基于胸部CT常规平扫与虚拟平扫图像质量及钙化检出的对照研究  

A comparative study of image quality and calcification detection rate between conventional and virtual unenhanced chest CT scans

作　　者：王新辉[1] 孙丽红[1] 舒建军[1] 张剑[1] WANG Xinhui;SUN Lihong;SHU Jianjun;ZHANG Jian(Radiology department,The First Peoples Hospital of Shizuishan,Shizuishan 753200,China)

机构地区：[1]宁夏石嘴山市第一人民医院放射科

出　　处：《宁夏医学杂志》2019年第12期1070-1072,共3页Ningxia Medical Journal

基　　金：宁夏医科大学校级面上项目(XM2018190)

摘　　要：目的探讨Revolution 256排宽体探测器能谱CT胸部成像中虚拟平扫(VUE)替代常规平扫的可行性。方法收集100例患者使用Revolution 256排16 cm宽体探测器能谱CT行胸部常规平扫及能谱增强扫描(动脉期、静脉期),后处理得到不同时期VUE图像(动脉期VUE、静脉期VUE),比较常规平扫与动静脉期VUE背景噪声(SD)、信号噪声比(SNR)、主观评价及钙化检出率(纵膈4、5、6、7、10区淋巴结)。3组图像的SD、SNR比较采用单因素方差分析,图像质量主观评分比较采用秩和检验。结果常规平扫、动脉期VUE、静脉期VUE的3组图像SD比较,差异有统计学意义(P<0.05);组间比较常规平扫与动脉期及静脉期VUE图差异无统计学意义(P>0.05)。3组图像SNR比较差异有统计学意义(P<0.05);组间比较常规平扫与动脉期、静脉期VUE图差异无统计学意义(P>0.05)。主观评分差异有统计学意义(P<0.05),在VUE图像中,以静脉期VUE主观评分最高;以常规平扫为基准,动脉期与静脉期VUE钙化检出率分别为59.1%和67.1%。结论 VUE图像质量可以替代常规平扫,以静脉期VUE效果最佳,从而有效地降低患者辐射剂量,缺点是钙化检出率低,可在需要多次复查的患者中推广使用。Objective To explore the feasibility of replacing conventional plain scan with virtual unenhanced plain scan(VUE) in Revolution 256-row wide body detector energy spectrum CT chest imaging.Methods One hundred patients detected by plain CT scan underwent the contrast enhanced CT scans in arterial phase(AP) and venous phase(VP) with spectral imaging. VUE images of different phases(arterial VUE and delayed VUE) were obtained during post-processing of image. CT value,background noise(SD),subjective image quality and calcification detection rate(lymph nodes in the 4,5,6,7 and 10 area of mediastinum) were compared between the plain CT scan and the virtual unenhanced CT. One-way AVOVA was used to analysis the difference between these groups.Results There was significant difference in SD between plain CT and VUE(P<0.05). Significant differences in SNR were observed between routine CT scan,arterial VUE and delayed VUE. The highest subjective image quality appeared at delayed VUE. The calcification detection in Arterial VUE and delayed VUE were 59.1%and 67.1%.Conclusion The plain CT scan can be substituted with VUE,which effectively reduces the radiation dose but has a low calcification detection rate. VUE can be popularized in the patients who require multiple CT examinations.

关 键 词：CT 常规平扫 虚拟平扫VUE 动脉期 静脉期 

分 类 号：R445.3[医药卫生—影像医学与核医学]