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眶部肌锥外间隙疾病的HR-MRI表现

实用放射学杂志 2004年第12期20卷 1063-1068页

作者：周全,刘斯润,黄力,arne-jrn lemke 广东广州510632 广东广州510632 暨南大学附属第一医院医学影像中心暨南大学附属第一医院医学影像中心暨南大学附属第一医院医学影像中心 Department of Radiology Virchow-Hospital Charité Humboldt-University Berlin13353 Germany 广东广州510632

目的　总结眶部肌锥外间隙疾病的HR -MRI影像表现 ,以提高对其进行鉴别诊断的能力。方法　对诊断明确的 44例累及眶部肌锥外间隙病变的位置、形态、大小、边缘、范围、邻近结构及磁共振信号的变化情况进行回顾性分析。磁共振扫描采用 1.... 详细信息

目的　总结眶部肌锥外间隙疾病的HR -MRI影像表现 ,以提高对其进行鉴别诊断的能力。方法　对诊断明确的 44例累及眶部肌锥外间隙病变的位置、形态、大小、边缘、范围、邻近结构及磁共振信号的变化情况进行回顾性分析。磁共振扫描采用 1.5TGESigna及SiemensMagnetomSp63磁共振扫描机 ,用眶部表面线圈 ,SE系列常规轴位、冠状位及矢状位扫描 ,2 1例行脂肪抑制扫描、41例行增强扫描。结果　眶部淋巴瘤、血管瘤、炎性假瘤、横纹肌肉瘤及转移瘤等占此区病变总数的 70 %。 3例血管瘤表现为圆形、边缘清楚的肿块 ,眶部淋巴瘤多为边界不清、不规则形的大病灶 ,转移瘤及横纹肌肉瘤多为圆形、边界不清的病灶。淋巴瘤的占位推移效应不明显而更多是对邻近结构的浸润与侵犯。淋巴管瘤MRI信号表现为特征性的无强化的短T1长T2 信号 ,黑色素转移瘤具有特征性的短T1短T2 信号 ,3例血管瘤的强化明显而不同于其他肿瘤。横纹肌肉瘤发病的平均年龄为 7岁 ,5 0 %转移瘤具有明确的先前原发肿瘤病史 ,3例炎性假瘤均对激素治疗敏感。结论　病变位置、MRI信号及形态学特征、临床病史及占位效应对眶部疾病的鉴别诊断有重要作用。

关键词：眶部肿瘤肌锥外间隙磁共振成像

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眼球孤立性脉络膜血管瘤的HR-MRI表现

临床放射学杂志 2004年第6期23卷 463-466页

作者：周全陈金城刘斯润黄力 arne-jrn lemke 暨南大学附属第一医院医学影像中心广州510632 Department of Radiology Virchow-Hospital Charité Humboldt-University

目的　探讨眼球孤立性脉络膜血管瘤的高分辨率磁共振 (HR MRI)影像学特征 ,进一步提高诊断水平。资料与方法　回顾性分析诊断明确的孤立性脉络膜血管瘤 16例共计 17个病灶的位置、数目、形态、大小、MRI信号、强化情况、有无合并视网膜... 详细信息

目的　探讨眼球孤立性脉络膜血管瘤的高分辨率磁共振 (HR MRI)影像学特征 ,进一步提高诊断水平。资料与方法　回顾性分析诊断明确的孤立性脉络膜血管瘤 16例共计 17个病灶的位置、数目、形态、大小、MRI信号、强化情况、有无合并视网膜脱离及有无视神经和眼外侵犯等。所有病例均行HR MRI及增强扫描 ,部分病例行脂肪抑制。结果　 17个病灶中的 16个呈扁丘状位于眼球内壁的后极。 15个病灶厚度 <5mm ,平均厚度为2 .9mm。病灶边缘清晰 ,T1WI上呈轻度高信号者 16个 ,T2 WI上呈等信号者 15个 ,增强扫描显著强化者有 12个。 3例合并视网膜脱离 ,在T2 WI上多呈等信号 ,T1WI上呈轻度高信号者 ,均无强化。无视神经及眼外侵犯病例。结论　 94 %孤立性脉络膜血管瘤的HR MRI表现具有特征性 ,表现为位于眼球内壁后极的较小、基底较宽、边缘清晰的扁丘状病灶。其T1WI信号高于玻璃体 ,T2 WI信号等于玻璃体 ,增强扫描瘤体显著强化。明确其HR MRI影像学特征有助于临床与恶性葡萄膜黑色素瘤相鉴别。

关键词：脉络膜疾病血管瘤高分辨力磁共振成像眶部表面线圈

HR-MRI信号强度的改变在眼眶部疾病诊断中的作用

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暨南大学学报（自然科学与医学版） 2005年第4期26卷 538-545页

作者：周全刘斯润黄力陈金城 arne-jrn lemke 暨南大学附属第一医院医学影像中心广东广州510632 洪堡大学CharitéVirchow医院医学影像科德国柏林13353

目的:总结眼眶部疾病的HR-MRI影像表现,主要明确其HR-MRI信号强度的改变在眼眶部疾病诊断中的作用,以提高对其进行鉴别诊断的能力。方法:对诊断明确的208例眼眶部疾病的位置及其磁共振信号的变化情况进行回顾性分析。磁共振扫描采用1.5 ... 详细信息

目的:总结眼眶部疾病的HR-MRI影像表现,主要明确其HR-MRI信号强度的改变在眼眶部疾病诊断中的作用,以提高对其进行鉴别诊断的能力。方法:对诊断明确的208例眼眶部疾病的位置及其磁共振信号的变化情况进行回顾性分析。磁共振扫描采用1.5 T磁共振扫描机,用眶部表面线圈进行高分辨率扫描,SE及FSE系列常规轴位、冠状位及(或)矢状位扫描,72例行脂肪抑制扫描1、65例行增强扫描。结果:眼眶部可以被分成8区,各区有其各自的好发疾病。眼眶部疾病的MRI信号征象大致可分为4种信号表现。骨膜下区的皮样囊肿及亚急性骨膜下出血、肌锥外区的淋巴管瘤在T1WI及T2WI均为高信号;眼部脉络膜黑色素瘤在T1WI为高信号,T2WI为低信号;骨膜下区及视神经区的脑膜瘤在T1WI及T2WI均为等信号;大部分病变在T1WI为等低信号,T2WI为高信号。结论:MRI信号对眶部疾病的鉴别诊断有重要作用。结合病变的位置、发病年龄,根据MRI信号可以对大多数眼眶部肿瘤做出定性诊断。

关键词：高分辨率磁共振表面线圈眶部肿瘤信号特征

眶部肌锥外间隙非霍奇金淋巴瘤的高分辨率MRI表现

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中华放射学杂志 2005年第3期39卷 248-251页

作者：周全刘斯润黄力 Ame-jm lemke 暨南大学附属第一医院医学影像中心 Department of Radiology Virchow-HospitalCharitéHumboldt-UniversityBerlin13353Germany

目的探讨眶部肌锥外间隙非霍奇金淋巴瘤(NHL)的高分辨率MR(HR-MR)成像特征.方法回顾性分析16例经病理诊断明确的眶部肌锥外间隙NHL病灶的位置、数目、形态、大小、MRI信号及其对邻近结构侵犯等.MR扫描采用1.5 T MR扫描机,眼眶部表面线圈... 详细信息

目的探讨眶部肌锥外间隙非霍奇金淋巴瘤(NHL)的高分辨率MR(HR-MR)成像特征.方法回顾性分析16例经病理诊断明确的眶部肌锥外间隙NHL病灶的位置、数目、形态、大小、MRI信号及其对邻近结构侵犯等.MR扫描采用1.5 T MR扫描机,眼眶部表面线圈,SE及快速SE(FSE)序列常规横轴面或冠状面及斜矢状面扫描,全部病例行脂肪抑制技术.全部病例均行增强扫描及HR-MRI检查.结果 16例中的13例病灶位于肌锥外间隙的前上份,紧靠眶隔的后方,呈不规则的长条状铸型改变;其余3例为弥漫性病变,累及眶部肌锥外间隙,呈不规则形.11个病灶的体积>3 cm3, 4个病灶的体积为中等大小(1～3 cm3),只有1例病灶<1 cm3.13例病灶边缘不清晰并浸润眼外肌但不推移眼外肌; 7例浸润眼球壁,仅3例眼球突出,2例弥漫性病变者伴有骨质破坏.与肌肉比较,所有16例病灶T1WI均为等信号, T2WI表现为高信号13例,等信号3例;所有16例病灶均有强化,15例为均匀强化,10例为明显强化.结论眶部肌锥外间隙NHL的HR-MRI表现具有一定的特征性,表现为铸型生长、位于肌锥外间隙的前份,紧靠眶隔的后方、病灶边缘欠清晰并浸润,但不推移眼外肌,T1WI信号等于肌肉、T2WI信号高于肌肉、增强扫描病灶呈明显强化.眶部肌锥外间隙NHL的HR-MR影像学特征有助于临床与其他眶部占位相鉴别.

关键词：病灶 NHL MRI表现非霍奇金淋巴瘤眼外肌弥漫性病变浸润扫描机信号清晰

Violent collisions can reveal hexadecapole deformation of nuclei

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Nuclear Science and Techniques 2024年第7期35卷 1-3页

作者： Björn Schenke Physics Department Brookhaven National LaboratoryUptonNY 11973USA

A new observable in heavy ion collision experiments was identified to be sensitive to the hexadecapole deformation of the colliding *** deformation is difficult to measure in traditional nuclear electric transition measurements,as it is often overwhelmed by the nuclear quadrupole *** opens the door to gain new insight into nuclear structure with experiments that were designed to study hot and dense nuclear matter.

关键词： deformation collision insight

Impact of scandium and terbium on the mechanical properties,corrosion behavior,and biocompatibility of biodegradable Mg-Zn-Zr-Mn alloys

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journal of Magnesium and Alloys 2024年第2期12卷 546-572页

作者： Khurram Munir jixing Lin Xian Tong arne Biesiekierski Yuncang Li Cuie Wen School of Engineering RMIT UniversityMelbourneVictoria 3001Australia School and Hospital of Stomatology Wenzhou Medical UniversityWenzhou 325027China

Magnesium(Mg)-based bone implants degrade rapidly in the physiological environment of the human body which affects their structural integrity and biocompatibility before adequate bone *** earth elements(REEs)have demonstrated their effectiveness in tailoring the corrosion and mechanical behavior of Mg *** study methodically investigated the impacts of scandium(Sc)and terbium(Tb)in tailoring the corrosion resistance,mechanical properties,and biocompatibility of Mg–0.5Zn–0.35Zr–0.15Mn(MZZM)alloys fabricated via casting and hot *** indicate that addition of Sc and Tb improved the strength of MZZM alloys via grain size reduction and solid solution strengthening *** extruded MZZM–(1–2)Sc–(1–2)Tb(wt.%)alloys exhibit compressive strengths within the range of 336–405 MPa,surpassing the minimum required strength of 200 MPa for bone implants by a significant *** polarization tests revealed low corrosion rates of as–cast MZZM(0.25 mm/y),MZZM–2Tb(0.45 mm/y),MZZM–1Sc–1Tb(0.18 mm/y),and MZZM–1Sc–2Tb(0.64 mm/y),and extruded MZZM(0.17 mm/y),MZZM–1Sc(0.15 mm/y),MZZM-2Sc(0.45 mm/y),MZZM-1Tb(0.17 mm/y),MZZM-2Tb(0.10 mm/y),MZZM–1Sc-1Tb(0.14 mm/y),MZZM-1Sc-2Tb(0.40 mm/y),and MZZM–2Sc–2Tb(0.51 mm/y)alloys,which were found lower compared to corrosion rate of high-purity Mg(~1.0 mm/y)reported in the ***,addition of Sc,or Tb,or Sc and Tb to MZZM alloys did not adversely affect the viability of SaOS2 cells,but enhanced their initial cell attachment,proliferation,and spreading shown via polygonal shapes and *** study emphasizes the benefits of incorporating Sc and Tb elements in MZZM alloys,as they effectively enhance corrosion resistance,mechanical properties,and biocompatibility simultaneously.

关键词： Corrosion property In vitro cytotoxicity Magnesium alloys Mechanical property Rare earth elements

Audio Enhancement for Computer Audition—An Iterative Training Paradigm Using Sample Importance

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journal of Computer Science & Technology 2024年第4期39卷 895-911页

作者： Manuel Milling Shuo Liu Andreas Triantafyllopoulos Ilhan Aslan Björn W.Schuller Chair of Embedded Intelligence for Health Care and Wellbeing University of AugsburgAugsburg 86159Germany Chair of Health Informatics München rechts der IsarTechnical University of MunichMunich 81675Germany Munich Center for Machine Learning Munich 80333Germany Huawei Technologies MunichMunich 80992Germany Munich Data Science Institute Garching 85748Germany Group on Language Audio and MusicImperial College LondonLondon SW72AZU.K.

Neural network models for audio tasks,such as automatic speech recognition(ASR)and acoustic scene classification(ASC),are susceptible to noise contamination for real-life *** improve audio quality,an enhancement module,which can be developed independently,is explicitly used at the front-end of the target audio *** this paper,we present an end-to-end learning solution to jointly optimise the models for audio enhancement(AE)and the subsequent *** guide the optimisation of the AE module towards a target application,and especially to overcome difficult samples,we make use of the sample-wise performance measure as an indication of sample *** experiments,we consider four representative applications to evaluate our training paradigm,i.e.,ASR,speech command recognition(SCR),speech emotion recognition(SER),and *** applications are associated with speech and nonspeech tasks concerning semantic and non-semantic features,transient and global information,and the experimental results indicate that our proposed approach can considerably boost the noise robustness of the models,especially at low signal-to-noise ratios,for a wide range of computer audition tasks in everyday-life noisy environments.

关键词： audio enhancement computer audition joint optimisation multi-task learning voice suppression

Violent collisions can reveal hexadecapole deformation of nuclei

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Nuclear Science and Techniques 2024年第7期 70-72页

作者： Bj?rn Schenke Physics Department Brookhaven National Laboratory

A new observable in heavy ion collision experiments was identified to be sensitive to the hexadecapole deformation of the colliding nuclei. Such deformation is difficult to measure in traditional nuclear electric transition measurements, as it is often overwhelmed by the nuclear quadrupole deformation. This opens the door to gain new insight into nuclear structure with experiments that were designed to study hot and dense nuclear *** structures are determined by the nuclear force, providing fundamental insight into the laws of nature. Deformations,quantifiedbydeviationsfromasphericalshape,area consequence of the interaction between the nuclear shell structure and the residual valence nucleons, whose detailed knowledge is crucial for understanding for example nucleosynthesis,nuclearfission,andneutrinolessdouble-beta decay.

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Development of bismuth-based solutions for well plugging and abandonment:A review

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Petroleum Research 2024年第2期9卷 250-264页

作者： Lewaa Hmadeh Marcelo Anunciação jaculli Behzad Elahifar Sigbjørn Sangesland Norwegian University of Science and Technology PTSValgrindaS.P.Andersens veg 15 ANorway

Plugging and abandonment(P&A)is a crucial step of the well life *** of how long one stretches the productive life of a well,P&A operations will have to be carried out *** current panorama of our industry includes many wells to be plugged and abandoned,with steep requirements to abide by both regulations and societal *** this context,we must guarantee that no leakage occurs with an eternal perspective in *** has been the prime material for this task,but recent studies have indicated the potential of degradation over time-especially in corrosive environments-and the creation of leaking paths due to its *** has opened up a path toward the usage of alternative *** of the emerging candidates is bismuth,a metal with the unique characteristic of expanding when *** a trait could improve the overall sealability of wellbores and especially during P&*** article discusses the current status of bismuth sealing technologies,introducing the basics of bismuth,the ongoing efforts to qualify it as a barrier material,its potential applications,and the challenges that still need to be *** latest research indicates promising results in terms of its usage as a barrier element.

关键词： Bismuth plugs Bismuth-tin alloys Well plugging and abandonment Well integrity