摘要
目的比较不同权重自适应统计迭代重建技术（ASIR）在低浓度对比剂及低辐射剂量条件下行冠状动脉CT血管造影（CTA）的图像质量。方法收集2014年3月至2014年8月间疑诊为冠心病并行冠状动脉CTA检查患者90例,体质指数（BMI）在20~25 kg/m2之间。行双低条件下（100 k Vp及270 mg I/ml碘克沙醇对比剂）及前瞻性心电门控技术行冠状动脉CTA扫描。扫描完成后对图像进行不同权重ASIR（0、20%、40%、60%、80%、100%）,并对图像质量进行主观及客观分析。结果相对于滤波反投影法（FBP）,20%、40%、60%、80%、100%ASIR图像噪声分别降低12%、24%、33%、46%、51%,差异有统计学意义（P〈0.01）;信噪比、对比噪声比分别提高约7%、22%、50%、81%、103%及8%、23%、50%、81%、101%。不同权重ASIR重建图像CT值差异无统计学意义。0、20%、40%、60%、80%、100%ASIR的主观评分分别为1.5、1.9、3.9、4.0、2.0和1.2分,差异有统计学意义（P〈0.05）。权重设置在40%、60%ASIR图像质量具有最高主观评分,冠状动脉图像质量最好。结论在双低条件下及ASIR重建技术行冠状动脉CTA检查,相对于FBP重建算法,不同权重ASIR图像在40%、60%图像质量具有最高主观评分,图像质量最好。
Objective To compare the image quality of different percentage ASIR using 100 k Vp and 270 mg I / ml iodixanol in coronary artery CT angiography（ CTA） with 64 slice spiral CT scanner. Methods Totally 90 patients whose BMI were20 to 25 kg / m2 with suspected coronary disease underwent coronary artery CTA from March 2013 to August 2013. Coronary artery CTA scanning parameters and group information were as follows： 100 k Vp,600 m A; contrast media： Visopaque270 mg I / ml. Raw data was reconstructed with different percentages of ASIR（ 0,20%,40%,60%,80%,100%）. Results In comparison with FBP（ 0 ASIR）,the use of 20%,40%,60%,80% and 100% ASIR resulted in reduced image noise between groups（- 12%,- 24%,- 33%,- 46% and- 51% respectively; P〈0. 01） without difference in the mean CT attenuation of the measured vessels. ASIR also increased SNR and CNR between groups（ 7%,22%,50%,81%,103% and8%,23%,50%,81%,101%,respectively; P〈0. 01）. There were significant differences between groups（ 0,20%,40%,60%,80% and 100% ASIR） in the subjective scores（ 1. 5,1. 9,3. 9,4. 0,2. 0 and 1. 2 respectively; P〈0. 01）. Reconstruction using 40% and 60% ASIR had the highest subjective scores and the best imaging quality for coronary artery. Conclusion In comparison with FBP,reconstruction using 40% and 60% ASIR had the highest subjective scores of imaging quality in coronary artery CTA.
出处
《创伤与急危重病医学》
2015年第2期87-90,共4页
Trauma and Critical Care Medicine
