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A pilot clinical study of developing an External Assist Targeting Device for rapid and precise renal calyx access during percutaneous nephrolithotomy

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Asian Journal of Urology 2023年第3期10卷 364-371页

作者： Qinghui Wu Kesavan Esuvaranathan Teck Kheng Lee Soo Leong Foo Jian Ping Chai edmund Chiong Department of Urology National University HospitalSingapore Department of Surgery National University of SingaporeSingapore Institute of Technical Education Technology Development CentreSingapore Invivo Medical Pte.Ltd. Singapore

Objective:To design a device to increase the accuracy of the targeting process and reduce the radiation exposure to both the patients and the medical ***:We analyzed the inherent problem and designed the External Assist Targeting Device(EATD)to assist in the alignment of needle targeting on the desired renal calyx under fluoroscopic *** EATD was designed to allow rapid and precise access to calyces at all angles,with a simple two-step puncture protocol developed for puncturing a target renal *** then tested the device in a pilot human trial with four ***:In experiments with phantom models,the time for successful targeting was reduced by 31%using the *** mean fluoroscopic time was reduced by 40%.In initial human trial,the puncture time was shortened by 66%and the radiation dose was decreased by 65%compared to free-hand *** complication was observed during the ***:The EATD was found to be cost effective,portable,simple to set up,and safe to operate for assisting in the percutaneous nephrolithotomy *** preliminary tests showed high degree of accuracy in gaining precise access to a targeted renal calyx with much shorter time and lesser radiation *** EATD also has the potential to be used to access other organs with precision under fluoroscopic guidance.

关键词： Percutaneous nephrolithotomy Kidney puncture Renal calculi Targeting device Fluoroscopy guidance

Virtual reality based multiple life skill training for intellectual disability:A multicenter randomized controlled trial

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Engineered Regeneration 2022年第2期3卷 121-130页

作者： James Chung-Wai cheung Ming Ni Andy Yiu-Chau Tam Tim Tin-Chun Chan Alyssa Ka-Yan cheung Ocean Yu-Hong Tsang Chi-Bun Yip Wing-Kai Lam Duo Wai-Chi Wong Department of Biomedical Engineering Faculty of EngineeringThe Hong Kong Polytechnic UniversityHong Kong 999077China Research Institute for Smart Ageing The Hong Kong Polytechnic UniversityHong Kong 999077China Jockey Club Smart Ageing Hub Department of Biomedical EngineeringFaculty of EngineeringThe Hong Kong Polytechnic UniversityHong Kong 999077China Department of Orthopaedics Pudong New Area People’s Hospital Affiliated to Shanghai Jiaotong UniversityShanghai 201299China Social Service Department Yan Chai HospitalHong Kong 999077China C2 Innovations and Research Limited Hong Kong 999077China Department of Kinesiology Shenyang Sport UniversityShenyang 110102China Sports Information and External Affairs Centre Hong Kong Sports InstituteHong Kong 999077China

Life skill-based training is essential for intellectual disabled individuals to regain autonomy and social *** reality(VR)could deliver a nascent application that is more engaging and *** objective of this study was to evaluate the training effects of the VR-based multiple life skill training program on life skill perfor-mance,self-efficacy,memory,cognitive and behavioral functions via a multicenter randomized controlled trial.A total of 145 intellectual disabled participants were recruited for a randomized controlled trial with three in-tervention arms:VR(n=42);traditional(n=53);and control(n=50).The life skill tasks for the interventions included 1)grocery shopping,2)cooking,and 3)kitchen *** measures were performance scores for the three tasks,self-efficacy scale,digit span score,and Frontal Assessment Battery score,graded by blinded ***-after effects of each group were evaluated using separated Wilcoxon Signed-rank *** sig-nificantly improved cooking,cleaning performance,and memory span,while traditional training significantly improved shopping,cooking,and cleaning *** generalized estimating equation evaluated effects between groups adjusted for age,gender and intelligence quotient(IQ).VR had significantly larger improvement effects in cooking and cleaning than the control group and memory span compared to traditional training and controls *** appeared to be a significant confounder on the training *** work may consider developing artificial intelligence to customize programs depending on IQ level.

关键词： Mental retardation Intellectual development X-reality Immersive rehabilitation Metaverse

Acquisition repeatability of MRI radiomics features in the head and neck:a dual-3D-sequence multi-scan study

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Visual Computing for Industry,Biomedicine,and Art 2022年第1期5卷 115-127页

作者： Cindy Xue Jing Yuan Yihang Zhou Oi Lei Wong Kin Yin cheung Siu Ki Yu Research Department Hong Kong Sanatorium&HospitalHong KongChina Medical Physics Department Hong Kong Sanatorium&HospitalHong KongChina

Radiomics has increasingly been investigated as a potential biomarker in quantitative imaging to facilitate personalized diagnosis and treatment of head and neck cancer(HNC),a group of malignancies associated with high ***,the feature reliability of radiomics is a major obstacle to its broad validity and generality in application to the highly heterogeneous head and neck(HN)*** particular,feature repeatability of radiomics in magnetic resonance imaging(MRI)acquisition,which is considered a crucial confounding factor of radiomics feature reliability,is still sparsely *** study prospectively investigated the acquisition repeatability of 93 MRI radiomics features in ten HN tissues of 15 healthy volunteers,aiming for potential magnetic resonance-guided radiotherapy(MRgRT)treatment of *** subject underwent four MRI acquisitions with MRgRT treatment position and immobilization using two pulse sequences of 3D T1-weighed turbo spin-echo and 3D T2-weighed turbo spin-echo on a 1.5T MRI *** repeatability of radiomics feature acquisition was evaluated in terms of the intraclass correlation coefficient(ICC),whereas within-subject acquisition variability was evaluated in terms of the coefficient of variation(CV).The results showed that MRI radiomics features exhibited heterogeneous acquisition variability and uncertainty dependent on feature types,tissues,and pulse *** a small fraction of features showed excellent acquisition repeatability(ICC>0.9)and low within-subject *** MRI scans improved the accuracy and confidence of the identification of reliable features concerning MRI acquisition compared to simple test-retest repeated *** study contributes to the literature on the reliability of radiomics features with respect to MRI acquisition and the selection of reliable radiomics features for use in modeling in future HNC MRgRT applications.

关键词： Radiomics Magnetic resonance guided radiotherapy Head and neck Repeatability Intraclass correlation coefficient

Echocardiographic evaluation of right ventricular function in congenital heart disease

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Chinese Medical Journal 2014年第21期127卷 3789-3797页

作者： Yiu-fai cheung Division of Paediatric Cardiology Department of Paediatrics and Adolescent Medicine Queen Mary Hospital The University of Hong Kong Hong Kong China

Objective This review aims to provide an overview of conventional and novel indices used in clinical and research arenas for evaluation of right ventricular （RV） function in congenital heart diseases with a dual-chambered *** sources Articles cited in this review were selected using PubMed search of publications in English with no date *** search terms included ＂echocardiography＂,＂right ventricle＂,＂RV function＂,＂cardiac function＂,and ＂congenital heart disease＂.Key references were also searched for additional *** selection Articles related to description of echocardiographic techniques in the evaluation of subpulmonary or systemic RV function and their applications in congenital cardiac malformations were retrieved and *** Three approaches have been used to evaluate subpulmonary and systemic RV function：（1） assessment of changes in RV size in the cardiac cycle,（2） determination of Doppler-derived velocities and systolic and diastolic time intervals,and （3） quantification of myocardial velocities and *** Conventional and novel echocardiographic techniques enable the evaluation of subpulmonary and systemic RV *** echocardiographic techniques have further allowed quantification of RV volumes and direct interrogation of myocardial *** new techniques show promise in a more comprehensive evaluation beyond ＂eye-bailing＂ of RV function in the growing population of adolescent and adult congenital heart patients.

关键词： ventricular function congenital heart defects echocardiography

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營養衛教對血液透析患者高血磷的影響

镜湖医学 2024年第1期24卷 34-36页

作者：周惠碧冼詠萱黃懿茵張振榮澳門鏡湖醫院家庭醫學科中国

目的觀察營養衛教對高血磷的血液透析(hemodialysis,HD)患者飲食行為以及血磷水平的影響。方法選取經充分HD治療以及口服降磷藥物治療3個月後平均血磷值仍大於1.78mmol/L的患者,隨機分為研究組和對照組,營養師分别於第2和第4個月對研究... 详细信息

目的觀察營養衛教對高血磷的血液透析(hemodialysis,HD)患者飲食行為以及血磷水平的影響。方法選取經充分HD治療以及口服降磷藥物治療3個月後平均血磷值仍大於1.78mmol/L的患者,隨機分為研究組和對照組,營養師分别於第2和第4個月對研究組患者實施2次一對一個别式高磷血症飲食指導。分析比較衛教前後的知識、態度、行為問卷分數、血磷水平和血磷達標率。結果40例患者資料完整並完成研究,平均年齡64.6±12.1歲,平均每人每週外出用餐6次;75%的患者經常飲用咖啡、奶茶或茶。經衛教干預,研究組患者對加工食品是高磷食物的認知比例由66.7%顯著提升至90.5%(P<0.05);干預後對低磷飲食的知識(P=0.014)評分較干預前明顯提高,行為評分亦見有提高,但未達統計學差異。研究組患者干預後血磷值有下降趨勢,血磷達標率有上升趨勢,但未達統計學差異。結論營養衛教對改善患者對高磷食物的認知以及低磷飲食的知識和行為有一定幫助,但未能改善血磷水平。

关键词：血磷血液透析營養教育飲食行為

The Pioneering Works of Professor Duzheng YE on Atmospheric Dispersion,Tibetan Plateau Meteorology,and Air–Sea Interaction

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Advances in Atmospheric Sciences 2017年第10期34卷 1137-1149页

作者： Ngar-cheung LAU Institute of Environment Energy and Sustainabilityand Department of Geography and Resource ManagementThe Chinese University of Hong KongShatinN.T.Hong Kong

This paper provides an overview of the impacts of the original works of Professor Duzheng YE on a selected set of observational and model studies with which the present author has been associated over the past several decades. The main themes of these works include atmospheric energy dispersion, air–land interactions over the Tibetan Plateau, and El Ni n？orelated air–sea coupling over East *** dispersive behavior of observed atmospheric fluctuations accompanying cold surge events in East Asia is demonstrated. Cold air outbreaks over Korea and southern China are coincident with the successive downstream development of troughs and ridges, with the group velocity of such wave packets being notably faster than the phase propagation speed of individual troughs and ridges. In a more general context, dispersive features are also discernible from lagged teleconnection charts and cross-spectra of observed and model-simulated geopotential height variations on 10–30-day time *** the output from a high-resolution general circulation model, the relative contributions of condensational, sensible, and radiative heating to the atmospheric energy budget over the Tibetan Plateau are documented. The rapid changes of the upper tropospheric Tibetan anticyclone and East Asian mei-yu（＂plum rain＂） precipitation band associated with the development of the Asian monsoon system are *** principal anomalies in sea level pressure, surface wind, precipitation and sea surface temperature over southeastern China and the Philippine Sea region during El Nio events are presented. The contributions of remote El Nio-related forcing and local air–sea interaction to the occurrence of these anomalies are assessed.

关键词： atmospheric dispersion Tibetan Plateau meteorology El Nio

Dual ultra-wideband(UWB)radar-based sleep posture recognition system:Towards ubiquitous sleep monitoring

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再生工程(英文) 2023年第1期4卷 36-43页

作者： Derek Ka-Hei Lai Li-Wen Zha Tommy Yau-Nam Leung Andy Yiu-Chau Tam Bryan Pak-Hei So Hyo-Jung Lim Daphne Sze Ki cheung Duo Wai-Chi Wong James Chung-Wai cheung Department of Biomedical Engineering Faculty of EngineeringThe Hong Kong Polytechnic UniversityHong Kong 999077China Department of Bioengineering Imperial CollegeLondon SW72AZUnited Kingdom Research Institute of Smart Ageing The Hong Kong Polytechnic UniversityHong KongChina School of Nursing The Hong Kong Polytechnic UniversityHong KongChina

Sleep posture monitoring is an essential assessment for obstructive sleep apnea(OSA)*** objective of this study is to develop a machine learning-based sleep posture recognition system using a dual ultra-wideband radar *** collected radiofrequency data from two radars positioned over and at the side of the bed for 16 patients performing four sleep postures(supine,left and right lateral,and prone).We proposed and evaluated deep learning approaches that streamlined feature extraction and classification,and the traditional machine learning approaches that involved different combinations of feature extractors and *** results showed that the dual radar system performed better than either single *** statistical features with random forest classifier yielded the best accuracy(0.887),which could be further improved via an ablation study(0.938).Deep learning approach using transformer yielded accuracy of 0.713.

关键词： Obstructive sleep apnea Deep learning Sleep monitoring Feature extraction Ablation study

Real Estate Politik:Democracy and the Financialization of Social Networks

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Journal of Social Computing 2021年第4期2卷 323-336页

作者： Joanne cheung the Haas School of Business University of CaliforniaBerkeleyCA 94720USA

The power of social network platforms to amplify the scale,speed,and significance of everyday communication is increasingly weaponized against *** of social networks predominantly focus on design and its effects on *** article shifts the debate to their business *** as platform businesses,social networks are privately owned public spaces with structurally limited democratic *** from the history,theory,and practice of land use,I develop an analogy between the financialization of land by commercial real estate development and the financialization of attention by platform *** policies,such as incentive zoning and exclusionary zoning,shed light on how platform businesses use systems of measurement and valuation to conflate users’roles,tokenize the incentives that drive behavior,and defer the ethical responsibilities businesses have to the *** the real estate framing reveals social networks’structural flaws and colonial roots,lessons from urban planning,community land trusts,and Indigenous land stewardship can inform their regulation and *** on the broader effort to embed ethics in the development of technology,I describe possibilities to steward social networks in the public interest.

关键词： social networks social media platform studies financialization urban planning land use

Effective simulation of flexible lateral boundaries in two-and three-dimensional DEM simulations

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Particuology 2008年第6期6卷 483-500页

作者： Geraldine cheung Catherine O'Sullivan Department of Civil and Environmental Engineering Imperial College London

Discrete element method （DEM） models to simulate laboratory element tests play an important role in advancing our understanding of the mechanics of granular material response, including bonded or cemented, particulate materials. Comparisons of the macro-scale response observed in a real physical test and a ＂virtual＂ DEM-simulated test can calibrate or validate DEM models. The detailed, particle scale information provided in the DEM simulation can then be used to develop our understanding of the material behaviour. It is important to accurately model the physical test boundary conditions in these DEM simulations. This paper specifically considers triaxial tests as these tests are commonly used in soil mechanics. In a triaxial test, the test specimen of granular material is enclosed within a flexible latex membrane that allows the material to deform freely during testing, while maintaining a specified stress condition. Triaxial tests can only be realistically simulated in 3D DEM codes, however analogue, 2D, biaxial DEM simulations are also often considered as it is easier to visualize particle interactions in two dimensions. This paper describes algorithms to simulate the lateral boundary conditions imposed by the latex membrane used in physical triaxial tests in both 2D and 3D DEM simulations. The importance of carefully considering the lateral boundary conditions in DEM simulations is illustrated by considering a 2D biaxial test on a specimen of frictional unbonded disks and a 3D triaxial test on a bonded （cemented） specimen of spheres. The comparisons indicate that the lateral boundary conditions have a more significant influence on the local, particle-scale response in comparison with the overall macro-scale observations.

关键词： Triaxial testing Discrete element simulations Boundary conditions