低管电压、低浓度碘对比剂（双低）在头颈 CTA 检查中的应用

目的：探讨低管电压、低浓度碘对比剂(双低)在头颈 CT 血管造影(CTA)检查中的应用效果。方法选取60例行头颈 CTA 检查的健康志愿者作为研究对象，并随机分为双低组和常规组，每组30例，双低组采用低管电压、低浓度碘对比剂头颈 CTA 检查，常规组实施常规 CTA 检查，比较两组受检者的图像质量、CT 值等级、辐射剂量等。结果双低组不同兴趣区(ROI)的 CT 值与常规组差异无统计学意义(P >0．05)；双低组在右大脑中动脉、左大脑中动脉中的图像质量评分稍低于常规组(P <0．05)；在其他 ROI 中，两组的图像质量评分比较，差异无统计学意义(P >0．05)；两组图像质量的主观评分结果差异无统计学意义(P >0．05)；双低组的体型特异性剂量估计值、剂量长度乘积值均显著低于常规组(P <0．05)。结论使用低管电压、低浓度对比剂进行头颈 CTA 检查，能够在不影响图像质量的基础上降低对比剂用量、减少辐射剂量，具有重要的推广应用价值。

Lower tube voltage,low concentration of iodine contrast agent (double) application in head and neck CTA examination

Objective To investigate the low tube voltag, low concentrations of iodine contrast agent (double low) application results in the head-neck CT angiography (CTA) examination. Methods Sixty volunteers, selected as research objects to receive CTA, were randomly divided into a double-low test group and a conventional test group, with 30 volunteers in each group. For the double-low test group, the head-neck CTA examination was conducted by means of lower tube voltage and lower-concentration iodinated contrast agent, while the conventional test group was given conventional CTA examination. After the examination, the two groups were mutually compared in terms of im-age quality, CT value level, radiation dose, and so on. Results Two different groups interested in the low zone (ROI) and conventional CT values had no differences (P > 0. 05); double low set in the right middle cerebral ar-tery, the left middle cerebral artery in image quality score was slightly lower than that of the conventional group (P< 0. 05); ROI in the other two groups of image quality scores and subjective image quality scores, there was no significant difference (P > 0. 05); SSDE double low group, DLP values were significantly lower than that of the conventional group(P < 0. 05). Conclusion The use of lower tube voltage and lower-concentration contrast agent for the head-neck CTA examination can, without affecting image quality, reduce the dose of contrast agent and that of radiation, thus being worthy of application and promotion.