摘要
目的探讨双源CT前瞻性心电触发序列(SAS)模式扫描头颈部血管成像的图像质量及辐射剂量。方法前瞻性将60例临床怀疑或确诊的头颈部血管性病变的患者按照随机数字表法分为两组。A组30例行SASCTA模式扫描头颈部血管,采集期相:应用60%R-R间期的ECG演示模式;B组30例行双能量CTA(DE-CTA)扫描。对2组患者头颈部血管CTA分别做图像后处理(由2名有经验的放射副主任医师,利用双盲法、以5分法评定系统对血管成像质量进行评分,计算2名医师评价图像质量的一致性),应用配对样本t检验方法统计分析扫描参数、图像质量评分及辐射剂量。结果 2组间患者扫描范围差异无统计学意义(t=-0.618,P=0.541)。2组患者图像质量评分,分别为4.50±0.68;4.43±0.67,2组间图像质量评分差异无统计学意义(t=0.571,P=0.573)。A组辐射剂量剂量长度乘积(DLP)及平均曝光时间分别为(222.73±26.88)mGy×cm;(1.88±0.13)s,B组分别为(599.83±74.18)mGy×cm;(4.56±0.29)s,2组间DLP及平均曝光时间差异有统计学意义(t=-28.370,t=-46.811,P=0.000)。SAS-CTA辐射剂量与DE-CTA比较降幅达到62.87%。结论 SAS-CTA模式应用于头颈部血管成像,可在保证图像质量的同时显著降低辐射剂量。
Objective To study the image quality and radiation dose of dual source CT head and neck angiography with prospective ECG triggered sequence mode （step and shoot, SAS）. Methods According to the random number table, 60 patients clinically suspected or confirmed head and neck vascular disease were divided into two groups, group A （30 ca ses） and group B（30 cases）. Prospective ECG triggered sequence scan mode was employed for group A. Date acquisition was at 60% R R interval of the ECG presentation mode. Dual energy CTA （ DE CTA） scan mode was employed for group B. Image ostprocessing was taken in 2 groups, the scan parameters of head and neck angiography, image quality score and radiation dose were paired samples t test statistical analysis. Double blind method and five point rating system of ascular imaging quality were calculated by two experienced radiologist to evaluate image quality consistency. Results There was no statistical difference in scan range between the two groups （ t = 0. 618, P = 0. 541 ） , image quality scores of 2 groups were 4.50 ±0.68 ;4.43 ± 0.67. There was no statistical difference in image quality score between the two groups （t = 0. 571, P 0. 573）. DLP （ dose length product ） and the mean exposure time were （ 222.73 ± 26.88 ） mGy xcmingroupA;（ 1.88 ±0.13） s , （599.83±74.18 ） mGy xcm; （4.56 ±0.29） s in group B , There was a statistical difference in DLP and the mean exposure time between the two groups （t = 28. 370, t = 46. 811 ,P = 0.000）. SAS CTA radiation dose compared with DE CTA was decreased by 62.87%. Conclusion Prospective ECG triggering sequence mode can be used in head and neck angiography with a significant reduction in radiation dose and diag nostic image quality.
出处
《临床放射学杂志》
CSCD
北大核心
2013年第11期1666-1669,共4页
Journal of Clinical Radiology
