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134例癌症病人PET/MR与同一日PET/CT对临床处置影响的初步假设性研究

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国际医学放射学杂志 2014年第1期 79-80页

作者： O.A.Catalano B.R.Rosen d.v.sahani P.F.Hahn A.R.Guimaraes M.G.vangel 王亚 department of Radiology SDN Istituto Ricerca Diagnostica NucleareVia Gianturco 113Naples 80143 Italy

目的比较癌症病人同一日进行的正电子发射体层摄影(PET)/MR与PET/CT的临床作用。方法此回顾性研究符合HIPAA,经伦理委员会批准,均签署知情同意书,其内

关键词： PET/MR 癌症病人临床处置 MR CT

鉴别肝细胞癌病人门静脉血栓的良、恶性:扩散加权MR成像的应用

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国际医学放射学杂志 2010年第2期 171-171页

作者： O.A.Catalano G.Choy P.F.Hahn d.v.sahani 高欣 department of Abdominal and Interventional Radiology and Cancer Center Massachusetts General Hospital55 Fruit StWHT 270BostonMA 02114USA

目的研究扩散加权成像在肝细胞癌病人良、恶性门静脉血栓鉴别中的应用。材料与方法该回顾性研究符合HIPAA法案,获机构审查委员会同意,分析了25例门静脉血栓

关键词：肝细胞癌信号强度加权成像 AdC 静脉血栓病人 MR

迭代重建对于大体型成人的多层螺旋CT中影像质量和辐射剂量的影响

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国际医学放射学杂志 2012年第5期 502-502页

作者： G.S.desai R.N.Uppot A.R.Kambadakone d.v.sahani 唐玉霞 department of Abdominal Imaging and Intervention Massachusetts General HospitalHarvard Medical School55 Fruit StreetWhite 270BostonMA 02114USA

摘要目的比较自适应统计迭代重建(ASiR)和滤波反射重建技术(FBP)用于体质量≥91kg病人时的影像质量和辐射剂量。方法在这项机构审查委员会批准的回顾性研究中,对100例体质量≥91kg[91～181.9kg,平均(107.6±17.4)kg]的成人行单期对比增... 详细信息

摘要目的比较自适应统计迭代重建(ASiR)和滤波反射重建技术(FBP)用于体质量≥91kg病人时的影像质量和辐射剂量。方法在这项机构审查委员会批准的回顾性研究中,对100例体质量≥91kg[91～181.9kg,平均(107.6±17.4)kg]的成人行单期对比增强腹部盆腔CT检查,由2名阅片者双盲进行ASiR和FBP影像质量的主观测量值和辐射剂量分析,影像质量使用主观标准化数值模拟和客观噪声来评估。

关键词：迭代重建 CT 成像质量辐射剂量肥胖

低辐射剂量多层CT自适应统计迭代重建技术(ASIR)诊断尿路结石的研究:辐射剂量可以降低至多少?

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国际医学放射学杂志 2012年第6期 589-589页

作者： N.M.Kulkarni R.N.Uppot B.H.Eisner d.v.sahani 史佳培 departments of Abdominal Imaging and Intervention Massachusetts General Hospital55 fruit Stwhite 270bostonMA02114

摘要目的探讨CT扫描条件(80kv、100kv;管电流:75～150mA)、自适应迭代重建技术(ASIR)对尿路结石病人的影像质量的影响。材料与方法本研究符合HIPAA规定并获得伦理审查委员会批准,前瞻性低剂量CT扫描获得了病人知情同意,

关键词：尿路结石影像质量辐射剂量 ASIR CT

自身免疫性胰腺炎:病程演变、分期、疗效评估及可预测对类固醇激素治疗疗效的CT特征

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国际医学放射学杂志 2009年第2期32卷 178-178页

作者： d.v.sahani N.I.Sainani v.deshpande M.S.Shaikh d.L.Frinkelberg C.F.Castillo 范丽 department of Radiology Massachusetts General Hospital-Harvard Medical School

目的通过CT评价自身免疫性胰腺炎（AIP）形态学特征的演变，确定可预测类固醇激素治疗（CST）效果的影像学特征。方法此符合HIPAA法案的回顾性研究经审查委员会批准。在一组63例AIP病人中，将治疗前进行CT检查的15例（男性12例，女... 详细信息

目的通过CT评价自身免疫性胰腺炎（AIP）形态学特征的演变，确定可预测类固醇激素治疗（CST）效果的影像学特征。方法此符合HIPAA法案的回顾性研究经审查委员会批准。在一组63例AIP病人中，将治疗前进行CT检查的15例（男性12例，女性3例；平均年龄64．7岁，范围30～84岁）病人纳入研究，通过分析胰腺、胰周和胰管的变化来评价病程演变。

关键词：自身免疫性胰腺炎类固醇激素病程演变 CT特征治疗疗效疗效评估预测形态学特征

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A comprehensive investigation on nonlinear vibration and bending characteristics of bio-inspired helicoidal laminated composite structures

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Applied Mathematics and Mechanics(English Edition) 2025年第1期46卷 81-100页

作者： S.SAURABH R.KIRAN d.SINGH R.vAISH v.S.CHAUHAN School of Mechanical and Materials Engineering Indian Institute of Technology Mandi

Bio-inspired helicoidal composite laminates, inspired by the intricate helical structures found in nature, present a promising frontier for enhancing the mechanical properties of structural designs. Hence, this study provides a comprehensive investigation into the nonlinear free vibration and nonlinear bending behavior of bio-inspired composite plates. The inverse hyperbolic shear deformation theory(IHSdT) of plates is employed to characterize the displacement field, with the incorporation of Green-Lagrange nonlinearity. The problem is modeled using the C0finite element method(FEM), and an in-house code is developed in the MATLAB environment to solve it numerically. various helicoidal layup configurations including helicoidal recursive(HR), helicoidal exponential(HE), helicoidal semi-circular(HS), linear helicoidal(LH), and Fibonacci helicoidal(FH)with different layup sequences and quasi-isotropic configurations are studied. The model is validated, and parametric studies are conducted. These studies investigate the effects of layup configurations, side-to-thickness ratio, modulus ratios, boundary conditions, and loading conditions at different load amplitudes on the nonlinear vibration and nonlinear bending behaviors of bio-inspired composite plates. The results show that the laminate sequence exerts a substantial impact on both nonlinear natural frequencies and nonlinear bending behaviors. Moreover, this influence varies across different side-to-thickness ratios and boundary conditions of the bio-inspired composite plate.

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Autoimmune pancreatitis in the context of IgG4-related disease:Review of imaging findings

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World Journal of Gastroenterology 2014年第41期20卷 15177-15189页

作者： Leslie K Lee dushyant v sahani division of Abdominal Imaging and Intervention Department of RadiologyMassachusetts General HospitalHarvard Medical School

Current understanding of autoimmune pancreatitis (AIP) recognizes a histopathological subtype of the disease to fall within the spectrum of IgG4-related disease. Along with clinical, laboratory, and histopathological data, imaging plays an important role in the diagnosis and management of AIP, and more broadly, within the spectrum of IgG4-related disease. In addition to the defined role of imaging in consensus diagnostic protocols, an array of imaging modalities can provide complementary data to address specific clinical concerns. These include contrast-enhanced computed tomography (CT) and magnetic resonance (MR) imaging for pancreatic parenchymal lesion localization and characterization, endoscopic retrograde and magnetic resonance cholangiopancreatography (ERCP and MRCP) to assess for duct involvement, and more recently, positron emission tomography (PET) imaging to assess for extra-pancreatic sites of involvement. While the imaging appearance of AIP varies widely, certain imaging features are more likely to represent AIP than alternate diagnoses, such as pancreatic cancer. While nonspecific, imaging findings which favor a diagnosis of AIP rather than pancreatic cancer include: delayed enhancement of affected pancreas, mild dilatation of the main pancreatic duct over a long segment, the “capsule” and “penetrating duct” signs, and responsiveness to corticosteroid therapy. Systemic, extra-pancreatic sites of involvement are also often seen in AIP and IgG4-related disease, and typically respond to corticosteroid therapy. Imaging by CT, MR, and PET also play a role in the diagnosis and monitoring after treatment of involved sites.

关键词： Autoimmune pancreatitis IgG4-related disease Pancreatic cancer Imaging Computed tomography Magnetic resonance Positron emission tomography Review

Semantic Segmentation of Lumbar vertebrae Using Meijering U-Net(MU-Net)on Spine Magnetic Resonance Images

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Computer Modeling in Engineering & Sciences 2025年第1期142卷 733-757页

作者： Lakshmi S v v Shiloah Elizabeth darmanayagam Sunil Retmin Raj Cyril department of Computer Science and Engineering College of Engineering GuindyAnna UniversityChennai600025India department of Information Technology Madras Institute of TechnologyAnna UniversityChrompetChennai600044India

Lower back pain is one of the most common medical problems in the world and it is experienced by a huge percentage of people *** to its ability to produce a detailed view of the soft tissues,including the spinal cord,nerves,intervertebral discs,and vertebrae,Magnetic Resonance Imaging is thought to be the most effective method for imaging the *** semantic segmentation of vertebrae plays a major role in the diagnostic process of lumbar *** is difficult to semantically partition the vertebrae in Magnetic Resonance Images from the surrounding variety of tissues,including muscles,ligaments,and intervertebral discs.U-Net is a powerful deep-learning architecture to handle the challenges of medical image analysis tasks and achieves high segmentation *** work proposes a modified U-Net architecture namely MU-Net,consisting of the Meijering convolutional layer that incorporates the Meijering filter to perform the semantic segmentation of lumbar vertebrae L1 to L5 and sacral vertebra ***-colour mask images were generated and used as ground truth for training the *** work has been carried out on 1312 images expanded from T1-weighted mid-sagittal MRI images of 515 patients in the Lumbar Spine MRI dataset publicly available from Mendeley *** proposed MU-Net model for the semantic segmentation of the lumbar vertebrae gives better performance with 98.79%of pixel accuracy(PA),98.66%of dice similarity coefficient(dSC),97.36%of Jaccard coefficient,and 92.55%mean Intersection over Union(mean IoU)metrics using the mentioned dataset.

关键词： Computer aided diagnosis(CAd) magnetic resonance imaging(MRI) semantic segmentation lumbar vertebrae deep learning U-Net model

An SPH Framework for Earthquake-Induced Liquefaction Hazard Assessment of Geotechnical Structures

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Computer Modeling in Engineering & Sciences 2025年第1期142卷 251-277页

作者： Sourabh Mhaski G.v.Ramana department of Civil Engineering Indian Institute of Technology DelhiNew Delhi110016India

Earthquake-induced soil liquefaction poses significant risks to the stability of geotechnical structures *** understanding of the liquefaction triggering,and the post-failure large deformation behaviour is essential for designing resilient *** present study develops a Smoothed Particle Hydrodynamics(SPH)framework for earthquake-induced liquefaction hazard assessment of geotechnical *** coupled flowdeformation behaviour of soils subjected to cyclic loading is described using the PM4Sand model implemented in a three-phase,single-layer SPH framework.A staggered discretisation scheme based on the stress particle SPH approach is adopted to minimise numerical inaccuracies caused by zero-energy modes and tensile ***,non-reflecting boundary conditions for seismic analysis of semi-infinite soil domains using the SPH method are *** numerical framework is employed for the analysis of cyclic direct simple shear test,seismic analysis of a level ground site,and liquefaction-induced failure of the Lower San Fernando *** agreement for liquefaction triggering and post-failure behaviour demonstrates that the SPH framework can be utilised to assess the effect of seismic loading on field-scale geotechnical *** present study also serves as the basis for future advancements of the SPH method for applications related to earthquake geotechnical engineering.

关键词： Earthquake seismic liquefaction stress particle PM4Sand smoothed particle hydrodynamics(SPH)