Acta Academiae Medicinae Sinica

Acta Academiae Medicinae Sinica

Acta Academiae Medicinae Sinica ›› 2017, Vol. 39 ›› Issue (1): 42-48.doi: 10.3881/j.issn.1000-503X.2017.01.008

• Orginal Article • Previous Articles     Next Articles

Application of 70 kV Third-generation High-pitch Dual-source Coronary CT Angiography in Patients with Different Body Mass Index

Yan YI, Jian CAO, Lu LIN, Lingyan KONG, Shu JIANG, Xiao LI, Peijun LIU, Ming WANG, Man WANG, Yun WANG, Zhengyu JIN, Yining WANG()   

  1. Department of Radiology,PUMC Hospital,CAMS and PUMC,Beijing 100730,China
  • Received:2016-07-20 Online:2017-02-10 Published:2017-02-20
  • Supported by:
    Supported by the National Natural Sciences Foundation of China (81471725),the Beijing Municipal Natural Science Foundation (7142133),and the Health Industry Special Scientific Research Project (201402019,201402001)

Abstract:

Objective To investigate the optimized range of body mass index (BMI) selection for patients undergoing 70 kV high-pitch dual-source coronary CT angiography (CCTA) on the third-generation dual-source CT (DSCT). Methods Patients undergoing prospective high-pitch ultra-low contrast media (CM) CCTA on the third-generation DSCT using the automatic tube voltage selection at 70 kV were included and divided into three groups:group A,with BMI≤24 kg/m2;group B,with 24 kg/m22;and group C,with BMI≥28 kg/m2. The baseline data,image quality results,and effective dose (ED) were evaluated and compared. Results No significant difference was found in age (H=2.36,P=0.78),heart rate (H=3.51,P=0.80),and ED(H=1.77,P=0.12) among three groups. The noise of the aortic root in group A was (21.66±4.00)HU,which was significantly lower than that in group C [(23.61±4.20)HU](F=2.05,P=0.03). The signal to noise ratio of aortic root in group A (18.61±5.28) was significantly better than that in group C (14.75±2.58) (F=5.31,P=0.02). No other significant difference in quantitative image quality were found among the three groups (all P >0.05). Subjective image quality in group A(Z=2.91,P=0.004) and B(Z=2.27,P=0.021) were both significantly better than that in group C. Conclusion The ultra-low tube voltage (70 kV) combined with ultra-low CM CCTA protocol on third-generation high-pitch DSCT may be better for patients with BMI<28 kg/m2 than those with BMI ≥28 kg/m2 in China.

Key words: body mass index, coronary CT angiography, third-generation dual-source CT, radiation dose, imagine quality

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