摘要
目的 探讨团注追踪法下降低触发阈值对于高心率(75~100次/min)患者冠状动脉CT血管造影成像(CCTA)质量的影响。方法 选取2021年7~11月就诊于华北理工大学附属医院行CCTA的高心率患者40例,根据触发阈值分为A、B两组,每组均为20例,A组阈值为100HU,B组阈值为80HU。选择前瞻性心电门控轴扫,对比剂均使用碘美普尔(400mg I/mL),剂量为40mL,速率为4.0mL/s。监测点置于升主动脉根部,比较两组间主观图像质量评分,客观图像评价指标及辐射剂量参数的差异。结果 A、B两组主动脉根部CT值、左主干CT值、信号噪声比(SNR)及对比度噪声比(CNR)比较,差异均有统计学意义(P<0.05),且B组均高于A组。B组主动脉根部CT值、左主干CT值、SNR、CNR分别为(455.49±55.46)HU、(430.49±52.03)HU、(21.08±3.78)、(25.69±4.54),A组分别为(375.58±102.86)HU、(350.73±91.68)HU、(15.97±4.52)、(19.88±6.18)。两组右冠状动脉中段CT值、图像噪声比较,差异均无统计学意义(P>0.05)。两组主观图像质量评分比较、辐射剂量参数比较差异均无统计学意义(P>0.05)。结论 使用团注追踪法对高心率患者行CCTA扫描,降低触发阈值(80HU)比常规阈值(100HU)能够获得更好的图像质量。
Objective To investigate the effect of lowering trigger threshold on the imaging quality of coronary computed tomography angiography in patients with high heart rate under bolus tracking method. Methods A total of 40 patients treated in the Affiliated Hospital of North China University of Science and Technology from July 2021 to November 2021 with high heart rate(75~100 beats/min) who underwent coronary CCTA were selected and divided into groups A and B according to the trigger threshold, with 20 cases in each group. The threshold of group A was 100HU, and the threshold of group B was 80HU. Prospective ECG gated axial scan was selected, and the contrast agent was Limepirol(400mg I/mL) at a dose of 40 mL at a rate of 4.0 mL/s. The monitoring point was placed at the root of the ascending aorta. The injection scheme and scanning conditions were the same. The differences in subjective image quality scores, objective image evaluation indicators and radiation dose parameters were compared between the two groups. Results There were statistically significant differences in CT values of aortic root, left main trunk, signal-to-noise ratio and contrast-to-noise ratio between groups A and B(P<0.05). The CT value of aortic root, the CT value of left main trunk, signal-to-noise ratio and contrast-to-noise ratio in group B(455.49±55.46)HU,(430.49±52.03)HU,(21.08±3.78),(25.69±4.54) were higher than those in group A(375.58±102.86) HU,(350.73±91.68) HU,(15.97±4.52),(19.88±6.18). There was no significant difference in CT value and image noise in the middle right coronary segment between the two groups(P>0.05). There was no significant difference in subjective image quality scores between the two groups(χ~2=1.400,P>0.05). There was no significant difference in radiation dose parameters between the two groups(P>0.05). Conclusion In coronary CCTA scans of patients with high heart rate using bolus tracking, lower trigger threshold(80HU) can obtain better image quality than conventional threshold(100HU).
作者
黄雯暄
张惠英
Huang Wenxuan;Zhang Huiying(CT Room,the Affiliated Hospital of North China University of Science and Technology,Tangshan 06300,China)
出处
《华北理工大学学报（医学版）》
2023年第1期30-35,共6页
Journal of North China University of Science and Technology：Health Sciences Edition
关键词
团注追踪法
冠状动脉CT血管造影
心率
触发阈值
Bolus-tracking
Coronary computed tomography angiography
Heart rate
Triggering threshold
