| 袁子龙,郑丽丽,杜东屏,张照喜,陈长春,周俊芬,彭伟,刘玉林.探讨胸部正侧位定位像在CT CARE Dose 4D技术中降低成人患者辐射剂量的临床价值[J].中华放射医学与防护杂志,2016,36(6):461-464 |
| 探讨胸部正侧位定位像在CT CARE Dose 4D技术中降低成人患者辐射剂量的临床价值 |
| Study of adult chest CT using care dose 4D combined with anteroposterior and lateral localizer radiographs |
| 投稿时间：2015-11-02 |
| DOI：10.3760/cma.j.issn.0254-5098.2016.06.013 |
| 中文关键词: 体层摄影术 X射线计算机 胸部 CARE Dose 4D 辐射剂量 图像质量 |
| 英文关键词:Tomography X-ray computed Chest CARE Dose 4D Radiation dose Image quality |
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| 中文摘要: |
| 目的 探讨胸部正侧位定位像在CT CARE Dose 4D技术中进一步降低成人患者辐射剂量的应用价值和意义。方法 选取胸部CT平扫病例120例,按随机数字表法分为两组,每组60例;试验组使用胸部正侧位定位像定位,对照组使用正位定位像定位,两组均使用CARE Dose 4D技术扫描;记录两组病例的CTDIvol、DLP及图像噪声,同时由2位医师按双盲法对两组病例图像质量行5分制评分;比较两组病例的CTDIvol、DLP、图像噪声的差异,对两位医师主观评分进行χ2检验,并用Kappa检验,检验两位医生主观评价结果上的一致性。结果 试验组和对照组病例的平均CTDIvol和DLP分别为(5.11±0.87)、(6.56±1.74)mGy和(159.58±30.65)、(211.5±65.89)mGy·cm,差异有统计学意义(t=-5.75、-5.88,P<0.05);胸锁关节、气管分叉、左心室水平图像平均噪声值:试验组为12.6±1.8、10.9±1.4、11.1±1.8,对照组为11.5±1.7、10.5±1.6、10.9±1.9,其中在胸锁关节水平两组图噪声值差异有统计学意义(t=5.03,P<0.05),气管分叉、左心室水平噪声差异无统计学意义(P>0.05)。两组病例主观图像质量评分均达到临床诊断要求,2名医师的评估结果一致(χ2=1.37,P>0.05)。结论 成人胸部CT扫描在CARE Dose 4D技术下,通过使用正侧位定位像可以在保证图像质量的同时,进一步降低患者辐射剂量,对临床有一定的应用价值。 |
| 英文摘要: |
| Objective To explore the application value and significance of anteroposterior and lateral localizer radiographs in reducing the radiation dose in adult chest CT with CARE Dose 4D technique. Methods Totally 120 patients undergoing chest CT scan were randomly divided into 2 groups (test group and control group, with 60 cases in each group) according to random nuber table. anteroposterior and lateral localizer radiographs were performed for experimental group and anteroposterior localizer radiograph for control group, both being scanned with CARE Dose 4D technique. CTDIvol, DLP, image noise and subjective image quality in two groups were recorded and compared.Results Averages of CTDIvol and DLP were (5.11±0.87) and (159.58±30.65) mGy·cm in test group, and (6.56±1.74) and(211.5±65.89)mGy·cm in control group, respectively. Compared with control group, average CTDIvol decreased by 1.45 mGy (22.1%) and average DLP decreased by 51.92 mGy (24.5%) in test group,with statistically significant differences (t=-5.75,-5.88,P<0.05). Image noise levels were 12.6±1.8 in sternoclavicular joint, 10.9±1.4 in tracheal bifurcation and 11.1±1.8 in left ventricular in test group, and 11.5±1.7 in sternoclavicular joint, 10.5±1.6 in tracheal bifurcation, 10.9±1.9 in left ventricular in control group, respectively. Noise values at acromioclavicular joint level between two groups were statistically significant (t=5.03,P<0.05), but not in bifurcation of trachea and left ventricular (P>0.05). Subjective image quality scores in two groups were consistent with the requirements of clinical diagnosis(χ2=1.37,P>0.05). Conclusions Adult chest CT scan with anteroposterior and lateral localizer radiographs using CARE Dose 4D technology can guarantee image quality while further reducing the radiation dose to patients. |
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