256层iCT用不同触发方式对低对比剂头颈血管CTA联合扫描成像图像质量的评价  

Evaluation of Image Quality in Combined Low-Contrast Head and Neck CTA Using Different Triggering Methods with 256-layer iCT

作　　者：赵德春 余可斌 ZHAO Dechun;YU Kebin(The Second Affiliated Hospital of Chengdu Medical College/China National Nuclear Corporation 416 Hospital,Sichuan Chengdu 610051,China)

机构地区：[1]成都医学院第二附属医院/核工业四一六医院放射科,四川成都610051

出　　处：《河北医学》2023年第12期2068-2072,共5页Hebei Medicine

基　　金：四川省卫生和计划生育委员会科研课题(编号:18PJ494)。

摘　　要：目的:观察小剂量测试(Test-Bolus)法和团注追踪(Bolus-Tracking)法两种不同触发方式对低对比剂头颈CTA血管联合扫描成像图像质量的评价。方法:随机抽取本院2022年11月至2023年3月在本科室完成的100例头颈CTA血管成像图像为样本分别为:采用A组Test-Bolus法50例;采用B组Bolus-Tracking法50例,回顾性分析两种不同触发扫描方式对图像质量影响。结果:A组采用Test-Bolus法获得的图像,颈总动脉平均CT值为(338.06±73.54)HU,大脑中动脉平均CT值为(323.72±73.13)HU,成像质量上高于B组,静脉干扰较少;B组采用Bolus-Tracking法获得的图像,颈总动脉平均CT值为(276.82±66.72)HU,大脑中动脉平均CT值为(270.32±65.39)HU,静脉稍多但不影响诊断,成像质量稍差。通过对A、B两组颈总动脉与大脑中动脉CT值客观评价差异均有统计学意义(P<0.05)。组间优良率主观评价,A组:优秀率为70%(35/50)、优良率为90%(45/50);B组:优秀率为40(20/50)、优良率86%(43/50),A组图像质量优于B组,A组图像优秀率高于B组,差异有统计学意义(P<0.05),而图像优良率的差异无统计学意义(P>0.05)。结论:两种方法成像质量都能满足诊断要求,但采用Test-Bolus法扫描能提高图像质量,静脉干扰较少。Objective:To observe the evaluation of the image quality of low-contrast head and neck CTA vascular scanning by two different triggering Methods:Test-Bolus and Bolus-Tracking.Methods:A total of 100 cases of head and neck CTA images completed in our department from November 2022 to March 2023 were randomly selected.Among them,Group A comprised 50 cases using the test-bolus method,and Group B comprised 50 cases using the bolus-tracking method.A retrospective analysis was performed to assess the impact of the two different triggering methods on image quality.Results:In Group A,images obtained u-sing the test-bolus method had an average CT value of(338.06±73.54)HU for the carotid arteries and(323.72±73.13)HU for the cerebral middle arteries,with higher image quality compared to Group B.Group B,using the bolus-tracking method,had an average CT value of(276.82±66.72)HU for the carotid arteries and(270.32±65.39)HU for the cerebral middle arteries,with slightly more venous interference but without affecting diagnosis,and slightly inferior image quality.The objective evaluation of the CT values of the carotid and cerebral middle arteries in Groups A and B showed statistically significant differences(P<0.05).The subjective evaluation of the excellent and good rates between the two groups showed that Group A had a higher excellent rate(70%,35/50)and a higher excellent and good rate(90%,45/50)compared to Group B(ex-cellent rate:40%,20/50;excellent and good rate:86%,43/50),with statistically significant differences(P<0.05)in image quality but not in the excellent and good rate(P>0.05).Conclusion:Both imaging methods can meet diagnostic requirements,but using the test-bolus method for scanning can improve image quality with less venous interference.

关 键 词：低对比剂 CTA 头颈动脉成像 触发扫描阈值 触发方式 

分 类 号：R816.2[医药卫生—放射医学]