能谱CT冠状动脉造影单能量图像质量的优化

发布时间：2018-11-25 18:49

【摘要】：目的评估能谱CT冠状动脉造影中不同keV水平单能量图像的客观质量控制参数,确定最佳单能量图像。方法采用能谱CT机对100例受检者进行能谱CT冠状动脉造影,并分为正常组50例,病变组50例。对40~140keV间隔5keV的21组单能量图像噪声(Noise)进行测量,计算正常组和病变组前降支(LAD)、左旋支(LCx)及右冠状动脉(RCA)的SNR和CNR及病变组中242个斑块的CNR。采用单因素方差分析和独立样本t检验评估冠状动脉(LAD、LCx、RCA的近、中、远段)图像的Noise、SNR及CNR。结果单能量图像Noise下降趋势的分界值在60keV,正常组、病变组血管的SNR、CNR值均在40~70keV水平明显高于其他keV水平。60keV水平单能量图像的SNR、CNR值在正常组与病变组之间差异无统计学意义。结论对于正常组和病变组,60~70keV水平的单能量图像能够获得较高的SNR、CNR和较低的图像Noise,可作为能谱CT冠状动脉造影的最佳单能量水平。
[Abstract]:Objective to evaluate the objective quality control parameters of single energy images with different keV levels in CT coronary angiography and to determine the best single energy images. Methods Energy dispersive CT coronary arteriography was performed on 100 subjects with energy dispersive CT, and was divided into normal group (n = 50) and pathological group (n = 50). Single energy image noise (Noise) of 21 groups of 40~140keV septal 5keV was measured. SNR and CNR of left circumflex branch (LCx) and (RCA) of right coronary artery of anterior descending branch (LAD), and (RCA) of right coronary artery were calculated in normal group and pathological group, and CNR. of 242 plaques in lesion group were also calculated. Evaluation of Noise,SNR and CNR. of Coronary artery (LAD,LCx,RCA) Image by single Factor Analysis of Variance and Independent sample t Test Results the threshold of Noise descending trend in single energy image was 60 Kev. In normal group, the SNR,CNR value of vessel in pathological group was significantly higher than that in other keV level. SNR, of single energy image on 60keV level was significantly higher than that of other keV level. There was no significant difference in CNR between normal group and pathological group. Conclusion for normal group and pathological group, the single energy image of 60~70keV level can obtain higher SNR,CNR and lower image Noise, can be used as the best single energy level of CT coronary angiography.
【作者单位】：天津医科大学总医院放射科;天津理工大学计算机与通信工程学院;
【基金】：国家自然科学基金(81301217) 天津市应用基础及前沿技术研究计划(11JCZDJC15600) 国家临床重点专科建设项目
【分类号】：R816.2;TP391.41

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