论文部分内容阅读
目的观察Test-Bolus法和Bolus-Tracking法两种扫描触发方式对MSCTPA图像质量的影响。方法对568例疑诊肺动脉栓塞患者行CTPA检查,根据扫描前预注射实验时的肺动脉监测峰值分为A组(≥150HU)和B组(<150HU),随机以Test-Bolus和Bolus-Tracking两种触发方法完成扫描;分析评估A、B两组中不同触发方式获得的CT-PA图像质量,测量并计算右肺下叶基底动脉及同一层面伴行肺静脉密度的差值。结果 A组采用Test-Bolus法获得的图像质量优于Bolus-Tracking法(F=40.05,P<0.01),B组采用Bolus-Tracking法获得的图像质量优于Test-Bolus法(F=67.84,P<0.01)。A组中采用Test-Bolus法获得的图像的成像密度差值高于Bolus-Tracking法(t=10.59,P<0.01),B组中采用Bolus-Tracking法获得的图像的成像密度差值高于Test-Bolus法(t=3.41,P<0.01)。结论对于小剂量预注射肺动脉监测峰值<150HU的患者,采用Bolus-Tracking法触发扫描能增加成像成功率和提高图像质量;而对于监测峰值>150HU者,采用Test-Bolus法则能更为合理。
Objective To observe the effects of two kinds of scanning triggering methods, Test-Bolus method and Bolus-Tracking method, on the image quality of MSCTPA. Methods CTPA was performed in 568 patients with suspected pulmonary embolism. According to the peak pulmonary artery monitoring before pre-injection, the patients were divided into two groups: group A (≥ 150HU) and group B (<150HU) The trigger method was used to complete the scan. The CT-PA images obtained by different triggering methods in group A and group B were analyzed and evaluated. The differences of the density of pulmonary veins in the right inferior lobe basilar artery and the same layer were measured and calculated. Results The images obtained by Test-Bolus method in group A were better than Bolus-Tracking method (F = 40.05, P <0.01), and those obtained by Bolus-Tracking method in group A were better than those by Test-Bolus method (F = 67.84, P <0.01). The difference between the images obtained by Test-Bolus method in group A was higher than that by Bolus-Tracking method (t = 10.59, P <0.01). The difference between the images obtained by Bolus-Tracking method in group B was higher Test-Bolus method (t = 3.41, P <0.01). Conclusion For low-dose pre-injection pulmonary artery monitoring peak <150HU patients, using the Bolus-Tracking method to trigger the scan can increase the imaging success rate and improve image quality; while for the peak value of> 150HU monitoring, Test-Bolus law can be more reasonable.