自动管电流调制技术对甲状腺CT图像质量及甲状腺辐射量的影响  

Effect of automatic tube current modulation technique on quality of thyroid CT images and thyroid radiation dose

作　　者：徐列印[1] 周程[1] 邢腾龙 邱维加[1] 何敏丽[1] 陈德勤[1] 

机构地区：[1]桂林医学院附属医院放射科,广西桂林市541001

出　　处：《广西医学》2017年第7期959-960,963,共3页Guangxi Medical Journal

基　　金：广西壮族自治区教育厅基金(KY2016LX222)

摘　　要：目的探讨自动管电流调制(ATCM)技术对甲状腺CT图像质量及甲状腺辐射量的影响。方法将40例甲状腺疾病患者随机分为两组,每组20例,A组行常规扫描,B组应用ATCM扫描。对比两组客观图像质量(噪声值和信噪比)、主观图像质量评分及CT剂量指数。结果两组平扫及增强扫描时胸锁乳突肌、甲状腺结节病灶、正常甲状腺实质的噪声值及胸锁乳突肌信噪比比较,差异均无统计学意义(P均>0.05)。A组主观图像质量评分4分15例,3分5例,B组分别为12例、8例,两组图像质量评分比较,差异无统计学意义(P>0.05);A组CT剂量指数为(28.29±0.44)m Gy,高于B组的(24.61±0.91)m Gy(P<0.005)。结论采用ATCM对甲状腺疾病患者进行扫描,图像质量好,并且能有效降低甲状腺辐射剂量。Objective To explore the effect of automatic tube current modulation（ATCM） technique on the quality of thyroid CT images and the thyroid radiation dose. Methods Forty patients with thyroid diseases were randomly divided into two groups,with 20 cases in each group. Group A underwent routine CT scan while Group B underwent scan with ATCM technique. The objective quality of images（including noise value and signal-to-noise ratio）,subjective quality score of images and CT dose index were compared between the two groups. Results No significant differences were found between the two groups in noise values of cleidomastoid,thyroid nodules and thyroid parenchyma,or the signal-to-noise ratio of cleidomastoid（all P〉0. 05）. Fifty cases and 5 cases in Group A achieved 4 scores and 3 scores of subjective quality of images compared to 12 cases and 8 cases in Group B,respectively. There was no significant difference in the quality score of image between the two groups（P〉0. 05）. The CT dose index of Group A was higher than that of Group B（28. 29 ± 0. 44 m Gy vs.24. 61 ± 0. 91 m Gy; P〈0. 05）. Conclusion ATCM technique can obtain good quality of images and significantly reduce the thyroid radiation dose in the scanning for patients with thyroid diseases.

关 键 词：甲状腺疾病 计算机断层摄影术 自动管电流调制 辐射剂量 图像质量 

分 类 号：R581[医药卫生—内分泌] R814.42[医药卫生—内科学]