首都医科大学学报 ›› 2017, Vol. 38 ›› Issue (4): 576-579.doi: 10.3969/j.issn.1006-7795.2017.04.017

• 基础研究 • 上一篇    下一篇

低管电压复合迭代算法CT扫描可行性研究:幼猪泌尿系分泌期图像质量和辐射剂量的实验分析

胡斌, 陈静静, 徐文坚, 徐琦, 李晓飞   

  1. 青岛大学附属医院放射科, 山东青岛 266003
  • 收稿日期:2017-04-23 出版日期:2017-07-21 发布日期:2017-07-20
  • 通讯作者: 徐文坚 E-mail:hubin732012@163.com

Feasibility study of low tube voltage and hybrid iterative reconstruction algorithm at MSCT:Experimental analysis of evaluating radiation dose and image quality on excretory phase images of infant swine urography

Hu Bin, Chen Jingjing, Xu Wenjian, Xu Qi, Li Xiaofei   

  1. Department of Radiology, The Affiliated Hospital of Qingdao University, Qingdao 266003, Shandong Province, China
  • Received:2017-04-23 Online:2017-07-21 Published:2017-07-20

摘要: 目的 以幼猪泌尿系模拟幼儿泌尿系,探求幼儿泌尿系分泌期低剂量螺旋CT扫描的可行性。方法 选取幼猪5只,采用荷兰Philips Brilliance 256层螺旋CT机在固定60 mAs不变的情况下,对实验猪分别以管电压80 kV,常规滤波反投影(filtered back projection,FBP)重组;管电压120 kV,常规滤波反投影(filtered back projection,FBP)重组;管电压80 kV,扫描图像进行迭代算法(iDose4)重组,将获得图像由2名医师进行双盲法阅片,使用4分制评分,对3组图像的清晰度进行质量评分,并测量实验动物尿路分泌期图像的对比噪声比(contrast-to-noise ratio,CNR)和CT剂量指数(CT dose index,CTDI),比较各组间图像质量评分、CNR及CTDI的差异性。结果 管电压80 kV迭代算法重组的图像与120 kV常规滤波反投影的图像的CNR和图像质量评分差异无统计学意义(P>0.05),但辐射剂量降低71%。结论 采用低剂量80 kV 60 mAs复合迭代算法对幼猪分泌期进行螺旋CT扫描,图像质量能够满足诊断要求,而辐射剂量大幅下降。

关键词: 体层摄影术, X线计算机, 辐射剂量

Abstract: Objective To optimize the scanning parameters for CT with lower radiation dose on the infant pigs' urinary which mimicks the baby's urinary of human being.Methods Five pigs were undertaken CT scan with the conventional 120 kV,80 kV and 80 kV with a hybrid iterative reconstruction algorithm. The estimated effective radiation of each protocol was compared with via the student t test. Scores and the contrast-to-noise-ratio(CNR)of the 120 kV,80 kV,and hybrid iterative reconstructed 80 kV images were evaluated. Results The effective radiation was 71% lower during CT excretory phase scanning with the 80 kV protocol than with the 120 kV protocol. There was no significant difference in the CNR of any of the regions of interest between 80 kV with iterative reconstruction and 120 kV(P>0.05). There was no significant difference in the quality of images obtained from the conventional 120 kV scanning and low dose group of 80 kV with iterative reconstruction scanning images.Conclusion A low tube voltage and the hybrid iterative reconstruction algorithm can dramatically decrease radiation with adequate image quality in normal infant pigs' uninary excretory phase scanning.

Key words: tomography, X-ray computed, radiation dosage

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