较低管电压联合Care Dose 4D技术对主动脉成像图像质量和辐射剂量的影响

发布时间：2018-11-27 15:22

【摘要】：目的采用单源光子CT较低管电压联合Care Dose 4D技术,评价主动脉成像图像质量和辐射剂量。方法 43例患者按照扫描管电压随机分为2组,即120 k V组(n=19)和100 k V组(n=24)。平扫采用固定管电压(100、120 k V),增强扫描采用自动管电压调节技术(Care k V),参考管电压预设为100、120 k V,平扫和增强扫描均联合Care Dose 4D技术。比较不同扫描条件下2组患者主动脉图像质量、CT值和辐射剂量变化,包括平均容积CT剂量指数(CTDIvol)、剂量长度乘积(DLP)和有效剂量(ED)。结果平扫,2组主动脉上中下段CT值差异无统计学意义(P0.05),100 k V组辐射剂量(CTDIvol、DLP、ED)明显低于120 k V组。平扫和增强扫描,100 k V组有效剂量ED较120 k V组分别降低41.36%和67.80%。Care 100 k V组主动脉各段的CT值均高于120 k V组(P0.05),两组主动脉成像图像质量评分差异无统计学意义(P0.05)。结论联合Care Dose 4D技术,Care k V低管电压能够明显降低主动脉CT血管成像辐射剂量,而图像质量不受影响。
[Abstract]:Aim to evaluate the image quality and radiation dose of aortic imaging by single source photon CT with low tube voltage and Care Dose 4D technique. Methods 43 patients were randomly divided into two groups according to the voltage of scanning tube: 120 kV group (n = 19) and 100 kV group (n = 24). In plain scan, the fixed tube voltage (100120 k V), enhanced scan) was used to adjust the voltage of (Care k V), reference tube. The voltage of (Care k V), reference tube was set to 100120 kV. Both plain scan and enhanced scan combined with Care Dose 4D technology. The changes of aortic image quality, CT value and radiation dose were compared between two groups under different scanning conditions, including mean volume CT dose index (CTDIvol), dose length product (DLP) and effective dose (ED). Results there was no significant difference in CT between the two groups (P0.05). The radiation dose (CTDIvol,DLP,ED) of 100kV group was significantly lower than that of 120kV group. The effective dose of ED in 100kV group decreased by 41.36% and that of 67.80%.Care 100kV group was higher than that of 120kV group (P0.05), and the CT value of each segment of aorta in 100kV group was higher than that in 120kV group (P0.05). There was no significant difference in image quality between the two groups (P0.05). Conclusion the low tube voltage of, Care k V combined with Care Dose 4D technique can significantly reduce the radiation dose of aortic CT angiography, but the image quality is not affected.
【作者单位】：重庆市垫江县人民医院放射科;第三军医大学大坪医院野战外科研究所放射科;
【基金】：垫江县科技专项资金(djkjxm2015jsyfysfyy028)~~
【分类号】：R816.2

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