129 research outputs found
Analyzing fibrous tissue pattern in fibrous dysplasia bone images using deep R-CNN networks for segmentation
Predictive health monitoring systems help to detect human health threats in the early stage. Evolving deep learning techniques in medical image analysis results in efficient feedback in quick time. Fibrous dysplasia (FD) is a genetic disorder, triggered by the mutation in Guanine Nucleotide binding protein with alpha stimulatory activities in the human bone genesis. It slowly occupies the bone marrow and converts the bone cell into fibrous tissues. It weakens the bone structure and leads to permanent disability. This paper proposes the study of FD bone image analyzing techniques with deep networks. Also, the linear regression model is annotated for predicting the bone abnormality levels with observed coefficients. Modern image processing begins with various image filters. It describes the edges, shades, texture values of the receptive field. Different types of segmentation and edge detection mechanisms are applied to locate the tumor, lesion, and fibrous tissues in the bone image. Extract the fibrous region in the bone image using the region-based convolutional neural network algorithm. The segmented results are compared with their accuracy metrics. The segmentation loss is reduced by each iteration. The overall loss is 0.24% and the accuracy is 99%, segmenting the masked region produces 98% of accuracy, and building the bounding boxes is 99% of accuracy
Pinning down loosened prostheses : imaging and planning of percutaneous hip refixation
This thesis examines how computer software can be used to analyse medical images of an aseptically loosening hip prosthesis, and subsequently to plan and guide a minimally invasive cement injection procedure to stabilize the prosthesis. We addressed the detection and measurement of periprosthetic bone lesions from CT image volumes. Post-operative CTs of patients treated at our institution were analysed. We developed tissue classification algorithms that automatically label periprosthetic bone, cement and fibrous interface tissue. An existing particle-based multi-material meshing algorithm was adapted for improved Finite Element model creation. We then presented HipRFX, a proof-of-concept software tool for planning and guidance during percutaneous cement refixation procedures.Advanced School for Computing and Imaging (ASCI), Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO), Stichting Anna Fonds, Technologiestichting STWUBL - phd migration 201
Automatic segmentation of the human thigh muscles in magnetic resonance imaging
Advances in magnetic resonance imaging (MRI) and analysis techniques have improved
diagnosis and patient treatment pathways. Typically, image analysis requires substantial
technical and medical expertise and MR images can su↵er from artefacts, echo and
intensity inhomogeneity due to gradient pulse eddy currents and inherent e↵ects of pulse
radiation on MRI radio frequency (RF) coils that complicates the analysis. Processing
and analysing serial sections of MRI scans to measure tissue volume is an additional
challenge as the shapes and the borders between neighbouring tissues change significantly
by anatomical location. Medical imaging solutions are needed to avoid laborious manual
segmentation of specified regions of interest (ROI) and operator errors.
The work set out in this thesis has addressed this challenge with a specific focus on
skeletal muscle segmentation of the thigh. The aim was to develop an MRI segmentation
framework for the quadriceps muscles, femur and bone marrow. Four contributions of
this research include: (1) the development of a semi-automatic segmentation framework
for a single transverse-plane image; (2) automatic segmentation of a single transverseplane
image; (3) the automatic segmentation of multiple contiguous transverse-plane
images from a full MRI thigh scan; and (4) the use of deep learning for MRI thigh
quadriceps segmentation.
Novel image processing, statistical analysis and machine learning algorithms were developed
for all solutions and they were compared against current gold-standard manual
segmentation. Frameworks (1) and (3) require minimal input from the user to delineate
the muscle border. Overall, the frameworks in (1), (2) and (3) o↵er very good
output performance, with respective framework’s mean segmentation accuracy by JSI
and processing time of: (1) 0.95 and 17 sec; (2) 0.85 and 22 sec; and (3) 0.93 and 3 sec.
For the framework in (4), the ImageNet trained model was customized by replacing the
fully-connected layers in its architecture to convolutional layers (hence the name of Fully
Convolutional Network (FCN)) and the pre-trained model was transferred for the ROI
segmentation task. With the implementation of post-processing for image filtering and
morphology to the segmented ROI, we have successfully accomplished a new benchmark
for thigh MRI analysis. The mean accuracy and processing time with this framework
are 0.9502 (by JSI ) and 0.117 sec per image, respectively
Injury and Skeletal Biomechanics
This book covers many aspects of Injury and Skeletal Biomechanics. As the title represents, the aspects of force, motion, kinetics, kinematics, deformation, stress and strain are examined in a range of topics such as human muscles and skeleton, gait, injury and risk assessment under given situations. Topics range from image processing to articular cartilage biomechanical behavior, gait behavior under different scenarios, and training, to musculoskeletal and injury biomechanics modeling and risk assessment to motion preservation. This book, together with "Human Musculoskeletal Biomechanics", is available for free download to students and instructors who may find it suitable to develop new graduate level courses and undergraduate teaching in biomechanics
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Advanced Magnetic Resonance Imaging of Osteoarthritis
This thesis examines the potential utility of magnetic resonance (MR) quantitative imaging biomarkers (QIBs) of knee osteoarthritis (OA) for rapid assessment of treatment efficacy in experimental medicine studies.
The development of treatments able to modify disease in OA is hampered by an inability to evaluate treatment response over a timeframe relevant to clinical trials. There are particular challenges in the experimental medicine setting due to the small numbers of participants and short follow-up duration relative to the expected time course of OA development and progression. Multiple MR QIBs of OA exist which may help address the problem of early evaluation of treatment response. However, their use in early phase studies has remained limited. Possible reasons for this include incomplete characterisation of the performance of QIBs in this setting and lack of head-to-head comparison of candidate QIBs to determine which would be optimal.
This thesis aims to address these shortcomings and provide new information on the likely utility of MR QIBs in the setting of experimental medicine studies, as well as their potential for improving our general understanding of OA pathophysiology.
I start by examining the reliability and ability to discriminate between OA and healthy knees of cartilage compositional MR imaging in a systematic review and meta-analysis. I then describe the development and validation of a novel semi-automatic surface-based method for analysing articular cartilage composition and morphology at the knee which may offer improved responsiveness and spatial localisation of change. Moving to QIBs of subchondral bone, I evaluate the association between measures of subchondral bone architecture derived from MR texture analysis and OA progression in the Osteoarthritis Initiative. The remainder of the thesis describes a prospective observational study where the utility of MR QIBs of synovium, subchondral bone and cartilage in experimental medicine studies is assessed.
In summary, this thesis will inform decisions regarding the use of MR-based QIBs in future longitudinal and interventional studies. Their inclusion in experimental medicine studies may allow early assessment of treatment efficacy at a structural level and improve efficiency of treatment development pipelines.Funding: Addenbrooke's Charitable Trust, Experimental Medicine Initiative, non-investigator sponsored study grant from GlaxoSmithKlin
UWOMJ Volume 67, Number 2, Summer 1998
Schulich School of Medicine & Dentistryhttps://ir.lib.uwo.ca/uwomj/1244/thumbnail.jp
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