摘要目的 探讨自动管电流技术联合迭代算法在颈部CT扫描中的应用价值.方法 连续收集行颈部CT扫描(平扫+增强)的患者80例,按随机数表法分为实验组和对照组,各40例.实验组平扫、增强均采用自动管电流技术+迭代算法重建,对照组平扫、增强均采用固定管电流200 mAs+滤波反投影法重建.对两组平扫、增强图像均进行主观评分、客观评价[甲状腺、斜方肌、胸锁乳突肌、颌下腺、翼外肌、脑组织的噪声值(SD)].比较两组的有效剂量(E).结果 实验组平扫、增强的E均低于对照组,差异有统计学意义(t=-2.451、-2.451,P<0.05).实验组平扫、增强图像主观评分均高于对照组,差异有统计学意义(Z=-1.969、-2.056,P<0.05);实验组平扫、增强图像甲状腺、斜方肌、胸锁乳突肌、颌下腺的SD均低于对照组,差异有统计学意义(t=2.400、2.516、2.120、2.411、4.134、4.674、2.711、2.892,P<0.05).两组平扫、增强图像翼外肌、脑组织的SD差异均无统计学意义(P>0.05).结论 自动管电流技术联合迭代算法在颈部CT扫描中,在提高图像质量的同时,可有效降低辐射剂量.

abstractsObjective To explore application of automatic tube current modulation combined with iterative reconstruction in CT scanning ( non-enhanced and enhanced) of neck. Methods A total of 80 patients with CT scanning of neck were randomly divided into test group(n=40, automatic tube current modulation, iterative reconstruction ) and control group ( n = 40, 200 mAs, filtered-back-projection reconstruction ) . Subjective scores and objective evaluation of two groups were evaluated. Evaluation included image noise ( SD ) of thyroid gland, trapezius muscle, sternocleidomastoid muscle, submandibular gland, lateral pterygoid muscle and brain tissue. Effective dose ( E ) was compared. Results The E of non-enhanced and enhanced scanning in test group was lower than that of control group with the statistically significant difference(t = -2. 451, -2. 451, P <0. 05). The subjective scores of non-enhanced and enhanced scanning in test group were higher than those of control group with the statistically significant difference (Z = - 1.969, - 2.056, P < 0.05), while SD of thyroid gland, trapezius muscle, sternocleidomastoid muscle, submandibular gland in test group were lower than that of control group with the statistically significant difference ( t =2. 400,2. 516,2. 120,2. 411,4. 134,4. 674, 2. 711,2. 892, P<0. 05). There were no significant differences in SD of lateral pterygoid muscle, brain tissue of non-enhanced and enhanced scanning between two groups (P>0. 05). Conclusions Automatic tube current modulation combined with iterative reconstruction in CT scanning of neck could improve image quality, and reduce effectively radiation dose.