前门控CT冠脉造影低体质量指数与图像质量相关性研究
Correlation Analysis between Low Body Mass Index and Image Quality Using PGA CT Technique
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摘要: 目的:在固定球管输出的情况下,观察低体质量指数与图像质量的相关性。方法:研究选取心率≤65bpm、心率变异≤5bpm、体质量指数≤24kg/m<sup<2</sup<患者40例,平均年龄(53.16±6.53)岁,平均体质量指数(20.12±2.13)kg/m<sup<2</sup<。所选患者采用前瞻性心电门控技术,管电压120kV,管电流400mA。扫描结束后测量主动脉根部衰减值、噪声值,并计算信噪比。采用Pearson相关分析体质量指数与图像质量的相关性。结果:Pearson相关分析示体质量指数与主动脉衰减值无相关(<i<r</i<=0.163,<i<P</i<=0.314),体质量指数与噪声值为正相关(<i<r</i<=0.714,<i<P</i<=0.000),体质量指数与信噪比为负相关(<i<r</i<=-0.545,<i<P</i<=0.000)。结论:通过体质量指数进行管电流个体化设置理论上可以达到减低辐射剂量的目的。Abstract: Objective:To evaluate the relationship between body mass index(BMI)and image quality for fixed tube current and tube voltage.Methods:Forty patients with average body mass index(BMI)20.12 kg/m<sup<2</sup<,average age 53.16 years were included in this study,using PGA scan technique(tube voltage was 120 kV and tube current was 400 mA).All patients were evaluated for mean attenuation,noise,signal-to-noise ratio(SNR)in aortic root. To evaluate the relationship between body mass index(BMI)and image quality using Pearson correlation analysis. AP value below 0.05 was considered to be statistically significant.Results:The BMI was statistically significant influence on noise,signal-to-noise ratio(<i<P</i<=0.000).The BMI was no statistically significant influence on the mean attenuation(<i<P</i<=0.314).Conclusion:The use of low BMI adapted mA selection method can obtain consistent image quality in abstracto and may reduced effective dose.
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