| 颜利辉,陈飞,姚立正,李新.前置自适应统计迭代重建技术对胸部CT辐射剂量和图像质量的影响:体模与临床研究[J].中国医学影像技术,2017,33(3):468~472 |
| 前置自适应统计迭代重建技术对胸部CT辐射剂量和图像质量的影响:体模与临床研究 |
| Impact of pre-setted adaptive statistical iterative reconstruction Veo on radiation dose and image quality of chest CT scanning: Chest model and clinical study |
| 投稿时间：2016-11-10 修订日期：2017-01-15 |
| DOI：10.13929/j.1003-3289.201611063 |
| 中文关键词: 胸部 体层摄影术,X线计算机 基于多模型的自适应统计迭代重建 辐射剂量 图像质量 |
| 英文关键词:Chest Tomography, X-ray computed Adaptive statistical iterative reconstruction Veo Radiation dose Image quality |
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| 中文摘要: |
| 目的 探讨前置基于多模型的自适应统计迭代重建（ASiR-V）技术对胸部CT辐射剂量和图像质量的影响。方法 采用GE Revolution CT对胸部仿真体模和120例胸部CT平扫患者（分为6组，每组20例）分别设定前置ASiR-V权重为0、20%、40%、60%、80%、100%进行扫描。管电压120 kV，管电流采用自动毫安（Smart mA 10-500）技术，噪声指数设为11。记录胸部体模及各组患者扫描的剂量长度乘积，计算并比较各组有效剂量（ED）。以胸部体模不同组织结构（肺组织、脊柱旁软组织、主动脉和椎体）的CT值和标准差（SD）作为客观指标，结合对各组患者的图像主观评分，比较图像质量的组间差异。结果 随着前置ASiR-V权重的增加，体模及患者的ED均呈对数降低，体模不同组织CT值、图像噪声均未见明显改变。ASiR-V权重为40%时纵隔窗和肺窗的主观评分开始下降；60%时纵隔窗和肺窗图像主观评分相对40%时出现明显下降（P<0.05）。ASiR-V权重为40%，ED降至ASiR-V权重为0时的57.21%。结论 前置ASiR-V可以降低辐射剂量，同时又不影响图像客观指标；前置ASiR-V权重为40%时，图像仍可保证临床诊断需求，且辐射剂量明显降低，临床应用价值最高。 |
| 英文摘要: |
| Objective To explore the impact of pre-setted generation adaptive statistical iterative reconstruction Veo (ASiR-V) on chest CT radiation dose and image quality. Methods The chest model and 120 patients (divided into 6 groups, each n=20) were scanned by GE Revolution CT under the condition of pre-setted ASiR-V weights for 0, 20%, 40%, 60%, 80% and 100% respectively. The tube voltage was 120 kV, the tube current was automated mAs (Smart mA10-500) technology, the noise index was 11. The dose-length product of each chest model group and patients group were record, the effective dose (ED) of each group was calculated and compared. The image quality among groups through combining the objective CT and standard deviation (SD) values of different organizations (lung tissue, the soft tissue near by spine, the aorta and vertebral body) in chest model and the image subjective rating of patients were compared, and the subjective score of patients' images was also compared among groups. Results With the increase of pre-setted ASiR-V, the ED of chest model and patients reduced as a logarithmic fitting, there are no obvious changes of the CT value and image noise SD value of different organizations in model. The subjective score of mediastinal and pulmonary window was begin to decline at 40% weighted ASiR-V. The subjective score of mediastinal and pulmonary window descend obviously at 60% weighted ASiR-V compare to 40% (P<0.05). ED of pre-setted 40% weighted ASiR-V reduced to 57.21% compared to that of 0 weighted ASiR-V. Conclusion The pre-setted ASiR-V can reduce the radiation dose, and does not affect the objective image quality at the same time. The pre-setted 40% weighted ASiR-V has the highest clinical application value due to the radiation dose can be obviously reduced with ensuring the image quality, which can meet the demand of diagnosis. |
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