低管电压联合管电流自动调节技术降低下肢动脉CTA辐射剂量

发布时间：2018-07-20 11:41

【摘要】：目的探讨低管电压结合管电流自动调节技术实现下肢动脉CTA低剂量扫描的可行性。方法将64例患者分为3组行下肢动脉CTA检查,A组管电压120kV,管电流自动调节范围50~250mA;B组管电压100kV,管电流自动调节范围50~350mA;C组管电压80kV,管电流自动调节范围100~350mA;获得腹主动脉、股动脉及乆动脉CT值、图像噪声、SNR、扫描长度(SL)、容积CT剂量指数(CTDIvol)及剂量长度乘积(DLP)。并对图像质量进行主观评价。结果3组间腹主动脉、股动脉及乆动脉CT值、图像噪声、SNR差异均有统计学意义(P均0.05)。3组间SL差异无统计学意义(P0.05),CTDIvol、DLP差异均有统计学意义(P均0.05)。A、B、C组图像均可满足诊断要求,主观图像质量评分分别为(2.50±0.51)分、(2.44±0.63)分及(2.41±0.56)分,差异无统计学意义(P0.05)。结论低管电压结合管电流自动调节技术,可在获得符合诊断要求图像的同时,降低下肢动脉CTA扫描辐射剂量。
[Abstract]:Objective to investigate the feasibility of low dose CTA scanning of lower extremity artery by low tube voltage and tube current automatic regulation. Methods Sixty-four patients were divided into 3 groups: the voltage of tube was 120kV, the automatic regulation range of tube current was 50kV, the voltage of tube current was 100kV, the range of automatic regulation of tube current was 50 ~ 350mAn C group (80kV), and the range of automatic regulation of tube current was 100 ~ 350mA.The abdominal aorta was obtained. The CT value of femoral artery and human artery, image noise SNR, scan length (SL), volume CT dose index (CTDIvol) and dose length product (DLP). The image quality is evaluated subjectively. Results the CT value of abdominal aorta, femoral artery and femoral artery, image noise and SNR were significantly different among the three groups (P 0.05). There was no significant difference in SL between three groups (P0.05). The subjective image quality scores were (2.50 卤0.51), (2.44 卤0.63) and (2.41 卤0.56), respectively (P0.05). Conclusion the technique of low tube voltage and automatic regulation of tube current can reduce the radiation dose of CTA scan of lower extremity artery while obtaining the image in accordance with the diagnostic requirements.
【作者单位】：北京中医药大学东方医院放射科;北京师范大学医院放射科;
【分类号】：R816.2

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