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采用深度学习对放射线自由文本报告进行分类

国际医学放射学杂志 2018年第3期 342-342页

作者： M.C.Chen R.L.ball L.Yang N.Moradzadeh b.E.Chapman d.b.larson 吕晓虹 department of Radiology Stanford University School of Medicine Stanford University Medical Center

摘要目的分析2所机构胸部CT有关肺栓塞(PE)的报告,与传统的自然语言处理(NLP)模型对比,评估深度学习卷积神经网络(CNN)模型的性能。材料与方法纳入1998年

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深度学习神经网络模型评估小儿手部X线片骨骼成熟度的性能

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国际医学放射学杂志 2018年第3期 358-358页

作者： d.b.larson M.C.Chen M.P.Lungren S.S.Halabi N.V.Stence C.P.Langlotz 孙鹤 department of Radiology Stanford University School of Medicine

摘要目的比较基于手部X线片的深度学习骨龄评估模型与放射科专家及现有的自动化模型的性能。材料与方法本研究经伦理委员会批准。共从2所儿童医院获得了

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美国页岩油气地质特征及勘探开发进展

石油勘探与开发 2024年第4期51卷 807-828页

作者： MCMAHON T P larson T E ZHANG T SHUSTER M 美国德克萨斯大学奥斯汀分校杰克逊地质科学学院经济地质局奥斯汀78758-4445德克萨斯州美国

基于美国页岩油气勘探开发历程的回顾,对主要页岩盆地的地质演化、主要页岩层系的油气地质特征及勘探开发进展进行系统梳理和总结。美国重要页岩盆地的富烃页岩主要发育于6个地质时期:中奥陶世、中—晚泥盆世、早石炭世(中—晚密西西比... 详细信息

基于美国页岩油气勘探开发历程的回顾,对主要页岩盆地的地质演化、主要页岩层系的油气地质特征及勘探开发进展进行系统梳理和总结。美国重要页岩盆地的富烃页岩主要发育于6个地质时期:中奥陶世、中—晚泥盆世、早石炭世(中—晚密西西比世)、早二叠世、晚侏罗世和晚白垩世(塞诺曼期—土伦期),构造沉积环境主要包括克拉通内盆地、前陆盆地和被动大陆边缘盆地。古生界富烃页岩主要分布于以下6个盆地:阿巴拉契亚盆地(尤蒂卡页岩和马塞勒斯页岩)、阿纳达科盆地(伍德福德页岩)、威利斯顿盆地(巴肯页岩)、阿卡马盆地(费耶特维尔页岩)、沃思堡盆地(巴内特页岩)和二叠盆地(狼营组和斯帕瑞组/骨泉组页岩)。中生界富烃页岩主要发育在西墨西哥湾盆地(海恩斯维尔组和鹰滩组)和落基山盆地群(以丹佛和粉河盆地的尼尔布拉勒组页岩为主)。通过对各页岩区带的详细分析发现,页岩的岩相和矿物成分存在差异,“页岩储层”并非只是页岩,很多情况下页岩油气还产自粉砂岩和碳酸盐岩等多种岩石类型。美国的页岩油气资源丰富,页岩油地质资源量超过0.246×1012 t,页岩气地质资源量超过290×1012 m3。在开启“页岩革命”的水平井水力压裂技术出现之前,美国经过了长达20年的勘探开发实践和理论技术积累。自2007年至2023年,美国页岩油气产量从约11.2×104t/d油当量增加到超过300.0×104t/d油当量,2017年页岩油气产量超过了常规油气,2023年在油气总产量中的占比增加到60%以上。页岩油气的开发主要得益于钻完井技术的改进,“立体开发”的攻关,以及重复压裂、提高原油采收率和“U”形井等技术的应用。基于美国丰富的页岩资源基础和技术的不断进步,页岩油气的产量将继续为全美的油气生产做出更大贡献。

关键词：美国页岩油页岩气页岩储层非常规储层油气产量资源评价

The magnetosheath at high spectral resolution

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Earth and Planetary Physics 2024年第1期8卷 234-246页

作者： K.d.Küntz d.Koutroumpa W.R.dunn A.Foster F.S.Porter d.G.Sibeck b.Walsh The Henry A.Rowland department of Physics and Astronomy Johns Hopkins University3701 San Martin DriveBaltimoreMD21218USA NASA Goddard Space Flight Center 8800 Greenbelt RoadGreenbeltMD 20771USA LATMOS-OVSQ CNRSUVSQ Paris-SaclaySorbonne Université11 Boulevard d’Alembert78280GuyancourtFrance department of Physics and Astronomy University College LondonLondonUK The Centre for Planetary Science at UCL/birkbeck Gower StreetLondon WC1E 6BTUK Center for Astrophysics Harvard University&Smithsonian Institution60 Garden StreetCambridgeMA 02138USA Center for Space Physics Boston University110 Cummington MallBostonMAUSA

While we eagerly anticipate SMILE’s(Solar wind Magnetosphere Ionosphere Link Explorer)unprecedented X-ray observations of the Earth’s magnetosheath and the initiation of a new era of magnetospheric research,it seems appropriate to look ahead to the abilities of the next generation of astrophysics *** these,the Line Emission Mapper(LEM),a large aperture micro-calorimeter based mission,is currently planned to be able to observe the magnetosheath at high spectral resolution(~2 eV).With a field of view of~30′,LEM will allow higher spatial resolution and higher cadence measurement of the motion of a very small portion of the magnetopause over relatively short periods of time(multiple hours),complementing SMILE’s global ***’s strength is its spectral *** will be able to measure the abundance of a broad range of elements and ionization states,many of which are inaccessible to current in situ instruments,and will be able to separate the emission from the magnetosheath from the emission from the cosmic X-ray background using the difference in their relative velocities.

关键词： magnetosheath charge exchange solar wind abundances

Additively manufactured Ti–Ta–Cu alloys for the next-generation load-bearing implants

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International Journal of Extreme Manufacturing 2024年第1期6卷 353-374页

作者： Amit bandyopadhyay Indranath Mitra Sushant Ciliveri Jose d Avila William dernell Stuart b Goodman Susmita bose W.M.Keck biomedical Materials Research Laboratory School of Mechanical and Materials EngineeringWashington State UniversityPullmanWA 99164United States of America Veterinary Clinical Sciences College of Veterinary MedicineWashington State UniversityPullmanWA 99164United States of America department of Orthopedic Surgery Stanford University Medical CenterRedwood CityCA 94063United States of America

bacterial colonization of orthopedic implants is one of the leading causes of failure and clinical complexities for load-bearing metallic implants. Topical or systemic administration of antibiotics may not offer the most efficient defense against colonization, especially in the case of secondary infection, leading to surgical removal of implants and in some cases even limbs. In this study, laser powder bed fusion was implemented to fabricate Ti3Al2V alloy by a 1:1 weight mixture of CpTi and Ti6Al4V powders. Ti-Tantalum(Ta)–Copper(Cu) alloys were further analyzed by the addition of Ta and Cu into the Ti3Al2V custom alloy. The biological,mechanical, and tribo-biocorrosion properties of Ti3Al2V alloy were evaluated. A 10 wt.% Ta(10Ta) and 3 wt.% Cu(3Cu) were added to the Ti3Al2V alloy to enhance biocompatibility and impart inherent bacterial resistance. Additively manufactured implants were investigated for resistance against Pseudomonas aeruginosa and Staphylococcus aureus strains of bacteria for up to 48 h. A 3 wt.% Cu addition to Ti3Al2V displayed improved antibacterial efficacy, i.e.78%–86% with respect to CpTi. Mechanical properties for Ti3Al2V–10Ta–3Cu alloy were evaluated, demonstrating excellent fatigue resistance, exceptional shear strength, and improved tribological and tribo-biocorrosion characteristics when compared to Ti6Al4V. In vivo studies using a rat distal femur model revealed improved early-stage osseointegration for alloys with10 wt.% Ta addition compared to CpTi and Ti6Al4V. The 3 wt.% Cu-added compositions displayed biocompatibility and no adverse infammatory response in vivo. Our results establish the Ti3Al2V–10Ta–3Cu alloy’s synergistic effect on improving both in vivo biocompatibility and microbial resistance for the next generation of load-bearing metallic implants.

关键词： Ti6Al4V load-bearing implants additive manufacturing 3d printing antibacterial performance

阑尾直径作为儿童阑尾炎的一种预测指标:提高了由logistics预测模型衍生而来的三分类法的诊断率

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国际医学放射学杂志 2015年第5期 501-501页

作者： A.T.Trout A.J.Towbin S.R.Fierke b.Zhang d.b.larson 李伟 Cincinnati Children ’s Hospital Medical Center

摘要目的开发和评估针对儿科阑尾炎超声诊断的基于直径的logistic预测模型以及由此衍生的三分类法的效能。方法阑尾直径引自儿童及青少年超声检查报告。数值用以产生一个logistics预测模型以定义阴性、可疑以及阳性共3种分类。衍生而来... 详细信息

摘要目的开发和评估针对儿科阑尾炎超声诊断的基于直径的logistic预测模型以及由此衍生的三分类法的效能。方法阑尾直径引自儿童及青少年超声检查报告。数值用以产生一个logistics预测模型以定义阴性、可疑以及阳性共3种分类。衍生而来的三分类法的诊断效能与假定的二分类法对比。结果 641例阑尾超声报告回顾评审有181例诊断为

关键词：阑尾阑尾炎超声肠疾病情报检索分类法数学模型预测模型 logistics

Chemical-assisted MMP reduction on methane-oil systems:Implications for natural gas injection to enhanced oil recovery

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Petroleum 2024年第1期10卷 101-108页

作者： Mohamed Almobarak Matthew b.Myers Colin d.Wood Yongbing Liu Ali Saeedi Quan Xie discipline of Petroleum Engineering WA School of Mines: Minerals Energy and Chemical Engineering Curtin University Commonwealth Scientific and Industrial Research Organization Curtin University Oil and Gas Innovation Centre Management State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation

Miscible natural gas injection is widely considered as a practical and efficient enhanced oil recovery technique. However, the main challenge in this process is the high minimum miscibility pressure（MMP）between natural gas and crude oil, which limits its application and recovery factor, especially in hightemperature reservoirs. Therefore, we present a novel investigation to quantify the effect of chemicalassisted MMP reduction on the oil recovery factor. Firstly, we measured the interfacial tension（IFT） of the methane-oil system in the presence of chemical or CO2to calculate the MMP reduction at a constant temperature（373K） using the vanishing interfacial tension（VIT） method. Afterwards, we performed three coreflooding experiments to quantify the effect of MMP reduction on the oil recovery factor under different injection *** interfacial tension measurements show that adding a small fraction（1.5 wt%） of the tested surfactant（SOLOTERRA ME-6） achieved 9% of MMP reduction, while adding 20 wt% of CO2to the methane yields 13% of MMP reduction. Then, the coreflooding results highlight the significance of achieving miscibility during gas injection, as the ultimate recovery factor increased from 65.5% under immiscible conditions to 77.2% using chemical-assisted methane, and to 79% using gas mixture after achieving near miscible condition. The results demonstrate the promising potential of the MMP reduction to significantly increase the oil recovery factor during gas injection. Furthermore, these results will likely expand the application envelop of the miscible gas injection, in addition to the environmental benefits of utilizing the produced gas by re-injection/recycling instead of flaring which contributes to reducing the greenhouse gas emissions.

关键词： Gas injection Enhanced oil recovery Miscibility Coreflooding

通过全科室标准化结构报告的使用来提高放射报告的一致性

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国际医学放射学杂志 2013年第3期 280-280页

作者： d.b.larson A.J.Towbin R.M.Pryor L.F.donnelly 钱方达 department of Radiology Cincinnati Children's Hospital Medical Center

目的成功开发一个全科室的标准化结构报告程序,并实现放射科的广泛采用。材料与方法于2010年2月成立了一个结构化的报告工作小组,负责为一所有36名放射科医生的三级保健儿童医院开发标准化结构化的报告。委员会在报告组达成了共识,并为... 详细信息

目的成功开发一个全科室的标准化结构报告程序,并实现放射科的广泛采用。材料与方法于2010年2月成立了一个结构化的报告工作小组,负责为一所有36名放射科医生的三级保健儿童医院开发标准化结构化的报告。委员会在报告组达成了共识,并为每位代表提供了书写指南及代表不同部分的目录,以助于结构化报告的创建。由亚专业组审核后起草报告和修订,直到报告的作者同意。使用该报告的所有放射科医生都将审核每一份报告,并进行进一步适当的修订。然后报告进入语音识别系统,使每一个报告与放射信息系统的程序代码或一组编码形成联系。这将使语音识别系统自动报告成为可能。2011年9月完成了最初稿。按季度进行审计,以评估报告格式是否遵循标准,评估放射科医生认为检查结果正常的报告是否正常使用。2012年8月,就放射科医生对结构化报告程序的印象进行了调查。结果在项目启动后2年内,根据收集的212000份中相关的199000份研究报告,共创建了228份标准化结构化报告。到2011年9月实施期结束为止,全部223份(100%)审计报告均符合标准的报告格式,并且81份中的80份(99%)报告符合正常报告。放射科医生的反馈总体上是好的。结论全科标准化结构报告,放射科医生认可率很高,可以在放射科应用。

关键词：结构化报告所有报告格式科室放射科

基于影像质量的可检测CT辐射剂量最优化系统第二部分:过程控制系统

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国际医学放射学杂志 2013年第6期 585-585页

作者： d.b.larson R.J.Malarik S.M.Hall d.J.Podberesky 刘莹莹 department of Radiology Stanford University School of Medicine 300 Pasteur Dr Stanford CA 94305-5105

摘要目的评价CT在胸部、腹部和骨盆检查中,辐射剂量优化和过程控制系统对于影像噪声和体型特异性剂量估计(SSdE)一致性的效果。材料与方法这个质量改进项目不

关键词：辐射剂量噪声噪音过程控制系统 CT