目的：利用双源CT大螺距Flash扫描模式对胸腹主动脉进行扫描成像，对照评价其图像质量和辐射剂量，探讨其应用价值。方法：将我院50例行胸腹主动脉CTA检查的患者随机分为A、B 2组，A组使用Flash大螺距扫描模式，B组使用常规扫描模式。对2种扫描模式下的主动脉图像质量和辐射剂量进行对比评价，客观评价包括图像噪声和信噪比。主观评价由2名放射科医生独立完成，辐射剂量统计使用设备自带的数据。结果：A组图像质量评分（2．21±0．58）低于B组（2．66±0．21），差异有统计学意义（P＜0．05）。客观图像质量对比无明显差异。扫描时间A组（2．3±0．10）s，比B组（7．8±0．90）s缩短，差异有统计学意义（P＜0．05）；A组的辐射剂量（2．9±0．6）mSv，对比B组（3．8±0．7）mSv，差异有统计学意义（P＜0．05）。结论：双源CT的Flash大螺距模式扫描胸腹主动脉时，可以获得清晰的主动脉图像，能满足胸腹主动脉病变的诊断；扫描时间短，辐射剂量少，在急诊主动脉大血管扫描检查有较高临床应用价值。%Objective]The use of high pitch dual source CT scan mode for Flash scan imaging of the thoracic and abdominal aorta,evaluating the image quality and radiation dose,to explore its application value .[Method]50 patients with CTA in our hospital were randomly divided into group A and group B .Group A was used in Flash group,and B group was used in routine scan mode .Evaluation of the quality and radiation dose of aortic images was carrying out in two different scanning modes .Ob-jective evaluation included image noise and signal to noise ratio .The subjective evaluation was done by 2 radiologists indepen-dently.Radiation dose statistics using the device comes with the data.[Result]The image quality score (2.21 ±0.58)in group A was lower than that in group B (2 .66 ±0 .21),and the difference was statistically significant (P<0 .05).There was no obvious difference in objective image quality.The scanning time of group A (2.3 ±0.10)s,was more shortened than in the group B (7 .8 ± 0 .90)s,the difference was statistically significant (P<0 .01);radiation dose in group A (2 .9 ± 0 .6) mSv,compared with group B (3.8 ±0.7)mSv,was statistically significant different (P<0.01).[Conclusion]Dual source CT Flash pitch scanning mode of thoracic and abdominal aorta,aortic could get clear image,could meet the diagnosis of ab-dominal aortic disease;shorten scan time,lower radiation dose,so it has high clinical application value in the emergency aorta scan .
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