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同步辐射高分辨率衍射光束线的设计(英文)

光学精密工程 2007年第12期15卷 1900-1907页

作者： U pietsch O H seeck Faculty of Physics Siegen UniversityD-57068 SiegenGermany HAsYLAB at DEsY D-22603 HamburgGermany

介绍了第三代同步辐射高分辨率X射线衍射光束线的总体设计。给出了高分辨率衍射的基本原理并描述了获得确定光子能量的近平行高强度X射线光束线所必需的光学元件。特别是用X射线动力学理论,解释了双晶及四次反射晶体单色器。作为一个实... 详细信息

介绍了第三代同步辐射高分辨率X射线衍射光束线的总体设计。给出了高分辨率衍射的基本原理并描述了获得确定光子能量的近平行高强度X射线光束线所必需的光学元件。特别是用X射线动力学理论,解释了双晶及四次反射晶体单色器。作为一个实例,介绍了将于2009年开始在德国汉堡运行的一个新的同步辐射源PETRAⅢ的高分辨率衍射( HighRes)光束线的设置情况。通过优化光学部件,对微米尺寸光束,q空间的分辨减小到Δq=10-5nm-1,光通量大于1011cts/s。

关键词：同步辐射衍射光束线高分辨率

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钆对比剂向健康鼠脑脊液的渗透及其分布:一种进入脑组织的潜在途径

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国际医学放射学杂志 2017年第5期 606-607页

作者： G.Jost T.Frenzel J.Lohrke D.C.Lenhard s.Naganawa H.pietsch 华蓓 MR and CT Contrast Media Research Bayer Pharma AG

摘要目的有研究报道注射多种钆对比剂(GBCA)后,部分(并非全部)GBCA可使特定脑区非增强MRI上显示为高信号。本临床前实验系统性评估GBCA进入脑组织的一条

关键词：脑组织 CsF 对比剂健康鼠脑脊液

MDCT采用不同浓度对比剂(300、370、400mg碘)增强在个体间的比较

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国际医学放射学杂志 2010年第5期 496-497页

作者： F.F.Behrendt H.pietsch G.Jost M.A.sieber s.Keil C.Plumbans 谭艳 Department of Diagnostic Radiology University Hospital RWTH Aachen University

关键词：对比剂 CT 个体间比较碘浓度用法与用量结果重复性

无机械性肠梗阻的婴儿和儿童接受择期肠道手术:试点研究

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世界核心医学期刊文摘（儿科学分册） 2005年第12期1卷 44-45页

作者： Leys C.M. Austin M.T. pietsch J.B. 王经纬 Department of Pediatric surgery Vanderbilt Children's Hospital Vanderbilt University Medical Center Nashville TN 37203 United States

Background/Purpose: Preoperative mechanical bowel preparation (MBP) for elective intestinal operations has been a long accepted practice. However, MBP is often unpleasant and time-consuming for patients, and clinical trials in adults have not shown improved outcomes. We conducted this pilot study to test whether omitting MBP before elective intestinal operations in infants and children would increase the risk of infectious or anastomotic complications. Methods: Retrospective review was performed of 143 patients who had an elective colon or distal small bowel procedure performed at our children’s hospital between 1990 and 2003. Results: Thirty-three patients (No PREP) were managed by a single surgeon who routinely omitted MBP, whereas another 110 patients (PREP) were prepared with enemas, laxatives, or both. Both groups received 24 hours of preoperative dietary restriction to clear liquids and perioperative parenteral antibiotics. The No PREP group had one anastomotic leak and no wound infections, whereas the PREP group had 2 anastomotic leaks and 1 wound infection (P =. 58). These results occurred despite greater duration of antibiotic therapy and incidence of delayed wound closures in the PREP group. Conclusion: The results of this pilot study suggest that omitting MBP before elective intestinal operations in infants and children carries no increased risk of infectious or anastomotic complications. Eliminating MBP may reduce health care costs and inconvenience to patients. These findings warrant a large, prospective, randomized clinical trial to validate our findings and to investigate further the necessity of MBP in the pediatric population.

关键词：机械性肠梗阻肠道手术试点研究肠道准备外科手术儿童医院导泻吻合口临床试验伤口感染

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