256层iCT第4代混合迭代重建技术在胸部低剂量扫描中的应用评价

发布时间：2018-06-02 18:55

本文选题：计算机断层扫描 + 低剂量　；参考：《上海交通大学学报(医学版)》2016年05期

【摘要】：目的比较低剂量i CT、常规剂量i CT及64排常规剂量CT胸部扫描图像质量,探讨第4代混合迭代重建(iDOSE~4)技术在低剂量扫描中的应用价值。方法收集排除胸部病变的150名男性健康体检者的胸部螺旋CT扫描图像资料,分为256层iDOSE4低剂量组(iDOSE~4低剂量组,n=50)、256层iDOSE4常规剂量组(iDOSE4常规剂量组,n=50)、64排常规剂量组(n=50),对CT图像质量(肺纹理、纵隔大血管轮廓、支气管形态、腋窝淋巴结)进行评分和比较分析。结果在iDOSE4低剂量组与常规剂量组,2组间肺纹理、纵隔大血管轮廓、支气管形态等评分的差异无统计学意义(P=0.633,P=0.814,P=0.543),iDOSE4低剂量组腋窝淋巴结评分和4项总分低于常规剂量组(P=0.000,P=0.000);在iDOSE~4低剂量组与64排常规剂量组,2组间肺纹理、纵隔大血管轮廓、支气管形态评分的差异无统计学意义(P=0.466,P=0.820,P=0.377),iDOSE~4低剂量组腋窝淋巴结评分和4项总分低于64排常规剂量组(P=0.000,P=0.000);iDOSE~4常规剂量组与64排常规剂量组的CT图像质量无明显差异。各组辐射剂量值(CTDIvol)从高到低依此为64排常规剂量组(13.6 m Gy)、iDOSE~4常规剂量组(9.7m Gy)和iDOSE~4低剂量组(3.4 m Gy)。结论 256层i CT的iDOSE~4胸部低剂量扫描技术能获取可靠的图像质量,仅腋窝淋巴结显示能力略低于常规剂量,但能够显著减少辐射剂量。
[Abstract]:Objective to compare the image quality of low dose I CT, conventional dose I CT and 64 slice conventional dose CT, and to evaluate the value of the fourth generation hybrid iterative reconstruction of iDOSE4 in low dose CT. Methods the chest spiral CT images were collected from 150 healthy men who excluded chest lesions. The patients were divided into 256-layer iDOSE4 low-dose group and 256-layer iDOSE4 conventional dose group. The CT image quality (lung texture, mediastinal great vascular contour, bronchial morphology, axillary lymph node) was evaluated and compared. Results Pulmonary textures and mediastinal macrovascular contours were observed between the low dose iDOSE4 group and the normal dose group. There was no significant difference in bronchial morphology score between low dose group (P < 0. 633) and low dose group (P 0. 633P 0. 843). The axillary lymph node score and the total score of 4 items in low dose group were lower than those in normal dose group (P 0. 000 P 0. 000), lung texture and mediastinal great vessel contour in low dose iDOSE~4 group and 64 row conventional dose group were lower than those in normal dose group. There was no significant difference in bronchial morphologic score. There was no significant difference in the quality of CT images between the conventional dose group and the 64 row routine dose group. The axillary lymph node score and the total score of 4 items in the low dose group were lower than those in the 64 row routine dose group. The radiation dose value of each group was from high to low. According to this, 64 rows of conventional dose group (13.6m Gy) and iDOSE~4 low-dose group (3.4m Gy). Conclusion the low dose iDOSE~4 technique of 256-slice I CT can obtain reliable image quality, only the axillary lymph node display ability is slightly lower than the conventional dose, but it can significantly reduce the radiation dose.
【作者单位】：上海交通大学医学院附属第九人民医院医学影像科;
【基金】：上海市科委科技创新行动计划重点项目(10411953400) 上海市卫生和计划生育委员会项目(20124194) 上海市宝山区科学技术委员会科研项目(14-E-4)~~
【分类号】：R816.4

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