噪声指数在学龄前儿童胸部低剂量CT扫描中的应用

发布时间：2018-07-16 12:52

【摘要】：目的探讨噪声指数在儿童胸部低剂量CT扫描的应用价值。方法选取0~1岁、1~3岁、3~6岁胸部CT检查患儿各200名,每年龄段随机分为10组,每组20名,预设噪声指数范围为9~18,均采用Z轴自动管电流调节技术,管电压100 kV,管电流20~200 mA,FBP重建,比较分析不同噪声指数条件下影像信噪比、影像噪声、CTDI_(vol)、DLP、ED等,并对影像质量进行评价,寻找满足诊断要求各年龄段患儿的最适噪声指数。结果 0~1岁噪声指数范围在9~12时,1~3岁噪声指数范围在9~15时,3~6岁噪声指数范围在9~17时扫描重建的影像质量满足诊断要求;各年龄段患儿随噪声指数增大其信噪比、CTDI_(vol)、DLP、ED等值减小,图像噪声增大。结论 0~1岁、1~3岁、3~6岁的患儿采用噪声指数分别为12、15、17时所扫描重建的图像既可满足诊断需求,又可显著降低患儿单次辐射剂量。
[Abstract]:Objective to evaluate the value of noise index in low-dose CT scanning of children's chest. Methods A total of 200 children aged from 0 to 1 and 3 years old from 3 to 6 years of age were selected and randomly divided into 10 groups with 20 in each group. The preset noise index ranged from 9 to 18. All of them were reconstructed by Z-axis automatic tube current regulation technique. The voltage of the tube was 100 kV, and the current of the tube was 20 ~ 200 mABP. The image signal-to-noise ratio (SNR), image noise (CTDI _ (vol) DLP Ed and so on under different noise indices were compared and analyzed, and the image quality was evaluated to find the most suitable noise index for children of different age groups. Results the range of noise index of 0 ~ 1 year old was from 9 to 12:00 and the range of noise index of 3 years was from 9 to 15:00. The imaging quality of the reconstructed image with the noise index range of 9 ~ 17:00 met the diagnostic requirements, and the signal-to-noise ratio (SNR) of children of all ages decreased with the increase of the noise index. Image noise increases. Conclusion the noise index of the children aged 0 to 1 and 3 years old and 3 to 6 years old were 12 ~ 15, respectively. The reconstructed images scanned at 17:00 could not only meet the diagnostic needs, but also significantly reduce the single dose of radiation.
【作者单位】：重庆医科大学附属儿童医院放射科儿童发育疾病研究教育部重点实验室儿科学重庆市重点实验室重庆市儿童发育重大疾病诊治与预防国际科技合作基地;
【分类号】：R816.92

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