前瞻性心电门控技术在诊断先天性冠状动脉变异中的应用

Application of prospective ECG-gating technique in diagnosis of coronary artery anomalies

目的:探讨64排128层CT前瞻性心电门控技术在诊断先天性冠状动脉变异中的应用。方法:收集60例心率<70次/min的先天性冠状动脉变异患者,分为前瞻性心电门控组(观察组)和回顾性心电门控组(对照组),比较2组的成像质量和辐射剂量。结果:心率<70次/min时,前瞻性心电门控组和回顾性心电门控组图像质量差异无统计学意义(χ2=0.001,P>0.05)。二者的有效辐射剂量分别为(3.85±0.35)mSv、(8.79±0.72)mSv(t=-43.34,P<0.05)。结论:64排128层CT前瞻性心电门控技术较回顾性心电门控技术辐射剂量显著降低,在患者心率<70次/min时,图像质量较好,对冠状动脉变异的诊断具有较好的临床应用价值。

Objective： To evaluate the value of 64 rows of 128 layer CT prospective gating technique in diagnosis of congenital coronary artery anomalies. Methods：60 patients were selected with heart rate 〈70/min, divided into prospective ECG-gating group （group A） and retrospective ECG-gating group （group B）. Image quality and radiation dose of A, B two groups were compared. Results： Heart rate 〈70/min, the image quality of prospective ECCj-gating group and retrospective ECG-gating group had no statistical significance （χ^2=0. 001, P〉0.05）. Effective radiation dose of both were （4. 020±0. 463） mSv and （16. 649±1. 232） mSv （t=-53. 869, P〈0.05）. Conclusion： The radiation dose of 64 rows of 128 layer CT prospective gating technology decreased significantly compared with retrospective ECG-gating, especially in the heart rate 〈70 /min, the resulting image quality is good, with good clinical application value in diagnosis of coronary artery anomalies.