| 李莹,艾娜娜,张颖颖,付玉存,蒋炯,牛丹丹,翟艳慧,贾守强.前置自适应统计迭代重建技术对体模肺纯磨玻璃结节图像质量及辐射剂量的影响[J].中国医学影像技术,2018,34(5):775~778 |
| 前置自适应统计迭代重建技术对体模肺纯磨玻璃结节图像质量及辐射剂量的影响 |
| Impact of prescribed adaptive statistical iterative reconstruction-V on image quality and radiation dosage of lung pure ground glass nodules: A phantom study |
| 投稿时间：2017-08-14 修订日期：2018-03-05 |
| DOI：10.13929/j.1003-3289.201708090 |
| 中文关键词: 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 |
| 英文关键词:Tomography, X-ray computed Noise Image quality Radiation dosage Adaptive statistical iterative reconstruction |
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| 中文摘要: |
| 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7.40 mSv、5.16 mSv、3.36 mSv、1.97 mSv、0.97 mSv和0.33 mSv，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 Pre-ASiR-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。 |
| 英文摘要: |
| 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 Pre-ASiR-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. |
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