iDose4迭代重建技术在腰椎外伤CT低剂量扫描中的应用

IDose4 iterative reconstruction technique in the application of the traumatic lumbar low dose CT scanning

目的 探讨i Dose4迭代重建技术在外伤腰椎CT扫描中降低辐射剂量的能力。方法 采用256层螺旋CT,选取51例急诊腰椎外伤行CT扫描的患者,随机分为4组,常规剂量组120 k V 300 m As,低剂量组分为120 k V 100 m As组、100 k V 200 m As组、100 k V 100 m As,获得的原始数据分别用FBP（滤波反投影）、i Dose4（Level1-6）迭代重建进行后重建。采用完全随机设计的方差分析及秩和检验（Kruskal Wallis）对结果进行比较。结果 相同扫描剂量下,与FBP相比,i Dose迭代重建能明显提高图像质量、降低噪声,差异有统计学意义（P〈0.05）;当扫描剂量降低时,图像噪声增加、图像质量下降,i Dose4迭代重建后,图像能达到诊断要求,且剂量降低60.2%-80.2%;相同扫描剂量下,i Dose组较FBP组降低辐射剂量约8.7%-46.3%。结论 i Dose4迭代重建技术能在明显降低辐射剂量的前提下,仍能保证优良的图像质量。

Objective To discuss iDose4 iterative reconstruction technique in lumbar injury and reduce the radiation close in CT scan. Methods 51 cases of emergency lumbar trauma patients with 256 layer spiral CT scan were choosed and randomly divided into 4 groups： routine dose group ：120 kV 300 mAs,three low dose group ：120 kV 100 mAs ,100 kV 200 mAs,100 kV 100 mAs. The raw data obtained respectively with FBP （filter back projection） ,iDose4 （Levell -6） iterative reconstruction after reconstruction. To analysis the results by adopted completely random design and rank test （Kruskal Wallis） . Results Under the same scan doses,, comparing with FBP, iDose iterative reconstruction has significantly different in improving the image quality, reducing the noise and radiation dose. The image noise and image quality decreased when scanning close reduced. By iDose4 iterative reconstruction, the image can meet the requirements of diagnosis and the scan dose decrease. Conclusions IDose4 iterative reconstruction technique can significantly decrease the dose of radiation, and ensure good image quality .