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Imaging pediatric acute head trauma using 100-kVp low dose CT with adaptive statistical iterative reconstruction (ASIR-V) in single rotation on a 16 cm wide-detector CT
Journal of X-Ray Science and Technology ( IF 3 ) Pub Date : 2021-04-01 , DOI: 10.3233/xst-210856
Yanan Zhu 1 , Zhian Pi 1 , Heping Zhou 1 , Zhengjun Li 1 , Faqing Lei 1 , Jianjun Hui 2 , Ximeng Zhang 1 , Juanping Xie 3 , Yukun Liang 1
Affiliation  

OBJECTIVE:To demonstrate the ability of achieving low dose and high-quality head CT images for children with acute head trauma using 100 kVp and adaptive statistical iterative reconstruction (ASIR-V) algorithm in single rotation on a 16 cm wide-detector system. MATERIALS AND METHODS:We retrospectively analyzed the CT dose index (CTDI) and image quality of 104 children aged 0–6 years with acute head trauma (1 hour –3 days) in two groups: Group 1(n = 50) on a 256-row CT with single rotation at a reduced-dose of 100 kVp/240 mA and reconstructed using ASIR-V at 70%level; Group 2(n = 54) on a 64-row CT with multiple rotations at a standard dose of 120 kVp/ 180mA and reconstructed using a conventional filtered back-projection (FBP). Both groups used the 0.5 s/r axial scan mode. CT dose index (CTDI) and quantitative image quality measurements were compared using the Student t test; qualitative image quality comparison was carried out using Mann-Whitney rank test and the inter-reviewer agreement was evaluated using Kappa test. RESULTS:The exposure time was 0.5 s for Group 1 and 3.27±0.29 s for Group 2. The CTDI in Group 1 was 9.74±0.86mGy, 36.38%lower than the 15.31mGy in Group 2 (p < 0.001). Group 1 and Group 2 had similar artifact index (2.06±1.06 vs. 2.37±1.18) in the cerebellar hemispheres, and similar contrast-to-noise ratio (2.32±0.83 vs. 1.69±0.68), (1.47±0.72 vs. 1.10±0.43) respectively for cerebellum and thalamus (p > 0.05). Image quality was acceptable for diagnosis, and motion artifacts were reduced in Group 1 (p < 0.001). CONCLUSION:Single rotation CT with 100 kVp and 70%ASIR-V on 16 cm wide-detector CT reduces radiation dose and motion artifacts for children with acute head trauma without compromising diagnostic quality as compared with standard dose protocol. Thus, it provides a novel imaging method in management of pediatric acute head trauma.

中文翻译:

使用 100 kVp 低剂量 CT 和自适应统计迭代重建 (ASIR-V) 在 16 cm 宽探测器 CT 上单次旋转对儿童急性头部外伤进行成像

目的:证明在 16 cm 宽探测器系统上使用 100 kVp 和自适应统计迭代重建 (ASIR-V) 算法在单次旋转中为急性头部外伤儿童获得低剂量和高质量头部 CT 图像的能力。材料与方法:我们回顾性分析了两组 104 名 0-6 岁儿童急性头部外伤(1 小时-3 天)的 CT 剂量指数(CTDI)和图像质量:第 1 组(n = 50)在 256 -行 CT 以 100 kVp/240 mA 的降低剂量进行单次旋转,并使用 ASIR-V 以 70% 的水平重建;第 2 组(n = 54)在 64 排 CT 上以 120 kVp/180mA 的标准剂量多次旋转,并使用传统的滤波反投影 (FBP) 重建。两组均使用 0.5 s/r 轴向扫描模式。使用 Student t 检验比较 CT 剂量指数 (CTDI) 和定量图像质量测量值;使用 Mann-Whitney 秩检验进行定性图像质量比较,使用 Kappa 检验评估审稿人之间的一致性。结果:第1组暴露时间为0.5 s,第2组为3.27±0.29 s。第1组的CTDI为9.74±0.86mGy,比第2组的15.31mGy低36.38%(p < 0.001)。第 1 组和第 2 组在小脑半球具有相似的伪影指数(2.06±1.06 vs. 2.37±1.18),以及相似的对比度噪声比(2.32±0.83 vs. 1.69±0.68),(1.47±0.72 vs. 1.10) ±0.43) 分别为小脑和丘脑 (p > 0.05)。图像质量对于诊断来说是可以接受的,并且第 1 组的运动伪影减少(p < 0.001)。结论:与标准剂量方案相比,在 16 cm 宽探测器 CT 上具有 100 kVp 和 70%ASIR-V 的单旋转 CT 可减少急性头部外伤儿童的辐射剂量和运动伪影,而不会影响诊断质量。因此,它为小儿急性头部外伤的管理提供了一种新的成像方法。
更新日期:2021-04-04
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