iDose~4迭代重建技术和滤波反投影技术在冠状动脉CT成像中的应用

发布时间：2018-08-07 11:47

【摘要】：目的:探讨在冠状动脉CT成像中,与传统的滤波反投影技术(FBP)比较,应用iDose4迭代技术提高图像质量和降低辐射剂量的可行性。方法:将60例接受256层螺旋CT冠状动脉成像的患者随机分成2组,每组30例,一组采用120kV管电压并分别采用滤波反投影技术(FBP-120kV组)和iDose4迭代技术重建(iDose4-120kV组);另一组采用100kV管电压和iDose4迭代技术重建(iDose4-100kV组)。将FBP-120kV组的图像质量分别与iDose4-120kV组及iDose4-100kV组进行比较,并比较FBP-120kV组和iDose4-100kV组的射线剂量。结果:图像质量主观评价中,FBP-120kV组图像质量评分均值为(3.29±0.61)分,iDose4-120kV组为(3.43±0.51)分,组间比较差异无统计学意义(t=-1.47,P=0.17);iDose4-100kV组图像质量评分均值为(3.21±0.43)分,与FBP-120kV组比较差异无统计学意义(t=0.58,P=0.58)。iDose4-120kV组信号噪声比(SNR)及对比度噪声比(CNR)均高于FBP-120kV组(P0.05);iDose4-100kV组SNR及CNR均低于FBP-120kV组,但差异无统计学意义(P0.05)。iDose4-100kV组有效剂量(ED)明显低于FBP-120kV组(P0.001)。结论:冠状动脉CT成像中,与滤波反投影技术比较,采用iDose4迭代重建技术可以提高图像质量,且在保证图像质量不变的情况下适当降低管电压可降低射线剂量。
[Abstract]:Objective: to investigate the feasibility of using iDose4 iterative technique to improve image quality and reduce radiation dose in coronary artery CT imaging, compared with conventional filtering backprojection technique (FBP). Methods: 60 patients undergoing 256-slice spiral CT coronary angiography were randomly divided into two groups, 30 patients in each group. One group uses 120kV voltage and uses filter backprojection technique (FBP-120kV group) and iDose4 iterative technique (iDose4-120kV group), the other group uses 100kV tube voltage and iDose4 iterative technique (iDose4-100kV group). The image quality of FBP-120kV group was compared with that of iDose4-120kV group and iDose4-100kV group, and the radiation doses of FBP-120kV group and iDose4-100kV group were compared. Results: in subjective evaluation of image quality, the average image quality score of FBP-120kV group was (3.29 卤0.61) and that of iDose 4-120kV group was (3.43 卤0.51), and there was no significant difference between the two groups (t = 1.47, P ~ (0.17), and the mean value of image quality score of iDose 4-100 kV group was (3.21 卤0.43). Compared with FBP-120kV group, there was no significant difference (t0. 58). The ratio of signal noise to (SNR) and contrast noise ratio to (CNR) in iDose 4-120 kV group were higher than those in FBP-120kV group (P0.05), SNR and CNR in iDose 4-100 kV group were lower than those in FBP-120kV group, but the difference was not statistically significant (P0.05). The effective dose (ED) of iDose 4-100 kV group was significantly lower than that of FBP-120kV group (P0. 001). Conclusion: compared with filtered backprojection technique, iDose4 iterative reconstruction technique can improve image quality in coronary artery CT imaging, and the dose of radiation can be reduced by properly reducing the tube voltage under the condition that the image quality is not changed.
【作者单位】：吉林大学第二医院放射线科;
【基金】：吉林省科技厅自然科学基金资助课题(20130413006GH)
【分类号】：R816.2

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