| 冉姗姗,綦维维,张淼,张卓璐,陈雷,洪楠.多参数设置对低剂量胸部CT扫描图像质量及辐射剂量的影响[J].中国医学影像技术,2018,34(1):113~117 |
| 多参数设置对低剂量胸部CT扫描图像质量及辐射剂量的影响 |
| Impact of multiple parameters setting on image quality and radiation dose in low-dose chest CT scanning |
| 投稿时间：2016-04-10 修订日期：2017-11-16 |
| DOI：10.13929/j.1003-3289.201704039 |
| 中文关键词: 胸部 体层摄影术,X线计算机 辐射剂量 图像质量 |
| 英文关键词:Chest Tomography,X-ray computed Radiation dosage Image quality |
| 基金项目:北京市科委早期肺癌筛查项目（D141100000214006）。 |
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| 中文摘要: |
| 目的 探讨当iCT管电流设置为17 mAs时，其他参数设置对低剂量胸部CT扫描图像质量及辐射剂量的影响。方法 选取低剂量胸部CT筛查的200名志愿者，设定管电流为17 mAs，根据管电压及自动曝光控制（DoseRight）设置分为4组：A组为120 kV，DoseRight扫描；B组为100 kV，DoseRight扫描；C组为120 kV，固定管电流扫描；D组为100 kV，固定管电流扫描。对所有扫描图像分别采用混合迭代重建（iDose4）和全模型迭代重建（IMR）进行肺窗及纵隔窗算法重建。比较4组的有效剂量及图像质量。结果 4组肺窗、纵隔窗的iDose4、IMR重建图像质量评分及有效剂量差异均有统计学意义；A、B组图像质量均较C组图像质量好（P均<0.05），与其余3组比较D组图像质量最差（P均<0.05）；C组纵隔窗及D组肺窗、纵隔窗的iDose4重建图像质量评分较低；A、B、C、D组SNR值依次降低（P均<0.01）；A组有效剂量最高（P均<0.01），D组有效剂量最低（P均<0.01），B组和C组间有效剂量差异无统计学意义（P=0.055）。结论 iCT管电流为17 mAs时，采用100 kV管电压、DoseRight扫描及IMR重建方式可获得较满意的图像质量和较低的辐射剂量。 |
| 英文摘要: |
| Objective To investigate the impact of parameters setting on image quality and radiation dose of low-dose chest CT scanning when iCT tube current was set as 17 mAs.Methods Two hundred volunteers who accepted low-dose chest CT screening with tube current was set as 17 mAs were randomly divided into four groups according to the tube voltage and automatic exposure control (DoseRight) settings (group A:120 kV, DoseRight; group B:100 kV, DoseRight; group C:120 kV, fixed tube current; group D:100 kV, fixed tube current). Then hybrid iterative reconstruction (HIR:iDose4) and iterative model reconstruction (IMR) were performed on all scanned images of lung and mediastinal window algorithm, respectively. The effective dose and image quality of 4 groups were compared.Results There were significant differences of image quality score and effective dose among 4 groups. The image quality of group A and B were better than that of group C (P<0.05), and of group D was the worst compared with the other three groups (P<0.05). Image quality scores of the mediastinal window of group C and D and the lung window of group D at iDose4 reconstruction were lower. SNR value of group A, B, C, D decreased in order (P<0.01). Group A had the highest effective dose (P<0.01), while the effective dose of group B and group C had no significant difference (P=0.055), and group D had the lowest effective dose (P<0.01).Conclusion When tube current was set as 17mAs at iCT, selecting 100 kV tube voltage, DoseRight and IMR reconstruction arithmetic can obtain satisfactory image quality and low radiation dose. |
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