluate the acquired data of image quality and radiation dose by subjective method and objective method.Finally,the obtained measurement data were statistically analyzed using the SPSS 11.5 software.In the objective evaluation of image quality,Independent-Samples T Test was applied for the patient radiation dose,the water phantom and patient image quality and the cerebrovascular CT values of the patient; In the subjective evaluation of image quality,Mann-Whitney Test were applied for the score of the image quality.Results The result of the A and B groups in the CTDIvol,the cerebrovascular CT values of the patients and the subjective image quality is P 〉0.05,the difference was not statistically significant,which means that no significant difference between the two groups in these aspect.But the result of the A and B groups in the DLP,the ED,the image noise and the x-ray beam hardening artifacts on subjective evaluation is P 〈 0.05,the difference was statistically significant,which means that there is a difference between the two groups.Conclusion When do the dual energy CT intracranial angiography,if the scanning conditions （kV,reference mAs） under approximately the same conditions,compared with the first generation dual-source CT the second generation dual-source CT radiation dose to the patient suffered lower and the image noise is also lower,but the overall image quality is no signific

关 键 词：炫速双源CT 普通双源CT 双能量成像 血管造影 图像质量 辐射剂量 图像噪声 

分 类 号：R445[医药卫生—影像医学与核医学]