CT低管电压对胸痛三联征排查图像质量及辐射剂量的影响  

Influence of CT Low Tube Voltage on Image Quality and Radiation Dose in Patients with Chest Pain

作　　者：王敏[1] 郭美玲[1] 李剑[1] 

机构地区：[1]济宁市第一人民医院CT室,山东济宁272111

出　　处：《中国医学影像学杂志》2013年第9期715-717,719,共4页Chinese Journal of Medical Imaging

摘　　要：目的探讨低管电压对128层螺旋CT急性胸痛三联征排查(TRO)图像质量及辐射剂量的影响。资料与方法 50例临床症状表现为急性胸痛,并行128层螺旋CT回顾性心电门控TRO的患者,随机分为A组(100 kV)、B组(120 kV),每组各25例。采用5分法评价图像质量,测量并计算两组主动脉、肺动脉及冠状动脉的CT值、图像噪声(N)、信噪比(SNR)、对比噪声比(CNR)。记录剂量长度乘积(DLP),计算有效剂量(ED)。比较两组的图像质量和ED。结果两组图像质量评分差异无统计学意义(t=-0.667,P>0.05)。A组主动脉、肺动脉、冠状动脉平均CT值高于B组,差异有统计学意义(t=3.753、2.081、3.755,P<0.05)。两组N、SNR、CNR差异均无统计学意义(t=0.654、0.818、1.357,P>0.05)。A组ED[(7.25±1.53)mSv]明显低于B组[(11.86±2.22)mSv],差异有统计学意义(t=-8.541,P<0.05)。结论低管电压128层螺旋CT的TRO可以在获得满足诊断要求的图像质量的同时,降低辐射剂量,值得推广应用。Purpose To explore the influence of low tube voltage of 128-slice CT on image quality and radiation dose in patients with acute chest pain. Materials and Methods Fifty patients with clinical acute chest pain underwent retrospective ECG-gated TRO on a 128-slice CT scanner. All the patients were randomly divided into group A （100 kV） and group B （120 kV）, with 25 cases in each group. Image quality was scored by 5-point method. CT value, image noise （N）, enhanced signal to noise ratio （SNR）, contrast to noise ratio （CNR） of aorta, pulmonary and coronary of two groups were measured and calculated. Dose length product （DLP） was recorded and radiation dose （ED） was calculated. The image quality and radiation dose of the two groups were comapred. Results Subjective score of image quality had no statistical significance between the two groups （t=- 0.667,P〉0.05）, Average CT value of aorta, pulmonary artery and coronary artery of group A was higher than that of group 13, the difference was statistically significant （t=3.753, 2.081,3.755, P〈0.05）. N, SNR and CNR had no statistically difference between the two groups （t=0.654, 0.818, 1.357, P〉0.05）. ED of group A [（7.25± 1.53） mSv] was significantly lower than that of group B [（11.86±2.22） mSv] （P〈0.05）. Conclusion Low tube voltage 128-slice CT TRO can reduce radiation dose without reducing image quality, which should be widely applied.

关 键 词：胸痛 急性病 体层摄影术 螺旋计算机 管电压 质量控制 辐射剂量 

分 类 号：R445.3[医药卫生—影像医学与核医学] R816.2[医药卫生—诊断学]