目的 分析自适应迭代低剂量双 期扫描在甲状腺CT检查中的可行性。方法 采用前瞻性研究，收集经彩色多普勒超声 诊断为甲状腺结节的80例患者作为研究对 象，按就诊顺序编号，前40人先行常规双 期扫描作为对照组，后40人设定3组不同 的管电压随机行自适应迭代低剂量双期扫 描作为实验组，测定图像噪声，信噪比， 客观评价图像质量。结果 甲状腺AIDR低 剂量双期扫描图像质量与常规扫描无差 异，信噪比、噪声比对比差异无统计学意 义(P>0.05)，以80Kv ADIR低剂量扫描辐 射剂量最低。结论 在甲状腺CT检查中采 用多排螺旋CT自适应迭代低剂量双期扫 描，不仅成像质量好，同时可降低辐射剂 量，提高扫描的安全性，其中以80Kv低电 压ADIR低剂量扫描为最优条件。

Objective To analyze the feasibility of adaptive iterative low-dose dual-phase scanning in thyroid CT examination. Methods A prospective study was conducted on 80 cases of patients with thyroid nodules diagnosed by color Doppler ultrasound. According to the order of treatment, the first 40 patients undergoing conventional dual-phase scanning were included into the control group while the latter 40 patients undergoing adaptive iterative low-dose dual-phase scanning by randomly setting 3 groups of different tube voltages were included into the experimental group. The image noise and signal to noise ratio (SNR) were determined, and the image quality was evaluated objectively. Results There was no significant difference in the image quality of thyroid low-dose AIDR dual-phase scanning and conventional scanning, and there was no significant difference in SNR and noise ratio (P>0.05). The radiation dose of 80Kv ADIR lowdose scanning was the lowest. Conclusion The application of dual-phase multi-slice spiral CT adaptive iterative low-dose scanning in thyroid CT examination not only can obtain good image quality but also can reduce the radiation dose and improve the safety of scanning, and 80Kv low-voltage ADIR low-dose scanning was the optimal condition.