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目的探讨16排螺旋CT低管电压联合低碘浓度对比剂的双低技术在下肢动脉血管造影中的临床应用价值。方法收集临床怀疑下肢动脉病变拟行CT下肢动脉血管造影患者52例,分为A组(110 k V,350 mg I/ml碘海醇)和B组(80 k V,270 mg I/ml碘克沙醇),记录容积CT剂量指数(CTDIvo1)、剂量长度乘积(DLP)等CT辐射剂量参数,并计算有效剂量(ED),分别测量两组血管增强后腹主动脉末端、腘动脉起始部和胫后动脉末端处的CT值,并计算图像的信噪比(SNR)及对比度噪声比(CNR)。结果两组CTDIvol、DLP及ED差异均有统计学意义(均<0.05);两组血管增强后腹主动脉末端、腘动脉起始部和胫后动脉末端处的CT值、SNR及CNR差异均无统计学意义(均>0.05)。结论低管电压联合低碘浓度对比剂的双低技术CT下肢动脉血管造影,可有效降低患者辐射剂量和对比剂碘含量,而图像质量无影响。
Objective To investigate the clinical value of double-low technique of 16-detector row spiral CT with low iodine contrast agent in lower extremity arterial angiography. Methods Fifty-two patients undergoing CT lower extremity arterial angiography were enrolled in this study. Patients were divided into two groups: group A (110 k V, 350 mg I / ml iohexol) and group B (80 k V, 270 mg I / ml iodine (CTDIvo1), dose length product (DLP) and other CT radiation dose parameters, and calculate the effective dose (ED), were measured after the end of the abdominal aortic vascular enhancement, the beginning of the popliteal artery CT values at the posterior tibial and posterior tibial arteries and calculate the signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR) of the images. Results The differences of CTvolvol, DLP and ED in the two groups were statistically significant (all <0.05). The CT value, SNR and CNR at the distal end of the abdominal aorta, the beginning of the popliteal artery and the posterior tibial artery in both groups were significantly different No statistical significance (all> 0.05). Conclusions Low-voltage CT combined with low-contrast contrast agent with low-contrast CT lower extremity arterial angiography can effectively reduce the patient’s radiation dose and contrast agent iodine content, but has no effect on the image quality.