双源CT Flash大螺距技术对主动脉成像的辐射剂量及升主动脉图像质量的研究

Study of radiation dose and image quality of aorta at dual-source Flash Spiral CT

目的:探讨双源CT Flash大螺距扫描模式对主动脉的辐射剂量和升主动脉的图像质量优势。方法:将110例行主动脉CTA检查的患者随机分为A、B两组各55例,分别行传统扫描与Flash大螺距扫描,两组分别检出主动脉夹层患者45例、48例。对两种扫描模式下的主动脉辐射剂量和升主动脉图像质量进行对比评价。结果:两组患者的年龄、体重指数差异无统计学意义。两组的升主动脉图像质量评分差异有统计学意义,分别为2.1±0.7(A组)和1.4±0.6(B组)(t=5.2,P<0.05)。B组采用Flash Spiral扫描模式的辐射剂量为(2.7±0.6)mSv,低于传统扫描模式的(3.9±0.9)mSv,两组差异具有统计学意义(t=2.1,P<0.05)。结论:双源CT主动脉Flash大螺距扫描模式可以较低辐射剂量获得清晰的升主动脉图像,具有较高的临床应用价值。

Objective： To evaluate the application of dual-source Flash Spiral CT in aortography,and compare it’s image quality and radiation dose with traditional scanning mode.Methods： 110 patients suspected or known aortic dissection were divided into two groups.Group A underwent traditional scan mode and Group B underwent Flash Spiral scan mode.Both the image quality and radiation dose of the two groups were compared.Results： There was no significant difference in age and body mass index of the two groups.The average image quality score was 2.1±0.7 in group A and 1.4±0.6 in group B,with significant difference（t=5.2,P0.05）.The mean radiation dose of group B was lower than that of group A（（2.7±0.6） mSv,（3.9± 0.9） mSv;t=2.1,P0.05）.Conclusion： Dual-source Flash Spiral CT scanning with low radiation dose and good image quality in demonstrating aortic dissection with high clinical application value.