前瞻性与回顾性心电门控CT冠状动脉成像的对照研究

目的：比较前瞻性与回顾性心电门控CT冠状动脉成像( CTCA)的差异和临床应用价值。方法将行64层CT冠状动脉成像的105例患者分为两组,54例采用前瞻性心电门控扫描技术( PGA组),51例采用回顾性心电门控扫描技术( RGH组),比较两组基本资料、图像质量、冠状动脉斑块与心肌桥诊断以及狭窄程度评估。结果两组患者性别、年龄、身高、体质量、体质量指数、扫描时平均心率及心率波动、主动脉 CT 值等差异无统汁学意义( P >0．05)。 PGA 和 RGH 组平均有效辐射剂量分别为(3．97±1．24)mSv、(14．37±1．59)mSv,差异有统计学意义(P<0．05),PGA组较RGH组有效辐射剂量减少约72．4%。 PGA组可评估的冠状动脉血管节段数共736段,RGH组可评估的冠状动脉血管节段数共702段,两组间冠状动脉节段图像质量分级评分、平均评分、斑块与心肌桥诊断以及狭窄程度评估差异无统计学意义(P>0．05)。结论 PGA相比RGH,辐射剂量明显减低,且图像质量和诊断效果无明显差异,具有较高的临床应用价值。

The comparative study of application of prospectively gated axial technique and retrospectively gated helical technique in CT coronary angiography

Objective To compare difference and clinical value of the prospectively gated axial ( PGA) technique and the retrospec-tively gated helical ( RGH) technique in CT coronary angiography. Methods All 105 patients examined with 64-slice CT coronary angiog-raphy were divided into 2 groups:54 patients with the PGA technique and 51 patients with the RGH technique. The general information, im-age quality, characteristics of coronary plaques, myocardial bridges and degree of coronary artery stenosis of the two groups were compared re-spectively. Results The general information such as gender, age, body height, body weight, body mass index, average heart rate and its fluctuation range, and aortic CT value of patients from the two groups showed no statistical significance(P>0. 05). The mean effective radia-tion dose of PGA group was (3. 97 ± 1. 24) mSv, whereas that of RGH group was (14. 37 ± 1. 59) mSv;the difference demonstrated therein was statistically significant (P<0. 05). The effective radiation dose of PGA group was 72. 4%, which was lower than that of RGH group. There were totally 736 evaluable segments of coronary artery in PGA group, there were totally 702 evaluable segments of coronary artery in RGH group, and the image quality score, the average score of segment, characteristics of coronary plaques, myocardial bridges and degree of coronary artery stenosis of the two groups showed no statistically significant difference ( P>0. 05 ) . Conclusion The PGA technique pres-ents high value in CT coronary angiography examination as it can effectively reduce the radiation dose while keep image quality and diagnosis effect almost unchanged in comparison with the RGH technique.