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学科主题: 放射科学
题名:
自动管电压调制技术参考毫安秒对胸部CT平扫图像质量和辐射剂量的影响
其他题名: Effect of reference mAs in CARE kV technique on image quality and radiation dose in unenhanced chest CT
作者: 王晓华; 张艳; 袁慧书
关键词: 体层摄影术,X线计算机 ; 辐射剂量 ; Tomography,X-ray computed ; Radiation dosage
刊名: 中华放射学杂志
发表日期: 2015
DOI: 10.3760/cma.j.issn.1005-1201.2015.03.005
卷: 49, 期:3, 页:179-182
收录类别: 中国科技核心期刊 ; 中文核心期刊 ; CSCD
文章类型: Journal Article
摘要: 目的 对比自动、实时调整X线管电流技术(CARE Dose4D),评估自动管电压调制技术(CARE kV)中参考毫安秒对胸部平扫CT图像质量和辐射剂量的影响.方法 连续选取2012年12月至2013年2月进行胸部CT平扫患者158例,按检查日期(每连续11个工作日为1组)分为5组:采用CARE Dose4D技术(30例,组1);采用CARE kV技术,参考管电流分别为110(32例)、90(31例)、70(33例)、50 mAs(32例),分别记为组2~组5.计算5组患者的容积CT剂量指数(CTDIvol)、剂量长度乘积(DLP)和有效剂量(ED);在肺实质和降主动脉区测量CT值和客观噪声.2名放射科医师评估图像的主观噪声、伪影和诊断的可接受性.图像的辐射剂量、CT值和客观噪声的比较采用单因素方差分析(ANOVA),多组间两两比较采用SNK检验;主观图像质量评分采用Kruskal-Wallis检验,多组间两两比较采用K-W检验.结果 组1至组5患者的CTDIvol分别为(7.7±1.7)、(7.7±2.0)、(5.5±1.4)、(4.2±1.5)、(2.8±1.2) mGy,DLP分别为(290.7±67.4)、(290.1±85.2)、(194.2±52.1)、(150.7±63.8)、(96.5±38.9) mGy· cm,ED值分别为(4.1±0.9)、(4.1±1.2)、(2.7±0.7)、(2.1±0.9)、(1.3±0.5)mSv,5组间各参数比较差异均有统计学意义(F值分别为59.305、57.760、57.760,P值均<0.01),随着参考mAs的降低,辐射剂量明显下降.5组患者间肺实质和降主动脉测量的CT值差异无统计学意义(F值分别为0.353和0.102,P值均>0.05);组1至组5患者肺实质的客观噪声分别为(48.7±9.1)、(49.2±10.0)、(55.5±11.2)、(56.5±8.3)、(63.7±13.2)HU,降主动脉的客观噪声分别为(9.2±1.6)、(9.5±2.1)、(10.7±2.6)、(1 1.6±2.7)、(13.6±2.6)HU,5组间比较差异均有统计学意义(F值分别为10.774和17.157,P值均<0.01).5组图像主观噪声的等级评估差异有统计学意义(U=33.967,P<0.01);而对运动、条状、斑点状伪影和图像诊断可接受性的等级评价差异无统计学意义(U值分别为8.847、2.054、6.186和5.296,P值均>0.05).结论 与CARE Dose4D技术相比,在胸部CT平扫检查中使用合适参考毫安秒的CARE kV技术能在明显减低辐射剂量的同时获得诊断可接受的图像质量. Objective To evaluate the effect of reference mAs on radiation dose and image quality characteristics of chest CT scanned with CARE kV technique compared with CARE Dose4D.Methods According to the date of examination,158 consecutive patients were selected in our department and randomly divided into 5 groups:CARE Dose4D group (30 cases,group 1); using CARE kV technology,reference mAs were 110 (32 cases),90 (31 cases),70 (33 cases),50 (32 cases),which were recorded asthe group from 2 to 5,respectively.Volume CT dose index (CTDIvol),dose length product (DLP) and the effective dose (ED) were analyzed.CT value and objective image noise were measured in the lungparenchyma and descending aorta.Two radiologists assessed the images for subjective noise,artefacts and diagnostic acceptability.The radiation dose,CT value and objective noise were compared with the analysis of variance,and the difference between two groups was compared with SNK test; the rank sum tests (Kruskal-Wallis) were used in subjective image quality score,and difference between two groups was compared with K-W test.Results The CTDIvol,DLP,ED values in five groups were (7.7±1.7),(7.7±2.0),(5.5±1.4),(4.2±1.5),(2.8±1.2)mGy,(290.7±67.4),(290.1±85.2),(194.2±52.1),(150.7±63.8),(96.5±38.9) mGy· cm,(4.1±0.9),(4.1±1.2),(2.7±0.7),(2.1 ± 0.9),(1.3±0.5) mSv,respectively.There were significant difference among the 5 groups(F=59.305,57.76,57.76,P<0.01).With the decrease of the reference mAs,the radiation dose decreased significantly.There were no significant difference among the 5 groups on the average CT values of lung parenchyma and descending aorta(F=0.353,0.102,P>0.05).The objective noise of 5 groups in pulmonary parenchyma and the descending aorta were (48.7 ± 9.1),(49.2 ± 10.0),(55.5± 11.2),(56.5± 8.3),(63.7 ± 13.2) HU; (9.2± 1.6),(9.5 ± 2.1),(10.7 ± 2.6),(11.6 ± 2.7),(13.6 ± 2.6) HU respectively,and the difference was significant(F=10.774,17.157,P<0.01).Level assessment onsubjective noise of five groups by radiological expertsalso showed the significant difference (U=33.967,P<0.01),butthe evaluation on motion,streak,blotchy pixellatedartefacts and diagnostic acceptability had no statistical difference (U=8.847,2.054,6.186,5.296,P>0.05).Conclusion Comparedwith CARE Dose4D,the use of CARE kV technique of suitable reference mAs for unenhanced chest CT can reduce radiation dose significantly with diagnostically acceptable image quality.
语种: 中文
原文出处: 查看原文
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内容类型: 期刊论文
URI标识: http://ir.bjmu.edu.cn/handle/400002259/69341
Appears in Collections:北京大学第三临床医学院_放射科_期刊论文

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作者单位: 100191,北京大学第三医院放射科

Recommended Citation:
王晓华,张艳,袁慧书. 自动管电压调制技术参考毫安秒对胸部CT平扫图像质量和辐射剂量的影响[J]. 中华放射学杂志,2015,49(3):179-182.
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