双低剂量在头颈部无迭代技术多层螺旋CT血管成像中的可行性

发布时间：2018-05-01 02:23

本文选题：脑血管造影术 + 颈动脉　；参考：《中国医学影像学杂志》2015年11期

【摘要】：目的通过探讨双低剂量在头颈部无迭代技术多层螺旋CT血管成像(CTA)应用中的可行性,实现在降低辐射剂量的基础上减少对比剂使用量,以降低受检者辐射危害和对比剂肾病发病率。资料与方法选取51例行双低剂量头颈CTA检查的患者作为双低组[管电压100 kV,管电流300 m A,对比剂0.7 ml/kg碘佛醇(320mg I/ml)],51例行常规剂量头颈CTA检查的患者作为常规组[管电压120 kV,管电流350 m A,对比剂1.0 ml/kg碘佛醇(320 mg I/ml)]。测量两组患者血管内CT值和背景噪声,比较两组患者信噪比(SNR)、对比噪声比(CNR)、图像质量主观评分、辐射剂量及碘负荷量。结果双低组与常规组容积CT剂量指数分别为18.00 m Gy、33.86 m Gy,有效剂量分别为3.85 m Sv/(m Gy·cm)、7.25 m Sv/(m Gy·cm),碘负荷量分别为224 mg I/kg、320 mg I/kg。双低组主动脉弓SNR及CNR高于常规组,但差异无统计学意义(t=-1.572、-1.783,P0.05);双侧颈总动脉、颈内动脉、大脑中动脉SNR及CNR均低于常规组,但差异无统计学意义(t=0.341~1.739,P0.05)。双低组及常规组图像质量主观评分分别为(3.69±0.47)分、(3.70±0.46)分,差异无统计学意义(Z=-0.213,P0.05)。结论采用双低剂量扫描技术在无迭代技术螺旋CT行头颈部CTA检查可以获得质量满意的图像。
[Abstract]:Objective to explore the feasibility of the application of double low dose in multislice spiral CT angiography (CTAA) without iterative technique in head and neck, so as to reduce the dosage of contrast agent on the basis of reducing radiation dose. In order to reduce the radiation hazards and the incidence of contrast nephropathy. Materials and methods 51 patients with double low dose head and neck CTA were selected as the double low group [tube voltage 100kV, tube current 300mA, contrast agent 0.7 ml/kg iodovolol 320mg I / ml] and 51 patients with routine dose head and neck CTA examination as routine group [tube] The voltage is 120kV, the current of the tube is 350mA, the contrast agent is 1.0 ml/kg iodovolol 320mg / ml]. Intravascular CT value and background noise were measured in two groups. The SNR of two groups were compared. The ratio of noise to noise, the subjective score of image quality, the dose of radiation and the amount of iodine load were compared. Results the volume CT dose index was 18.00mGy 33.86 mGy, the effective dose was 3.85m Sv/(m Gy CMY 7.25m Sv/(m Gy CMY, and the iodine load was 224mg / kg ~ 320 mg / kg ~ (-1) 路kg ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1), respectively. The SNR and CNR of aortic arch in the double low group were higher than those in the routine group, but there was no significant difference between the two groups, but the SNR and CNR of the bilateral common carotid artery, internal carotid artery, middle cerebral artery and middle cerebral artery were lower than those of the routine group, but the difference was not statistically significant. The subjective score of image quality in double low group and routine group was 3.69 卤0.47) and 3.70 卤0.46, respectively. The difference was not statistically significant (P 0.05). Conclusion double low dose scanning technique in spiral CT without iterative technique can obtain satisfactory quality of head and neck CTA.
【作者单位】：华北理工大学研究生学院;华北理工大学附属开滦总医院影像科;
【基金】：唐山市科技支撑计划项目(14130227a)
【分类号】：R743;R816.1

【参考文献】