Chung-Wai James Cheung

The Hong Kong Polytechnic University | PolyU · Department of Biomedical Engineering

We compared the prediction efficiency of the multiple-joint space width (JSW) and theminimum-JSW on knee osteoarthritis (KOA) severity and progression by using a deep learningapproach. A convolutional neural network (CNN) with ResU-Net architecture was developed forknee X-ray imaging segmentation and has attained a segmentation efficiency of 98.9%...

Ultrasound elastography can quantify stiffness distribution of tissue lesions and complements conventional B-mode ultrasound for breast cancer screening. Recently, the development of computer-aided diagnosis has improved the reliability of the system, whilst the inception of machine learning, such as deep learning, has further extended its power b...

Emerging sleep health technologies will have an impact on monitoring patients with sleep disorders. This study proposes a new deep learning model architecture that improves the under-blanket sleep posture classification accuracy by leveraging the anatomical landmark feature through an attention strategy. The system used an integrated visible light...

Swallowing disorders, especially dysphagia, might lead to malnutrition and dehydration and could potentially lead to fatal aspiration. Benchmark swallowing assessments, such as videofluoroscopy or endoscopy, are expensive and invasive. Wearable technologies using acoustics and accelerometric sensors could offer opportunities for accessible and home...

Simple Summary: The incidence of endocrine cancers (e.g., thyroid, pancreas, and adrenal) has been increasing; these cancers have a high premature mortality rate. Traditional medical imaging methods (e.g., MRI and CT) might not be sufficient for accurate cancer screening. Elastography complements conventional medical imaging modalities by identifyi...

Sleep posture monitoring is an essential assessment for obstructive sleep apnea (OSA) patients. The objective of this study is to develop a machine learning-based sleep posture recognition system using a dual ultra-wideband radar system. We collected radiofrequency data from two radars positioned over and at the side of the bed for 16 patients perf...

Surface‐enhanced Raman scattering (SERS) imaging has emerged as a promising tool for guided cancer diagnosis and synergistic therapies, such as combined chemotherapy and photothermal therapy (chemo‐PTT). Yet, existing therapeutic agents often suffer from low SERS sensitivity, insufficient photothermal conversion, or/and limited drug loading capacit...

A thorough understanding of the fracture characteristics can assist the decision-making process for surgery. This study aimed to characterize the femoral neck fractures among middle-aged patients and illustrated a biomedical visualization method using a fracture mapping model and augmented reality. We collected plain radiography and computed tomogr...

Agitated behaviour among elderly people with dementia is a challenge in clinical management. Wrist accelerometry could be a versatile tool for making objective, quantitative, and long-term assessments. The objective of this review was to summarise the clinical application of wrist accelerometry to agitation assessments and ways of analysing the dat...

Objectives : We have proposed a novel intramedullary nail (Ni-Nail) by incorporating a sustentaculum tali screw to improve the fixation stability of minimally invasive treatment for calcaneal fractures. This study aimed to evaluate the biomechanical characters of the Ni-Nail system and compare it with traditional C-Nail system. Methods : A finite...

Social distancing measures against COVID-19 imposed restrictions on students that may have affected their physical health and fitness. The objective of this study was to investigate the change in physical fitness of primary school students across the coronavirus outbreaks from 2019 to 2021. This was a retrospective repeated cross-sectional study. W...

Professional esports athletes spend a long time in the same sitting posture during training and competition. Mobile esports may exacerbate potential postural problems because of the closer and unsupported arms and because athletes spend more time in a forward-/flexed-head posture. Prolonged sitting in these postures carries significant health risks...

Virtual reality (VR) technology is one of the promising directions for rehabilitation, especially cognitive rehabilitation. Previous studies demonstrated successful rehabilitation in motor, cognitive, and sensorial functions using VR. The objective of this review is to summarize the current designs and evidence on immersive rehabilitation intervent...

Life skill-based training is essential for intellectual disabled individuals to regain autonomy and social inclusion. Virtual reality (VR) could deliver a nascent application that is more engaging and secure. The objective of this study was to evaluate the training effects of the VR-based multiple life skill training program on life skill performan...

The advancement of 3D printing and scanning technology enables the digitalization and customization of foot orthosis with better accuracy. However, customized insoles require rectification to direct control and/or correct foot deformity, particularly flatfoot. In this exploratory study, we aimed at two design rectification features (arch stiffness...

Surveillance of sleeping posture is essential for bed-ridden patients or individuals at-risk of falling out of bed. Existing sleep posture monitoring and classification systems may not be able to accommodate the covering of a blanket, which represents a barrier to conducting pragmatic studies. The objective of this study was to develop an unobtrusi...

Objectives To develop a deep convolutional neural network (CNN) for the segmentation of femur and tibia on plain x-ray radiographs, hence enabling an automated measurement of joint space width (JSW) to predict the severity and progression of knee osteoarthritis (KOA). Methods A CNN with ResU-Net architecture was developed for knee X-ray imaging se...

Wandering is a common behavioral disorder in the community-dwelling elderly. More than two-thirds of caregivers believe that wandering would cause falls. While physical restraint is a common measure to address wandering, it could trigger challenging behavior in approximately 80% of the elderly with dementia. This study aims to develop a virtual res...

Purpose The population with dementia is increasing sharply to 131.5 million by 2050; total cost worldwide of dementia care will imminently turn on 2 trillion US dollar by 2030, which would be equivalent to the world's 18th largest economy 1,2. Doll therapy reported effective in promoting healing and motivation in patients with dementia 3. However,...

Purpose: Evaluation of the internal biomechanics of the foot-and-ankle complex is challenging for the prescription of orthosis particularly for midfoot arthritis patients in which the joint condition is crucial. Methods: Using computational modeling and design optimization techniques, the objective of this study was to compare the biomechanical...

In the days of covid-19 pandemic, suppression measure, such as social distancing, has played a vital role in containing the virus and reducing the effective reproduction rate. Wearable wristbands have demonstrated successful usage in supporting home-based quarantine in Hong Kong. The elderly residential hostel is one of the high-risk place, which i...

Radiographic Cobb’s angle is the gold standard for evaluation of spinal curvature, however, X-ray is ionising. In contrast, ultrasound is non-ionising and inexpensive. However, no study has reported the reliability and accuracy of ultrasound on sagittal curvature analysis. Ultrasound and X-ray scanning were conducted on 16 sets of spine phantoms wi...

The central nervous system (CNS) has a highly complex biophysical and biochemical environment. Despite decades of intensive research, it is still an enormous challenge to restore its functions and regenerate lost or damaged CNS tissues. Current treatment strategies remain sub-optimal because of (1) the hostile microenvironment created post CNS inju...

Background: Radiographic evaluation for patients with scoliosis using Cobb method is the current gold standard, but radiography has radiation hazards. Several groups have recently demonstrated the feasibility of using 3D ultrasound for the evaluation of scoliosis. Ultrasound imaging is radiation-free, comparatively more accessible, and inexpensive...

A three-dimensional ultrasonic imaging system comprises a vertical stand, a computer, as well as an ultrasound scanner, a space sensor, and a first display connected to the computer respectively. The ultrasound scanner is provided with an ultrasonic probe. The three-dimensional ultrasonic imaging system further comprises a gravity balance board mou...

Background/Objective: Standing radiograph with Cobb's method is routinely used to diagnose scoliosis, a medical condition defined as a lateral spine curvature > 10° with concordant vertebral rotation. However, radiation hazard and two-dimensional (2-D) viewing of 3-D anatomy restrict the application of radiograph in scoliosis examination. Methods:...

The standing radiograph is used as a gold standard to diagnose spinal deformity including scoliosis, a medical condition defined as lateral spine curvature >10°. However, the health concern of X-ray and large inter-observer variation of measurements on X-ray images have significantly restricted its application, particularly for scoliosis screening...

A three-dimensional (3D) ultrasound imaging system (10) for assessing scoliosis, the system (10) comprising: an ultrasound scanner (11) to capture ultrasound images; a spatial sensor (13) to record the position and orientation of the captured ultrasound images; and a software module (21) to mark features of vertebra in the captured ultrasound image...

AIS is defined as deformity of the spine in coronal plane with more than 10 degrees of Cobb’s angle. Cobb’s Method is the gold standard in monitoring patients that are susceptible to scoliosis development. The patients need to conduct an X-ray examination of the patient’s whole spine regularly every 4 to 6 months until skeletal maturity is reached....

This study investigated the feasibility of using three-dimensional (3-D) elastography in measuring cervical lymph node volume and compared the accuracy and reliability of 3-D elastography and 3-D grayscale ultrasound in measurement of ill-defined cervical nodes. Eighteen porcine lymph nodes from the neck were embedded in tissue-mimicking phantoms a...

Cervical lymph nodes are common sites of metastatic involvement in head and neck cancers. These lymph nodes are superficially located and palpation is a common practice for assessing nodal hardness and staging cancer which is, however, too subjective and with limited accuracy. In this study, the mechanical properties of pig lymph node tissues were...

There are great deals of research into fall. It is generally accepted that falls may cause severe injuries, which contributes function decline and disability. Fall is, however, preventable with regularly risk factor assessing and appropriate muscle training. Since prolonged monitor of physical activity (PA) provides evidences to the tendency of hea...

Liver fibrosis is a kind of chronic damage of the liver. The progression of liver fibrosis will result cirrhosis which is one of the top 10 causes of death in the western world. Recently, a device developed based on transient ultrasound elastography, named as Fibroscan, shows promising results with high accuracy and good reproducibility. However, t...

AIS is defined as deformity of the spine in coronal plane with more than 10 degrees of Cobb's angle. Cobb's Method is the gold standard in monitoring patients that are susceptible to scoliosis development. The patients need to conduct an X-ray examination of the patient's whole spine regularly every 4 to 6 months until skeletal maturity is reached....