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

发布时间：2018-07-10 04:11

本文选题：体层摄影术 + X线计算机　；参考：《首都医科大学学报》2017年04期

【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 m As不变的情况下,对实验猪分别以管电压80 k V,常规滤波反投影(filtered back projection,FBP)重组;管电压120 k V,常规滤波反投影(filtered back projection,FBP)重组;管电压80 k V,扫描图像进行迭代算法(i Dose4)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 k V迭代算法重组的图像与120 k V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(P0.05),但辐射剂量降低71%。结论采用低剂量80 k V 60 m As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。
[Abstract]:Objective to study the feasibility of low-dose spiral CT scanning in urinary tract secretion phase of young pigs. Methods five young pigs were selected and reconstructed using Philips brilliant 256 slice spiral CT machine with 60m as fixed, respectively, with a tube voltage of 80 kV and a conventional filter backprojection (filtered back project. The voltage of the tube is 120kV, the conventional filter backprojection (filtered back project is reorganized, the voltage of the tube is 80kV, the scan image is reconstructed by iterative algorithm (I Dose4), the image will be read by two doctors by double blind method, and the score will be 4 points system. The quality of the three groups of images was evaluated, and the contrast noise ratio (contrast-to-noise) and CT dose index (CT dose) of the images in the secretory phase of urinary tract of the experimental animals were measured, and the differences of the image quality scores between the three groups were compared. Results there was no significant difference in CNR and image quality score between the reconstructed image with 80 kV tube voltage and 120kV conventional filtered backprojection image (P0.05), but the radiation dose was reduced by 71%. Conclusion the low dose 80 kV 60 m as complex iterative algorithm can be used to scan young pigs in secretory phase with spiral CT scan. The image quality can meet the diagnostic requirements, while the radiation dose decreases significantly.
【作者单位】：青岛大学附属医院放射科;
【分类号】：R814

【相似文献】