摘要
目的分析高分辨率Revolution CT不同权重前置自适应统计迭代重建技术(Pre-ASiR-V)对仿真胸部体模中肺纯磨玻璃结节(pGGN)图像质量及辐射剂量的影响,以寻找最佳Pre-ASiR-V权重。方法采用Revolution CT对含有4个pGGN的仿真胸部体模进行扫描,Pre-ASiR-V权重分别设置为0、20%、40%、60%、80%和100%,记录并比较不同Pre-ASiR-V权重图像的平均噪声、有效辐射剂量(ED)和pGGN图像质量的主观评分。结果Pre-ASiR-V权重为0、20%、40%、60%、80%和100%的图像平均噪声分别为(17.93±2.20)HU、(17.30±3.68)HU、(18.20±3.44)HU、(18.80±0.20)HU、(19.87±2.56)HU和(15.90±4.56)HU,差异无统计学意义(F=0.568,P=0.723);ED分别为7.40mSv、5.16mSv、3.36mSv、1.97mSv、0.97mSv和0.33mSv,与Pre-ASiR-V为0的图像比较,随着Pre-ASiR-V升高,ED分别降低30.27%、54.59%、73.38%、86.89%、95.54%。2名医师对pGGN图像的主观评分一致性较好(Kappa=0.778,P=0.003),评分均≥3分。Pre-ASiR-V权重为80%及100%时,图像的主观评分略低。结论PreASiR-V权重对仿真胸部体模高分辨率图像的噪声影响较小,但可显著降低辐射剂量;Pre-ASiR-V权重60%为最佳选择。
Objective To investigate the impact of prescribed adaptive statistical iterative reconstruction V（Pre-ASiR-V）on imaging quality and radiation dosage of pure ground glass nodules（pGGN）in chest phantom,in order to obtain the optimal level of Pre-ASiR-V.Methods CT scanning for a chest phantom containing 4 artificial pGGNs was performed with Revolution CT,and the Pre-ASiR-V level was set as 0,20%,40%,60%,80%and 100% group,respectively.The mean noise,effective dose（ED）and the subjective scores of pGGN imaging were recorded and compared.Results The mean noise of groups（Pre-ASiR-V 0,20%,40%,60%,80% and 100%）was（17.93±2.20）HU,（17.30±3.68）HU,（18.20±3.44）HU,（18.80±0.20）HU,（19.87±2.56）HU and（15.90±4.56）HU,respectively（F=0.568,P=0.723）.ED of these groups was 7.40 mSv,5.16 mSv,3.36 mSv,1.97 mSv,0.97 mSv and 0.33 mSv,respectively.Compared with imaging of PreASiR-V 0,the reduction percentage of ED was 30.27%,54.59%,73.38%,86.89%and 95.54%,respectively.The subjective score of the image quality evaluated by the 2 observers had high agreement（Kappa=0.778,P=0.003）,and all the scores were greater than 3.The subjective score of Pre-ASiR-V 80% and 100% group was slightly lower than those in other groups.Conclusion Different Pre-ASiR-V level slightly impacts the noise of high-resolution CT images of chest phantom,while reduces radiation dosage significantly.Pre-ASiR-V level of 60%is the optimal protocol.
作者
李莹
艾娜娜
张颖颖
付玉存
蒋炯
牛丹丹
翟艳慧
贾守强
LI Ying;AI Na＇na;ZHANG Yingying;FU Yucun;JIANG Jiong;NIU DANDan;ZHAI Yanhui;JIA Shouqiang(Department of Imaging, Laiwu Affiliated Hospital of Taishan Medical University, Laiwu 271199, China;Department of Imaging, Liaocheng People＇s Hospital, Liaocheng 252002, China;CT Research Centre GE China, Shanghai 201203, China)
出处
《中国医学影像技术》
CSCD
北大核心
2018年第5期775-778,共4页
Chinese Journal of Medical Imaging Technology
关键词
体层摄影术
X线计算机
噪声
图像质量
辐射剂量
自适应迭代重建
Tomography
X-ray computed
Noise
Image quality
Radiation dosage
Adaptive statistical iterative reconstruction
