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肺癌患者重复性CT检查剂量水平调查与影响因素分析 被引量:3
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作者 殷志杰 钟子淇 +2 位作者 翟贺争 王帅 李祥林 《放射学实践》 CSCD 北大核心 2021年第5期653-657,共5页
目的:调查和分析肺癌患者重复性CT检查所致辐射剂量水平的影响因素,为后续累积剂量优化研究提供参考。方法:应用PACS系统,检索2015年10月至2018年10月一直在滨州医学院附属医院随诊的26例症状稳定且不可手术的Ⅲ期原发性非小细胞肺癌患... 目的:调查和分析肺癌患者重复性CT检查所致辐射剂量水平的影响因素,为后续累积剂量优化研究提供参考。方法:应用PACS系统,检索2015年10月至2018年10月一直在滨州医学院附属医院随诊的26例症状稳定且不可手术的Ⅲ期原发性非小细胞肺癌患者的CT检查数据。依据《中国临床肿瘤学会(CSCO)原发性肺癌诊疗指南》判断临床医师对诊疗规范的依从性;计算26例患者的有效剂量,统计非胸部CT检查的有效剂量占比;依据《医学影像检查技术学》判断非电离辐射检查替代的可行性,从影像检查策略方面分析剂量影响因素。依据《X射线计算机断层摄影成年人诊断参考水平》设计剂量核查方案,结合《CT检查技术专家共识》从CT检查操作方面分析剂量影响因素。结果:影像检查策略方面,26例患者以肺癌随访为目的的CT扫描次数范围为4~38次,检查策略符合诊疗规范的建议;26例患者的CT检查所致有效剂量的范围为19.04~470.73 mSv;非胸部CT检查所致有效剂量的范围为0~202.35 mSv,占总有效剂量的比例范围为0%~53%,存在非电离辐射检查替代的可行性。检查操作方面,不同设备的各检查部位CTDIvol、DLP数值均存在超过规定诊断参考水平的情况;胸部CT扫描范围不符合建议范围的占比为31.67%。结论:全面、系统的CT检查辐射剂量数据分析有助于后续CT累积剂量优化研究。 展开更多
关键词 肺肿瘤 重复性CT检查 累积有效剂量 剂量核查 辐射剂量优化
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基于DXF文件的图形元素重复性检测方法研究与实现
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作者 袁义 常智勇 +1 位作者 莫蓉 杨海成 《制造业自动化》 北大核心 2007年第7期4-8,共5页
使用大型笔式数控绘图机绘图时,在DXF文件中存在图形元素完全或部分重合的情况下,会产生绘图光顺性差、精度低、无效行程大等问题,针对此种情况,本文提出了对直线、圆弧和圆等常见图形元素进行重复性检查的优化算法;本算法有效的减少了... 使用大型笔式数控绘图机绘图时,在DXF文件中存在图形元素完全或部分重合的情况下,会产生绘图光顺性差、精度低、无效行程大等问题,针对此种情况,本文提出了对直线、圆弧和圆等常见图形元素进行重复性检查的优化算法;本算法有效的减少了绘图机抬笔次数,提高了绘图精度,缩短了无效行程,已在工程中得到成功应用。 展开更多
关键词 DXF文件 重复性检查 优化
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^(13)C-methacetin breath test reproducibility study reveals persistent CYP1A2 stimulation on repeat examinations 被引量:1
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作者 Anna Kasicka-Jonderko Anna Nita +2 位作者 Krzysztof Jonderko Magdalena Kamińska Barbara Bońska-Fajfrowska 《World Journal of Gastroenterology》 SCIE CAS CSCD 2011年第45期4979-4986,共8页
AIM: To find the most reproducible quantitative parameter of a standard 13C-methacetin breath test (13C-MBT). METHODS: Twenty healthy volunteers (10 female, 10 male) underwent the 13C-MBT after intake of 75 mg 13C-met... AIM: To find the most reproducible quantitative parameter of a standard 13C-methacetin breath test (13C-MBT). METHODS: Twenty healthy volunteers (10 female, 10 male) underwent the 13C-MBT after intake of 75 mg 13C-methacetin p.o. on three occasions. Short-and medium-term reproducibility was assessed with paired examinations taken at an interval of 2 and 18 d (medians), respectively. RESULTS: The reproducibility of the 1-h cumulative 13C recovery (AUC0-60), characterized by a coefficient of variation of 10%, appeared to be considerably better than the reproducibility of the maximum momentary 13C recovery or the time of reaching it. Remarkably, as opposed to the short gap between consecutive examinations, the capacity of the liver to handle 13C-methacetin increased slightly but statistically significantly when a repeat dose was administered after two to three weeks.Regarding the AUC0-60, the magnitude of this fixed bias amounted to 7.5%. Neither the time gap between the repeat examinations nor the gender of the subjects affected the 13C-MBT reproducibility. CONCLUSION: 13C-MBT is most reproducibly quantified by the cumulative 13C recovery, but the exactitude thereof may be modestly affected by persistent stimulation of CYP1A2 on repeat examinations. 展开更多
关键词 13C-Methacetin Breath test Isotope application in medicine Liver REPRODUCIBILITY
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Long Term Reproducibility Check of a Full Field Digital Mammography System
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作者 Francesca Pietrobon Salvatore Panarello +2 位作者 Orazio De Toffol Marco Toigo Elena Bellan 《Journal of Physical Science and Application》 2016年第5期42-53,共12页
In this study different types of customized phantoms were used to examine a long term reproducibility check of a full field digital mammography system. These phantoms can be distinguished into three types: a PMMA (p... In this study different types of customized phantoms were used to examine a long term reproducibility check of a full field digital mammography system. These phantoms can be distinguished into three types: a PMMA (polimethylmethacrylate) object for an easy signal-to-noise ratio measurement in a defined region, a phantom with particular details of various dimensions (TORMAS) and a phantom for a contrast-detail analysis (CDMAM). In our center the ARTINIS ANALYZER software has been used since 2011 to weekly perform a CDMAM phantom analysis. This soitware is based on the original CDCOM algorithm suggested by the EUREF, the European Reference Organization for assured quality breast screening and diagnostic services. However the CDMAM phantom is a contrast-detail object designed for image quality type tests and not for long term reproducibility control. Since 2013, as suggested by the guidelines of Veneto region, a TORMAS weekly acquisition and analysis of data has also been performed. The purpose of this study is to discuss the data obtained by using the two different detail phantoms, CDMAM and TORMAS. These results can provide some correlations among the analyzed parameters comparing them with the ones emerging from the PMMA phantom analysis. The study reveals that the basic PMMA phantom is the object that provides the necessary information about the stability of the exposure parameters and the reproducibility of a mammographic equipment in terms of image quality indexes. 展开更多
关键词 Contrast-detail phantoms digital mammography long-term reproducibility.
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