中华放射医学与防护杂志

袁庆海,刘建华,韩冰,杨哲,弓婷婷.应用80kV管电压降低主动脉CT造影射线剂量初探[J].中华放射医学与防护杂志,2010,30(6):740-743

应用80kV管电压降低主动脉CT造影射线剂量初探

Preliminary research of reducing radiation dose in aortic CT angiography with 80 kV tube kilovoltage

投稿时间：2010-06-10

DOI：

英文关键词:Tomography X-ray computer Radiation dose Signal-noise-ratio Contrast-noise-ratio

基金项目:

作者	单位
袁庆海	130041 长春, 吉林大学第二医院放射线科
刘建华	130041 长春, 吉林大学第二医院放射线科
韩冰	130041 长春, 吉林大学第二医院放射线科
杨哲	130041 长春, 吉林大学第二医院放射线科
弓婷婷	130041 长春, 吉林大学第二医院放射线科

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中文摘要:

目的探讨80kV管电压256层螺旋CT主动脉造影降低射线剂量的可行性。方法对62例疑似主动脉疾病的患者进行主动脉CT造影成像,分为常规管电压扫描组(120kV扫描组)和低管电压扫描组(80kV扫描组),每组31例。然后对两组图像信号噪声比、对比度噪声比和有效剂量进行评估。结果 120与80kV2个扫描组的图像信号噪声比分别为(35.92±5.04)和(33.95±8.30),对比度噪声比分别为(30.32±4.78)和(28.71±7.96),差异均无统计学意义(t =1.131、0.964, P >0.05)。而二组的有效剂量分别为(14.28±0.96)和(9.72±0.81)mSv,差异有统计学意义 (t =20.12, P <0.001)。结论同120kV管电压比较,80kV管电压主动脉CT造影在没有降低图像质量的情况下,射线剂量降低约31.9%,同时降低造影剂剂量50%。

英文摘要:

Objective To evaluate the feasibility of 80 kV tube kilovoltage in aortic artery CT angiography with 256-slice CT. Methods A total of 62 patients undergoing aortic artery CTA were enrolled into this study and divided into conventional tube kilovoltage (120 kV, n =31) and low tube kilovoltage (80 kV, n= 31). The signal-to-noise ratio (SNR), contrast-to-noise ratio (CNR), volume CT dose index (CTDI_vol) and effective dose (E) were evaluated, respectively. Results The mean image SNR was (35.92±5.04) and (33.95±8.30) for conventional tube kilovoltage and low tube kilovoltage, respectively, with no significant difference (t =1.131, P= 0.263). The mean image CNR was (30.32±4.78) and (28.71±7.96) for conventional tube kilovoltage and low tube kilovoltage, respectively, with no significant difference (t =0.964, P= 0.339). The average effective dose (E) was (14.28±0.96)mSv and (9.72±0.81)mSv for conventional tube kilovoltage and low tube kilovoltage, respectively, with significant difference (t =20.12, P <0.001). Conclusions 80 kV tube kilovoltage aortic artery CTA can reduce radiation dose by 31.9%, and contrast dose 50%,and maintain image quality compared with 120 kV tube kilovoltage.

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