X-CARE技术在女性胸部CT检查中的应用  

Application of X-CARE technique in chest CT of women

作　　者：李骋[1] 高丰[1] 李铭[1,2] 毛定飚[1] 吴昊[1] 葛虓俊[1] 郑向鹏[2] 

机构地区：[1]复旦大学附属华东医院放射科,上海200040 [2]复旦大学附属华东医院肺微小结节诊治中心,上海200040

出　　处：《放射学实践》2016年第3期271-274,共4页Radiologic Practice

基　　金：国家自然科学基金(81472794);申康医院发展中心课题(SHDC22015025);复旦大学附属华东医院骨干人才计划项目(HDGG2014011)

摘　　要：目的:评估X-CARE技术在女性胸部CT检查中的应用价值。方法:将体检人群中行胸部CT检查的130例女性受检者随机等分为对照组和实验组,对照组采用常规低剂量螺旋CT扫描(100kV、40mAs),实验组采用相同条件并同时使用X-CARE技术。测量两组图像肺尖层面左侧胸大肌、隆突层面降主动脉及左心房的平均CT值、噪声(SD),计算信噪比(SNR)与对比噪声比(CNR)。两名放射科医师采用5分制对图像质量进行评价,并将结果进行比较;计算并比较两组CT容积剂量指数(CTDIvol)、剂量长度乘积(DLP)及有效剂量(ED)。结果:两组图像质量均能完全满足临床诊断需求,两名医师对图像质量的评估具有较好一致性(Kappa=0.775)。对照组和实验组肺尖层面左侧胸大肌、隆突层面降主动脉、左心房的平均CT值分别为(64.10±9.73)、(40.33±5.52)、(39.49±5.04)HU和(60.06±11.30)、(40.05±5.88)和(39.43±5.24)HU;两组SD分别为(11.99±3.23)、(8.04±2.21)、(7.95±2.18)和(10.43±2.90)、(8.20±1.86)、(8.24±1.97);SNR分别为(5.64±1.38)、(5.37±1.57)、(5.29±1.49)和(6.06±1.73)、(5.13±1.36)、(5.04±1.35);CNR分别为(2.12±1.07)和(1.48±0.81),两组间差异均无统计学意义(P均>0.05)。结论:采用X-CARE技术进行女性胸部CT检查能在减少女性乳腺受到直接辐射的同时保证很好的图像质量,具有很高的临床应用价值。Objective：To evaluate the application value of X-CARE technique in chest CT of women.Methods：One hundred and thirty women undergoing chest CT during health screening were randomly divided into two groups（study group and control group）.The control group underwent low dose spiral CT scanning with tube voltage as 100 kv and tube current as 40 mAs,the study group used X-CARE technique with the same scanning parameters.The mean CT value,image noise（SD）,signal to noise ratio（SNR）and contrast to noise ratio（CNR）of left pectoral muscle at the level of lung apex,descending aorta at the level of carina and left atrium of the two groups were measured and calculated.The image quality was evaluated by two radiologists using a 5point scoring system and the results were compared.The volume CT dose index（CTDIvol）,dose length product（DLP）and the effective dose（ED）were calculated and compared.Results：The image quality of the two groups can fully satisfy the requirement of clinical diagnosis,with good consistency between the two radiologists（Kappa=0.775）.The mean CT value of the three locations in the two groups were（64.10±9.73）HU,（40.33±5.52）HU and（60.06±11.30）HU,（40.05±5.88）HU,（39.43±5.24）HU respectively,with no statistically significant difference（P0.05）.Of the two groups,the SD at the left pectoral muscle of lung apex,the descending aorta at the level of carina and left atrium was（11.99±3.23）,（8.04±2.21）,（7.95±2.18）and（10.43±2.90）,（8.20±1.86）,（8.24±1.97）respectively;the SNR was（5.64±1.38）,（5.37±1.57）,（5.29±1.49）and（6.06±1.73）,（5.13±1.36）（5.04±1.35）respectively;the CNR was（2.12±1.07）and（1.48±0.81）respectively,with no statistical difference（all P0.05）.Conclusion：Using X-CARE technique for chest CT in women can reduce direct radiation exposure of breasts with good image quality,which has significant value in clinical application.

关 键 词：X线 辐射剂量 辐射防护 

分 类 号：R816.4[医药卫生—放射医学]