吉林大学学报(医学版) ›› 2017, Vol. 43 ›› Issue (01): 159-163.doi: 10.13481/j.1671-587x.20170132

• 影像学 • 上一篇    下一篇

iDose4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

弓婷婷, 韩雪立, 韩津梁, 袁庆海   

  1. 吉林大学第二医院放射线科, 吉林 长春 130041
  • 收稿日期:2016-06-23 出版日期:2017-01-28 发布日期:2017-02-08
  • 通讯作者: 韩雪立,教授,硕士研究生导师(Tel:0431-88796996,E-mail:hanxueli6613@sina.cn) E-mail:hanxueli6613@sina.cn
  • 作者简介:弓婷婷(1983-),女,山西省吕梁市人,主治医师,医学硕士,主要从事心脏冠状动脉CT成像方面的研究。
  • 基金资助:

    吉林省科技厅自然科学基金资助课题(20130413006GH)

Application of iDose4 iterative reconstruction technique and filtered back projection technique in CT imaging of coronary artery

GONG Tingting, HAN Xueli, HAN Jinliang, YUAN Qinghai   

  1. Department of Radiology, Second Hospital, Jilin University, Changchun 130041, China
  • Received:2016-06-23 Online:2017-01-28 Published:2017-02-08

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120 kV管电压并分别采用滤波反投影技术(FBP-120 kV组)和iDose4迭代技术重建(iDose4-120 kV组);另一组采用100 kV管电压和iDose4迭代技术重建(iDose4-100 kV组)。将FBP-120 kV组的图像质量分别与iDose4-120 kV组及iDose4-100 kV组进行比较,并比较FBP-120 kV组和iDose4-100kV组的射线剂量。结果:图像质量主观评价中,FBP-120 kV组图像质量评分均值为(3.29±0.61)分,iDose4-120 kV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);iDose4-100 kV组图像质量评分均值为(3.21±0.43)分,与FBP-120 kV组比较差异无统计学意义(t=0.58,P=0.58)。iDose4-120 kV组信号噪声比(SNR)及对比度噪声比(CNR)均高于FBP-120 kV组(P<0.05);iDose4-100 kV组SNR及CNR均低于FBP-120 kV组,但差异无统计学意义(P>0.05)。iDose4-100kV组有效剂量(ED)明显低于FBP-120 kV组(P<0.001)。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。

关键词: 辐射, 图像质量, 电子计算机断层扫描, 冠脉血管, 重建技术

Abstract:

Objective: To dissuss the feasibility of the application of iDose4 to improve image quality and reduce the radiation dose in coronary artery CT angiography(CCTA)compared with traditional filter back-projection(FBP).Methods: A total of 60 patients under went 256-slice spiral CT coronary angiography were randomly divided into two groups, 30 cases in each group. In one group 120 kV tube voltage was used,and FBP (FBP-120 kV group) and iDose4 (iDose4-120 kV group) reconstruction were performed. In another group, 100 kV tube voltage and iDose4 technique reconstruction(iDose4-100 kV group) were used. The image quality in FBP-120 kV group compared with iDose4-120 kV group and iDose4-100kV group.The radiation doses in FBP-120 kV and iDose4-100 kV groups were also compared.Results: The average score of image quality in FBP-120 kV group was (3.29±0.61) points, and was (3.43±0.51) points in iDose4-120 kV,there was no significant difference between them (t=-1.47, P=0.17).The mean image quality score in iDose4-100 kV group was(3.21±0.43)points, and threre was no statistical difference compared with FBP-120 kV group(t=0.58,P=0.58). The signal to noise ratio(SNR) and contrast to noise ratio(CNR) in iDose4-120 kV group were higher than those in FBP-120 kV group(P<0.01). The SNR and CNR in iDose4-100 kV group had no significant differences compared with FBP-120 kV group (P>0.15). The effective dose in iDose4-100 kV group was significantly lower than that in FBP-120 kV group (P<0.001).Conclusion: In CT imaging of coronary artery, compared with FBP, iDose4 technology can improve the quality of image and appropriately reduce the tube voltage under the condition of guaranting the quality of image,and it can reduce the radiation dose.

Key words: radiation, image quality, computed tomography, coronary angiography, reconstruction technique

中图分类号: 

  • R814.42