基于模型的迭代重建算法应用于80kV低剂量儿童胸部CT的可行性

发布时间：2018-06-30 06:35

本文选题：体层摄影术 + X线计算机　；参考：《中国医学影像技术》2017年04期

【摘要】：目的评价基于模型的迭代重建算法(MBIR)应用于80kV低剂量儿童胸部CT检查的可行性。方法收集44例因脊柱侧弯治疗后复查的患儿资料,所有患儿接受脊柱CT检查,扫描电压80kV,固定管电流50mA。对所得胸部图像采用MBIR重建(观察组)。所有患儿术前脊柱CT检查,扫描管电压120kV,对所得胸部图像采用滤波反射投影(FBP)重建(对照组)。两组图像质量主观评价由2名医师采用1~3分制,评价图像主观噪声及肺组织图像质量;图像质量客观评价为测量左心室最大层面的肺野、背部肌肉的噪声值,并计算肺野的SNR及CNR。并记录两次检查的容积CT剂量指数(CTDIvol)。结果观察组主观噪声评分明显高于对照组(P0.05)。观察组较对照组肺野噪声降低40.36%,SNR提高72.37%,CNR提高78.69%,CTDIvol降低66.52%,两组差异均有统计学意义(P均0.001)。结论 80kV低剂量儿童胸部CT可以满足诊断要求。
[Abstract]:Objective to evaluate the feasibility of model-based iterative reconstruction (MBIR) in 80 kV low dose children with chest CT. Methods the data of 44 children with scoliosis were collected. All the children were examined by CT scan voltage 80 kV fixed tube current 50 Ma. The chest images were reconstructed by MBIR (observation group). All the children were examined by CT before operation and the voltage of scanning tube was 120 kV. The chest images were reconstructed by filtering reflection projection (FBP) (control group). The subjective evaluation of image quality was conducted by two physicians to evaluate the subjective noise of the image and the image quality of the lung tissue, and the objective evaluation of the image quality was to measure the noise value of the lung field and the back muscle in the largest level of the left ventricle. The SNR and CNR of lung field were calculated. Volume CT dose index (CTDIvol) was recorded. Results the subjective noise score in the observation group was significantly higher than that in the control group (P0.05). Compared with the control group, the lung field noise in the observation group was decreased by 40.36% and the SNR was increased by 72.37. The CNR was increased by 78.69 and CTDIvol was decreased by 66.52%, and there was significant difference between the two groups (P 0.001). Conclusion 80 kV low dose child chest CT can meet the diagnostic requirements.
【作者单位】：首都医科大学附属北京儿童医院影像中心;首都医科大学附属北京儿童医院骨科;
【基金】：北京儿童医院苗圃项目(BCHYIPB-2016-06)
【分类号】：R816.92

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