不同心率患者采用大螺距双源CT冠状动脉成像的图像质量及影响因素分析  被引量:19

The image quality and influencing factors of high-pitch dual-source CT coronary angiography in patients with different heart rates

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作  者:孙凯[1] 韩瑞娟[2] 赵瑞平[2] 马利军[1] 王志琴[1] 赵冬梅[1] 王刚[1] 贾海亮[1] 白敬卫[1] 王利军[1] 李立刚 

机构地区:[1]包头市中心医院影像中心,014040 [2]包头市中心医院心内科,014040 [3]西门子中国CT事业部

出  处:《中华放射学杂志》2012年第9期773-778,共6页Chinese Journal of Radiology

基  金:内蒙古科技计划项目(20110504)

摘  要:目的对不同心率患者采用大螺距双源cT前瞻性心电门控螺旋扫描(Flashspiral模式)冠状动脉成像(CCTA),与回顾性心电门控扫描(spiral模式)比较,评价图像质量、影响因素及有效射线剂量。方法选择采用Flashspiral模式CCTA,心率〉65且≤100次/min(bpm)的连续性患者134例为A组,心率≤65且≤100bpm的患者134例为B组;采用spiral模式,心率〉65且≤100bpm的患者134例为C组。A组图像采集时间为R—R问期20%~30%,B组为R—R间期55%,C组采用spiral模式扫描。比较3组患者扫描参数、有效射线剂量、图像质量等,分析图像质量的影响因素。A与B组、A与c组间的心率、有效射线剂量比较采用非配对t检验;3组间年龄、体质量指数(BMI)、扫描时间、心率变异性比较采用方差分析;不可诊断血管发生率的比较采用卡方检验。结果(1)基于血管节段评价,A组不可诊断节段(28/1842,1.52%)显著高于B组(8/1819,0.44%),差异有统计学意义(x。=10.97,P=0.001),A与C组(32/1838,1.74%)比较,差异无统计学意义(x。=0.280,P=0.345)。基于患者评价,A组不可诊断血管患者(10/134,7.5%)显著高于B组(2/134,1.5%;x。=5.52,P=0.018),A与c组(9/134,6.7%)比较,差异无统计学意义()(2=0.057,P=0.812)。(2)3组患者不同图像质量评分的平均心率变异性(HRV)比较,A组评分1、2、3级患者的HRV分别为(2.294-1.06)、(5.17±1.37)、(8.88±1.53)bpm(F=170.402,P=0.001);B组分别为(2.26±1.01)、(5.97±1.82)、(12.00±9.64)bpm(F=95.843,P=0.001);C组分别为(2.61±1.85)、(7.90±3.97)、(11.22±5.62)bpm(F=68.629,P=0.001),差异均有统计学意义。C组中9例扫描失败患者中,由于呼吸运动导致心脏扫描不连续所致的�Objectives To investigate the image quality, influencing factors and radiation doses of prospectively ECG-tfiggered spiral acquisition mode ( Flash spiral mode ) coronary computed tomography angiography (CCTA) using high-pitch dual-source CT in patients with different heart rates. Methods One hundred and thirty-four consecutive patients with mean heart rate (HR) 〉 65 beats per minute (bpm) and≤ 100 bpm were included in this study as group A using Flash spiral mode setting at 20% --30% of the R-R interval and 134 consecutive patients with mean HR≤65 bpm were enrolled as group B using Flash spiral scan mode at 55% of the R-R interval; 134 consecutive patients with mean HR 〉 65 ands〈 100 bnm using spiral scan mode were included as group C. The image quality scores, effective radiation dose and influencing factors of image quality in three groups were assessed. All statistical analyses were performed using SPSS. Results ( 1 ) The non-diagnostic coronary artery segments in group A (28/1842,1.52%) were more than in group B (8/1819,0.44%)(x2 = 10. 97, P = 0. 001 )and there was no significant difference between group A and group C (32/1838,1.74%) (x2 =0. 280, P =0. 345). The number of patients with non-diagnostic coronary segments in group A (10/134,7.5 % )was more than in group B (2/134,1.5 %, x2 = 5. 52 ,P =0. 018 ), while there was no significant difference between group A and group C( 9/134,6. 7%, x2=0. 057, P= 0. 812). (2)The average heart rate variability (HRV) of patients with different image scores in the three groups were significantly different. In group A, the HRV of score 1,2 and 3 were (2. 29 ± 1.06), (5.17 ± 1.37), (8.88± 1.53 ) bpm, respectively ( F = 170. 402, P = 0. 001 ). In group B were (2. 26 ± 1.01 ), (5.97 ± 1.82), ( 12. 00± 9. 64) bpm, respectively ( F = 95. 843, P = O. 001 ). In group C were ( 2. 61 ± 1.85 ), ( 7.90 ± 3.97 ), ( 11.22± 5.62 ) bpm, respectively ( F = 68.629, P

关 键 词:冠状血管 心率 体层摄影术 螺旋计算机 心脏门控成像技术 

分 类 号:R816.2[医药卫生—放射医学]

 

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