第3代双源CT70kV管电压和20～25ml对比剂模式下行头颈联合CT血管成像在体质量小于75kg人群中的效果
发布时间：2018-08-23 12:23
【摘要】：目的观察第3代双源CT 70 kV管电压和20~25 ml对比剂模式下行头颈联合CT血管成像的效果,评估注射同侧对比剂滞留产生的静脉伪影对图像质量的影响。方法采用随机表格法将怀疑或已有头颈部动脉血管疾病、体质量小于75 kg行头颈第3代双源CT血管成像扫描的40例患者随机分为70 kV组和100 kV组,每组20例,70 kV组采用20~25 ml对比剂和高级模拟迭代重建技术;100 kV组采用40 ml对比剂和滤波反投影技术。采用3分法对对比剂滞留产生的静脉伪影及对比剂滞留范围进行主观评分。结果 70 kV组有效剂量较100 kV组下降约58%(t=-18.14,P0.001)。70 kV组20例患者中,16例(80.0%)存在静脉伪影,其中6例(37.5%,6/16)的静脉伪影影响邻近动脉的评价;100 kV组20例患者中,19例(95.0%)存在静脉伪影,其中7例(36.8%,7/19)的静脉伪影影响邻近动脉的评价;两组间差异无统计学意义(Z=-0.878,P=0.380)。70 kV组20例患者中,13例(65.0%)对比剂滞留较明显,其中2例(15.3%,2/13)对比剂滞留延续至上腔静脉;100 kV组20例患者中,19例(95.0%)对比剂滞留较明显,其中13例(68.4%,13/19)对比剂滞留延续至上腔静脉;两组间差异有统计学意义(Z=-3.654,P0.001)。结论第3代双源CT 70 kV管电压和20~25 ml对比剂模式下行头颈联合CT血管成像,较100 kV扫描辐射剂量明显下降,对比剂滞留范围明显减低,静脉伪影与100 kV组相近。
[Abstract]:Objective to observe the effect of combined head and neck CT angiography under the third generation dual-source CT 70 kV tube voltage and 20 ~ (25 ml) contrast medium mode, and to evaluate the effect of venous artifact caused by ipsilateral contrast agent retention on image quality. Methods A total of 40 patients with suspected or existing head and neck artery diseases with body mass less than 75 kg were randomly divided into 70 kV group and 100 kV group. 20 cases of 70 kV group in each group were treated with 20 25 ml contrast agent and 100 kV group with 40 ml contrast agent and filter backprojection technique. A 3-score method was used to evaluate the venous artifacts and the range of retention of contrast agents. Results the effective dose of 70 kV group was about 58% lower than that of 100 kV group (t ~ (-18.14) P 0.001). Among 20 cases of 70 kV group, 16 cases (80.0%) had venous artifact. Among them, 6 cases (37.5%) had venous artifact influence on the evaluation of adjacent artery. 19 cases (95.0%) of 20 patients in 100 kV group had venous artifact. The venous artifacts of 7 cases (36.8% / 19) affected the evaluation of adjacent arteries, and there was no significant difference between the two groups (Z-0.878P 0.380) .13cases (65.0%) of 20 patients in the 70 kV group had significant retention of contrast agent. Of the 20 patients with superior vena cava, 19 cases (95.0%) were retained by contrast agent (15.3 / 13) and 13 cases (68.4% / 1319) by contrast agent. The difference between the two groups was statistically significant (Z-3.654P0.001). Conclusion the combined head and neck CT angiography under the third generation dual-source CT 70 kV tube voltage and 20 ~ (25 ml) contrast medium mode is significantly lower than that of 100 kV scanning radiation dose, the range of contrast agent retention is obviously reduced, and the venous artifact is similar to that of 100 kV group.
【作者单位】： 中国医学科学院北京协和医学院北京协和医院放射科;
【基金】：国家临床重点专科建设项目(2014) 卫生公益性行业科研专项项目(201402019)~~
【分类号】：R816.1
，
本文编号：2199070
[Abstract]:Objective to observe the effect of combined head and neck CT angiography under the third generation dual-source CT 70 kV tube voltage and 20 ~ (25 ml) contrast medium mode, and to evaluate the effect of venous artifact caused by ipsilateral contrast agent retention on image quality. Methods A total of 40 patients with suspected or existing head and neck artery diseases with body mass less than 75 kg were randomly divided into 70 kV group and 100 kV group. 20 cases of 70 kV group in each group were treated with 20 25 ml contrast agent and 100 kV group with 40 ml contrast agent and filter backprojection technique. A 3-score method was used to evaluate the venous artifacts and the range of retention of contrast agents. Results the effective dose of 70 kV group was about 58% lower than that of 100 kV group (t ~ (-18.14) P 0.001). Among 20 cases of 70 kV group, 16 cases (80.0%) had venous artifact. Among them, 6 cases (37.5%) had venous artifact influence on the evaluation of adjacent artery. 19 cases (95.0%) of 20 patients in 100 kV group had venous artifact. The venous artifacts of 7 cases (36.8% / 19) affected the evaluation of adjacent arteries, and there was no significant difference between the two groups (Z-0.878P 0.380) .13cases (65.0%) of 20 patients in the 70 kV group had significant retention of contrast agent. Of the 20 patients with superior vena cava, 19 cases (95.0%) were retained by contrast agent (15.3 / 13) and 13 cases (68.4% / 1319) by contrast agent. The difference between the two groups was statistically significant (Z-3.654P0.001). Conclusion the combined head and neck CT angiography under the third generation dual-source CT 70 kV tube voltage and 20 ~ (25 ml) contrast medium mode is significantly lower than that of 100 kV scanning radiation dose, the range of contrast agent retention is obviously reduced, and the venous artifact is similar to that of 100 kV group.
【作者单位】： 中国医学科学院北京协和医学院北京协和医院放射科;
【基金】：国家临床重点专科建设项目(2014) 卫生公益性行业科研专项项目(201402019)~~
【分类号】：R816.1
，
本文编号：2199070
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