Institutions
|
About Us
|
Help
|
Gaeilge
0
1000
Home
Browse
Advanced Search
Search History
Marked List
Statistics
A
A
A
Author(s)
Institution
Publication types
Funder
Year
Limited By:
Subject = Biomedical Engineering and Bioengineering;
94 items found
Sort by
Title
Author
Item type
Date
Institution
Peer review status
Language
Order
Ascending
Descending
25
50
100
per page
1
2
3
4
Bibtex
CSV
EndNote
RefWorks
RIS
XML
Displaying Results 1 - 25 of 94 on page 1 of 4
Marked
Mark
A Coupled Fluid-structure Model of a Therapeutic Ultrasound Angioplasty Wire Waveguide
(2007)
Gavin, Graham; Dolan, Finbar; Hashmi, M.S.; McGuinness, Garrett
A Coupled Fluid-structure Model of a Therapeutic Ultrasound Angioplasty Wire Waveguide
(2007)
Gavin, Graham; Dolan, Finbar; Hashmi, M.S.; McGuinness, Garrett
Abstract:
Ultrasonic longitudinal displacements, delivered to the distal tips of small diameter wire waveguides, have been shown to be capable of disrupting complicated atherosclerotic plaques during vascular interventions. These ultrasonic displacements can disrupt plaques by direct contact ablation but also by pressure waves, associated cavitation and acoustic streaming developed in the surrounding blood and tissue cavities. The pressure waves developed within the arterial lumen appear to play a major role but are complex to predict as they are determined by the distal tip output of the wire waveguide (both displacement and frequency), the geometric features of the waveguide tip and the effects of biological fluid interactions. This work describes a numerical linear acoustic fluid-structure model of an ultrasonic wire waveguide and the blood surrounding the distal-tip. The model predicts a standing wave structure in the wire waveguide, including the stresses and the displacements, with the ...
https://arrow.dit.ie/engschmanart/6
Marked
Mark
A full-range, multi-variable, CFD-based methodology to identify abnormal near-wall hemodynamics in a stented coronary artery
(2010)
Murphy, Jonathan; Boyle, Fergal
A full-range, multi-variable, CFD-based methodology to identify abnormal near-wall hemodynamics in a stented coronary artery
(2010)
Murphy, Jonathan; Boyle, Fergal
Abstract:
The benefit of coronary stent implantation is reduced by excessive intimal hyperplasia which re-narrows the artery and the prevention of which is still a primary concern for clinicians. Abnormal hemodynamics create non-physiological viscous stress on the artery wall, one of the root causes of intimal hyperplasia following stent implantation. A methodology to comprehensively evaluate the viscous stress on the artery wall following stent implantation would be useful to evaluate a stent’s hemodynamic performance. The proposed methodology employs 3D computational fluid dynamics, the variables wall shear stress (WSS), WSS gradient (WSSG), WSS angle gradient (WSSAG) and a statistical analysis to evaluate the viscous stress. The methodology is demonstrated and compared to a commonly used “threshold technique” for evaluating a stent’s hemodynamic performance. It is demonstrated that the threshold technique is not adequate to fully analyse the viscous stress on the artery wall and can even b...
https://arrow.dit.ie/engschmecart/18
Marked
Mark
A Linear Finite Element Acoustic Fluid-Structure Model of Ultrasonic Angioplasty in Vivo
(2010)
Wylie, Mark; McGuinness, Garrett; Gavin, Graham
A Linear Finite Element Acoustic Fluid-Structure Model of Ultrasonic Angioplasty in Vivo
(2010)
Wylie, Mark; McGuinness, Garrett; Gavin, Graham
Abstract:
The delivery of high-power ultrasonic energy via small diameter wire waveguides represents a new alternative therapy for the treatment of chronic totally occluded arteries (CTOs). This type of energy manifests itself as a mechanical vibration at the distal-tip of the waveguide with amplitudes of vibration up to 60 µm and at frequencies of 20- 50 kHz. Disruption of diseased tissue is reported to be a result of direct mechanical ablation, cavitation, pressure components and acoustic streaming and that ablation was only evident above the cavitation threshold. This work presents a linear finite element acoustic fluid-structure model of an ultrasonic angioplasty waveguide in vivo. The model was first verified against a reported analytical solution for an oscillating sphere. It was determined that 140 elements per wavelength (EPW) were required to predict the pressure profile generated by the wire waveguide distal-tip. Implementing this EPW count, the pressure field surrounding a range of...
https://arrow.dit.ie/biodevart/2
Marked
Mark
A Mobile ECG Monitoring System with Context Collection
(2008)
Li, Jin Peng
A Mobile ECG Monitoring System with Context Collection
(2008)
Li, Jin Peng
Abstract:
An objective of a health process is one where patients can stay healthy with the support of expert medical advice when they need it, at any location and any time. An associated aim would be the development of a system which places increased emphasis on preventative measures as a first point of contact with the patient. This research is a step along the road towards this type of preventative healthcare for cardiac patients. It seeks to develop a smart mobile ECG monitoring system that requests and records context information about what is happening around the subject when an arrhythmia event occurs. Context information about the subject’s activities of daily living will, it is hoped, provide an enriched data set for clinicians and so improve clinical decision making. As a first step towards a mobile cardiac wellness guidelines system, the focus of this work is to develop a system that can receive bio-signals wirelessly, analyzing and storing the bio-signal in a handheld device and ca...
https://arrow.dit.ie/engmas/32
Marked
Mark
A Mobile ECG Monitoring System with Context Collection
(2009)
Li, Jin Peng; Berry, Damon; Hayes, Richard
A Mobile ECG Monitoring System with Context Collection
(2009)
Li, Jin Peng; Berry, Damon; Hayes, Richard
Abstract:
Preventative health management represents a shift from the traditional approach of reactive treatment-based healthcare towards a proactive wellness-management approach where patients are encouraged to stay healthy with expert support when they need it, at any location and any time. This work represents a step along the road towards proactive, preventative healthcare for cardiac patients. It seeks to develop a smart mobile ECG monitoring system that requests and records context information about what is happening around the subject when an arrhythmia event occurs. Context information about the subject’s activities of daily living will, it is hoped, provide an enriched data set for clinicians and so improve clinical decision making. As a first step towards a mobile cardiac wellness guideline system, the authors present a system which can receive bio-signals that are wirelessly streamed across a body area network from Bluetooth enabled electrocardiographs. The system can store signals ...
https://arrow.dit.ie/teapotcon/24
Marked
Mark
A Monocular Marker-Free Gait Measurement System
(2010)
Courtney, Jane; De Paor, Annraoi M
A Monocular Marker-Free Gait Measurement System
(2010)
Courtney, Jane; De Paor, Annraoi M
Abstract:
This paper presents a new, user-friendly, portable motion capture and gait analysis system for capturing and analyzing human gait, designed as a telemedicine tool to monitor remotely the progress of patients through treatment. The system requires minimal user input and simple single-camera filming (which can be acquired from a basic webcam) making it very accessible to nontechnical, nonclinical personnel. This system can allow gait studies to acquire a much larger data set and allow trained gait analysts to focus their skills on the interpretation phase of gait analysis. The design uses a novel motion capture method derived from spatiotemporal segmentation and model-based tracking. Testing is performed on four monocular, sagittal-view, sample gait videos. Results of modeling, tracking, and analysis stages are presented with standard gait graphs and parameters compared to manually acquired data.
https://arrow.dit.ie/biodevart/7
Marked
Mark
A Multi-Variable Analysis of Transient Near-Wall Haemodynamics in a Stented Coronary Artery
(2010)
Murphy, Jonathan; Boyle, Fergal
A Multi-Variable Analysis of Transient Near-Wall Haemodynamics in a Stented Coronary Artery
(2010)
Murphy, Jonathan; Boyle, Fergal
https://arrow.dit.ie/engschmeccon/26
Marked
Mark
A Numerical Acoustic Fluid-structure Model of a Therapeutic Ultrasound Angioplasty Device
(2006)
Gavin, Graham; Hashmi, M.S. J; Dolan, Finbar; McGuinness, Garrett
A Numerical Acoustic Fluid-structure Model of a Therapeutic Ultrasound Angioplasty Device
(2006)
Gavin, Graham; Hashmi, M.S. J; Dolan, Finbar; McGuinness, Garrett
Abstract:
Ultrasonic angioplasty involves the use of ultrasonic vibrations delivered to the distal-tip of small diameter wire waveguides and is an emerging technology the may have potential use in the treatment of complicated atherosclerotic plaques during cardiovascular surgery. Complicated plaques, including chronic total occlusions and calcified lesions, seriously reduce success rates during standard intervention involving guidewire access, followed by balloon dilation or stent delivery. The large amplitude (0-150 μm) wire waveguide distal-tip displacements in the low-frequency ultrasonic (18-45 kHz) range have been shown to disrupt plaque material by direct contact ablation and cavitation, acoustic streaming and pressure wave components in adjacent fluid 1. The effects on this surrounding fluid are complex and are related to the distal-tip geometry, frequency of operation, vibration amplitude, as well as the operating environment, including, fluid properties and boundary conditions. While...
https://arrow.dit.ie/engschmanconn/3
Marked
Mark
A Numerical Acoustic Fluid-structure Simulation of Therapeutic Ultrasound Angioplasty
(2006)
Gavin, Graham; Dolan, Finbar; Hashmi, M.S J; McGuinness, Garrett
A Numerical Acoustic Fluid-structure Simulation of Therapeutic Ultrasound Angioplasty
(2006)
Gavin, Graham; Dolan, Finbar; Hashmi, M.S J; McGuinness, Garrett
Abstract:
INTRODUCTION Therapeutic ultrasound angioplasty is the delivery of high amplitude ultrasonic displacements to the distal-tip of small diameter wire waveguides with the goal of disrupting atherosclerotic plaques. This is a minimally invasive procedure that may have potential' in the treatment of complicated chronic total occlusions. The disruption of plaque is due to direct contact ablation and also cavitation, pressure waves and acoustic streaming in the fluid surrounding the vibrating waveguide distal-tip [1]. Cavitation appears to play a major role and some authors have suggested that plaque ablation is only evident above the cavitation threshold [2]. Makin and Everbach [3] performed experimental measurements of the acoustic pressures in the field surrounding a vibrating wire waveguide distal-tip (frequency = 22.5 kHz, displacement amplitude = 651lm, tip diameter = 2.46mm). The measured acoustic pressures in the region ahead of the distal-tip are shown in Figure I. No measure...
https://arrow.dit.ie/engschmanconn/5
Marked
Mark
A Vocalisation-based Drawing Interface for Disabled Children
(2004)
Burke, Ted
A Vocalisation-based Drawing Interface for Disabled Children
(2004)
Burke, Ted
Abstract:
In our work with disabled children at Ireland’s National Rehabilitation Hospital, a problem we have experienced in the facilitation of art activities is that traditional art materials and standard computer drawing programs sometimes prove inaccessible. In this paper, an original system, called “PaintMyVoice” is presented which facilitates the creation of two or three-dimensional images using a variety of novel input modalities. In particular, vocalisations can be used to create original images of a variety of objects, including trees, flowers and landscape elements. Additional input to the system can optionally be provided via mouse, keyboard, switch interface or digital camera depending on the abilities of the user. Here, the program’s user interface is described, with an emphasis on accessibility features. The signal processing techniques used to measure various vocal characteristics including intensity, pitch and other spectral characteristics are outlined. The means of translati...
https://arrow.dit.ie/teapotart/5
Marked
Mark
Ablation of Chronic Total Occlusions Using Kilohertz-Frequency Mechanical Vibrations in Minimally Invasive Angioplasty Procedures.
(2010)
McGuinness, Garrett; Wylie, Mark; Gavin, Graham
Ablation of Chronic Total Occlusions Using Kilohertz-Frequency Mechanical Vibrations in Minimally Invasive Angioplasty Procedures.
(2010)
McGuinness, Garrett; Wylie, Mark; Gavin, Graham
Abstract:
Certain minimally invasive cardiology procedures, such as balloon angioplasty and stent implantation, critically require that the site of an arterial blockage be crossed by an intraluminal guidewire. Plaques resulting in near or totally occluded arteries are known as chronic total occlusions (CTOs), and crossing them with conventional guidewires is a significant challenge. Among the most promising proposed solutions is the delivery of high power, low frequency ultrasonic vibrations to the occlusion site via an intraluminal wire waveguide. The vibrating distal-tip of the ultrasound wire waveguide is used to transmit energy to the surrounding plaques, tissues and fluids in order to ablate or weaken atherosclerotic plaque. Potential mechanisms of interaction with the plaque and adjacent fluids identified in the literature include; (i) direct contact with the waveguide distal tip, (ii) subcavitational acoustic fluid pressure fluctuations, (iii) cavitation, and (iv) acoustic streaming. T...
https://arrow.dit.ie/biodevart/11
Marked
Mark
Advanced Scaffold-Based Therapeutics for Peripheral Nerve Repair
(2018)
Lackington, William Arthur
Advanced Scaffold-Based Therapeutics for Peripheral Nerve Repair
(2018)
Lackington, William Arthur
Abstract:
<p>Despite the success of tissue engineered nerve guidance conduits (NGCs) for the treatment of small peripheral nerve injuries, autografts remain the clinical gold standard for larger injuries. Therefore, there is a substantial unmet clinical need for the development of more advanced NGC-based therapies for peripheral nerve repair. In this context, the overall objective of the research presented in this thesis was to develop an advanced NGC-based therapeutic for peripheral nerve repair, initially by engineering a neuroconductive and physicochemically optimized biphasic NGC, which was then functionalized for the controlled delivery of neurotrophic factors in order to accelerate nerve repair. Finally, this biphasic NGC was utilized as an innovative non-viral gene delivery platform in order to elicit a sustained but transient therapeutic response from endogenous cells.</p> <p>In Chapter 2, a biphasic NGC was successfully developed, combining a physicochemically optim...
https://epubs.rcsi.ie/phdtheses/241
Marked
Mark
An Acoustic Fluid-structure Simulation of a Theraputic Ultrasound Wire Waveguide Apparatus
(2005)
Gavin, Graham; Hashmi, M.S.; Dolan, Finbar; McGuinness, Garrett
An Acoustic Fluid-structure Simulation of a Theraputic Ultrasound Wire Waveguide Apparatus
(2005)
Gavin, Graham; Hashmi, M.S.; Dolan, Finbar; McGuinness, Garrett
Abstract:
The use of high-power low-frequency ultrasound transmitted down small diameter wire waveguides is an emerging technology that may have potential in the treatment of complicated atherosclerotic plaques in cardiovascular surgery. This form of energy delivery results in vibrating the distal-tip of the wire waveguide disrupting material by means of direct contact ablation and also cavitation, pressure waves and acoustic streaming in the surrounding fluid. This work describes a numerical acoustic fluid-structure model of the ultrasound wire waveguide and blood surrounding the distal tip. The structural analysis of the model predicts the natural frequencies of the waveguide and shows the extent to which these are affected by the presence of the distal-tip geometry, the surrounding fluid and the length of wire waveguide. These results are validated against experimental results on a 23.5 kHz waveguide apparatus. The acoustic fluid results show the pressure field developed in t...
https://arrow.dit.ie/engschmanconn/23
Marked
Mark
An Experimental Technique for Measurement of Heat Generated During Bone Sawing
(2005)
Parsa, Hamid Khalili; Reilly, Ger; McCormack, Brendan
An Experimental Technique for Measurement of Heat Generated During Bone Sawing
(2005)
Parsa, Hamid Khalili; Reilly, Ger; McCormack, Brendan
Abstract:
Orthopaedic bone cutting processes such as osteotomy and hip arthroplasty involve the cutting of one with the aid of various manual and powered cutting instruments including manual and powered bone saws. The extent of surgically induced bone necrosis at the point of the cutting tool and the bone is mainly due to the frictional heat generated by bone cutting. Bone necrosis has an impact on bone regeneration, and the rate of healing of the bone post operation. The threshold temperature for impaired regeneration of bone is in the range of 44°C to 47°C. Overheating also affects the sharpness life of the blade. A review of the literature indicates that work has been completed on temperature in the immediate cutting zone. This current research focuses on the size of the overheated zone relative to the cutting position and effect of blade sharpness and cutting parameters such as cutting forces and rate of cutting on the size of the affected zone.
https://arrow.dit.ie/engschmanconn/9
Marked
Mark
An Investigation of the Heat Affected Zone in Cortical Bone Sawing
(2005)
Parsa, Hamid Khalili; Reilly, Ger; McCormack, Brendan; Macey, Andrew
An Investigation of the Heat Affected Zone in Cortical Bone Sawing
(2005)
Parsa, Hamid Khalili; Reilly, Ger; McCormack, Brendan; Macey, Andrew
Abstract:
Surgical procedures such as osteotomy and hip replacement involve the cutting of bone with the aid of various manual and powered cutting instruments including manual and powered bone saws. Frictional rubbing between the blade of the saw and the bone results in the generation of localised heating of the cut bone and increased cutting forces (Ark et al, 1997). Overheating in localised areas can cause bone necrosis and have an impact on the rate of healing of the bone post operation and overheating also affects the sharpness life of the blade. A review of the literature indicates that work has been complete on temperature in the immediate cutting zone. This study is focusing on the size of the overheated zone relative to the cutting position.
https://arrow.dit.ie/engschmanconn/8
Marked
Mark
Analysis of Indentation Loading of Cortical Bone Using Acoustic Emission Techniques
(2005)
Safari, Ashkan; Reilly, Ger; McCormack, Brendan
Analysis of Indentation Loading of Cortical Bone Using Acoustic Emission Techniques
(2005)
Safari, Ashkan; Reilly, Ger; McCormack, Brendan
Abstract:
In this study, we recorded the number of Acoustic emission (AE) hits and related AE energy during indentation fracture of cortical bone using a PAC PCI-2 card and pico sensor. A threshold value of 43dB was used to filter premature trigger due to background noise. Registered AE hits had more than one count (threshold crossing). Amplifier gain was set at 40dB with a (0.1-1) MHz band pass filter. 8mm cubes of cortical bones were indented in the longitudinal direction at constant crosshead speed of 1 mm min-1 using a large 2D, 50˚ wedge indenter. We hypothesised that signals occurring as a result of microcracking would have low AE energy and occur prior to and during the period of maximum load whereas those associated with main crack propagation would have high AE energy and occur at fracture only.
https://arrow.dit.ie/engschmanconn/12
Marked
Mark
Antenna Development for Radio Frequency Hyperthermia Applications
(2010)
Curto, Sergio
Antenna Development for Radio Frequency Hyperthermia Applications
(2010)
Curto, Sergio
Abstract:
This thesis deals with the design steps, development and validation of an applicator for radio frequency hyperthermia cancer therapy. An applicator design to enhance targeted energy coupling is a key enabler for preferential temperature increments in tumour regions. A single-element, near-field approach requires a miniaturised solution, that addresses ergonomic needs and is tolerant to patient anatomy. The antenna war-field rriodality and the high-dielectric patient loading introduce significant analytical and computational resource challenges. The antenna input impedance has to be sufficiently insensitive to in-band resonant cletuning and the fields in the tissue can he targeted to selected areas in the patient. An introduction to the medical and biological background of hyperthermia is presented. The design requirements of antennas for medical and in particular for hyperthermia applications are highlighted. Starting from a conventional circular patch, the antenna evolved into a co...
https://arrow.dit.ie/engdoc/38
Marked
Mark
Application of Advanced Computational Modelling in the Comparison of Stent Induced Coronary Flow Disturbances
(2007)
Murphy, Jonathan; Boyle, Fergal
Application of Advanced Computational Modelling in the Comparison of Stent Induced Coronary Flow Disturbances
(2007)
Murphy, Jonathan; Boyle, Fergal
Abstract:
Coronary stent implantation can improve blood flow in an artery narrowed by the build up of arterial plaque. However, the haemodynamic effect of stent placement is unclear and may influence arterial restenosis (re-blockage). In this investigation computational fluid dynamics (CFD) was used to predict the non-Newtonian three-dimensional flow field in a coronary artery following implantation of two different stents. A graphical illustration of the stented areas affected to various degrees of wall shear stress (WSS) is presented for both the Palmaz-Schatz (PS) and the Gianturco-Roubin-II (GR-II) coronary stents. The axial WSS and wall shear stress gradient (WSSG) is also presented graphically over one stent strut for each stent. Finally, a comparison is drawn between the CFD results and restenosis data from a clinical trial.
https://arrow.dit.ie/engschmeccon/21
Marked
Mark
Application of Advanced Computational Modelling in the Numerical Prediction of the Haemodynamic Impact of Coronary Stent Implantation
(2006)
Murphy, Jonathan; Boyle, Fergal
Application of Advanced Computational Modelling in the Numerical Prediction of the Haemodynamic Impact of Coronary Stent Implantation
(2006)
Murphy, Jonathan; Boyle, Fergal
Abstract:
Coronary stent implantation can improve blood flow in an artery narrowed by the build up of arterial plaque. However, the haemodynamic effect of stent placement is unclear and may influence arterial restenosis (re-blockage). In this investigation the stent induced, non-Newtonian blood flow disturbances have been captured in a three dimensional computational domain. The results clearly show areas of low wall shear stress proximal and distal to the stent wires, a characteristic which is known to encourage restenosis. Furthermore, this computational method of observing the complex haemodynamics of the stent environment can be used in conjunction with medical trial data to find links between stent design and restenosis patterns.
https://arrow.dit.ie/engschmeccon/25
Marked
Mark
Application of Digital Image Processing to Marker-free Analysis of Human Gait
(2001)
Courtney, Jane; Burke, David; dePaor, Annraoi
Application of Digital Image Processing to Marker-free Analysis of Human Gait
(2001)
Courtney, Jane; Burke, David; dePaor, Annraoi
Abstract:
The standard method of human gait analysis in use in gait laboratories today invariably involves marker-based motion tracking systems. Although somewhat effective, these methods require accurate placement of awkward external markers. We report on an enhanced approach being researched and developed at the National Rehabilitation Hospital, Dublin based on marker-free motion tracking incorporating advanced digital image processing techniques.
https://arrow.dit.ie/biodevart/13
Marked
Mark
Assessment of the Effects of Increasing Levels of Physiological Realism in the Computational Fluid Dynamics Analyses of Implanted Coronary Stents
(2008)
Murphy, Jonathan; Boyle, Fergal
Assessment of the Effects of Increasing Levels of Physiological Realism in the Computational Fluid Dynamics Analyses of Implanted Coronary Stents
(2008)
Murphy, Jonathan; Boyle, Fergal
Abstract:
Coronary stent implantation can improve blood flow in an artery that has been narrowed by the build up of arterial plaque. However, the implantation of the stent will change the geometry of the vessel wall. The haemodynamic effects of the stents presence and alteration of the vessel wall are unclear. The redistribution of flow induced vessel wall shear stress (WSS) and wall shear stress gradient (WSSG) may directly contribute to restenosis (re-blockage). Computational fluid dynamics (CFD) is used extensively to identify these parameters in stented vessels. However, simplifications to the model of the stented artery are common. In this paper, computational domains of stented arteries with increasing levels of physiological realism are created. CFD is used to predict the WSS and WSSG for each set of computational domains. Finally, the results show that certain simplifications are not valid for CFD analyses of implanted coronary stents.
https://arrow.dit.ie/engschmeccon/19
Marked
Mark
Augmented control of hands free voice prostheses
(2008)
Madden, Brian; Condron, James; Burke, Ted; Coyle, Eugene
Augmented control of hands free voice prostheses
(2008)
Madden, Brian; Condron, James; Burke, Ted; Coyle, Eugene
Abstract:
Laryngectomy patients often use an electrolarynx to facilitate speech following a tracheotomy. Devices of this type provide the most intelligible means of communication for tracheotomy patients. However, the electro-larynx has inherent drawbacks such as the buzzing monotonic sound emitted, the need for a free hand to operate the device, and the difficulty experienced by many tracheotomy patients in adapting to use it. The most effective means of addressing the shortcomings of existing electro-larynges is to provide the user with a hands-free facility. This allows the user to perform other manual tasks whilst speaking, or simply to communicate more effectively through body language. Hands-free devices do exist but require a considerable amount of patient training as they involve the use of the shoulder muscles to control pitch. Furthermore, they are not suitable for all patients as the hands-free is suitable only for users with a certain type of tracheotomy. Goldstein et al in 2004 [...
https://arrow.dit.ie/teapotcon/1
Marked
Mark
Blood Vessel Diameter Estimation System Using Active Contours
(2011)
Courtney, Jane; Tizon, Ana
Blood Vessel Diameter Estimation System Using Active Contours
(2011)
Courtney, Jane; Tizon, Ana
Abstract:
The study and analysis of blood vessel geometry has become the basis of medical applications related to early diagnosis and effective monitoring of therapies in vascular diseases. This paper presents a new method to trace the outline of blood vessels from imperfect images and extract useful information about their dimensions in an automated manner. The system consists of a segmentation procedure that uses two Active Contours to detect blood vessel boundaries and a novel approach to measure blood vessel diameters directly as the distance between two points. We have succeeded in designing and implementing an automated, robust, measurement method that is not only accurate (it takes away human error) but also user-friendly and requires very little image pre-processing. The system is tested with a set of grey scale images of blood vessels. Results of all the aspects of the design and implementation are presented along with graphs and images.
https://arrow.dit.ie/biodevcon/12
Marked
Mark
Breast Cancer Detection Using Interferometric MUSIC: Experimental and Numerical Assessment
(2014)
Ruvio, Giuseppe; Solimene, Raffaele; Cuccaro, Antonio; Gaetano, Domenico; Browne, Jacin...
Breast Cancer Detection Using Interferometric MUSIC: Experimental and Numerical Assessment
(2014)
Ruvio, Giuseppe; Solimene, Raffaele; Cuccaro, Antonio; Gaetano, Domenico; Browne, Jacinta; Ammann, Max
Abstract:
Purpose: In microwave breast cancer detection, it is often beneficial to arrange sensors in close proximity to the breast. The resultant coupling generally changes the antenna response. As an a priori characterization of the radio frequency system becomes difficult, this can lead to severe degradation of the detection efficacy. The purpose of this paper is to demonstrate the advantages of adopting an interferometric multiple signal classification (I-MUSIC) approach due to its limited dependence from a priori information on the antenna. The performance of I-MUSIC detection was measured in terms of signal-to-clutter ratio (SCR), signal-to-mean ratio (SMR), and spatial displacement (SD) and compared to other common linear noncoherent imaging methods, such as migration and the standard wideband MUSIC (WB-MUSIC) which also works when the antenna is not accounted for. Methods: The data were acquired by scanning a synthetic oil-in-gelatin phantom that mimics the dielectric properties of br...
https://arrow.dit.ie/ahfrcart/55
Marked
Mark
Characterising 3D Soft Tissue Features on Joint Surfaces
(2011)
O'Kane, Colm
Characterising 3D Soft Tissue Features on Joint Surfaces
(2011)
O'Kane, Colm
Abstract:
A crucial aspect of orthopaedic implant design is the prediction of surgical outcomes when the shape of a bone is necessarily altered by the addition of the implant. Matching native kinematics as closely as possible is generally considered a core aim of joint replacement surgery. The overall hypothesis behind this research is that soft tissue geometry, including cartilage thickness distribution and ligament attachment sites, influences kinematics in the knee joint. In order to enable investigation of possible links between geometry and kinematics, the ability to characterise the shape variation of the soft tissue relative to the underlying bony geometry must first be developed. This is the aspect which has been addressed in this work.
https://arrow.dit.ie/biodevcon/2
Displaying Results 1 - 25 of 94 on page 1 of 4
1
2
3
4
Bibtex
CSV
EndNote
RefWorks
RIS
XML
Institution
Dublin Institute of Technology (89)
Royal College of Surgeons i... (5)
Item Type
Conference item (35)
Doctoral thesis (3)
Journal article (15)
Review (1)
Other (40)
Peer Review Status
Peer-reviewed (3)
Non-peer-reviewed (2)
Unknown (89)
Year
2018 (3)
2017 (4)
2016 (1)
2015 (4)
2014 (3)
2013 (4)
2012 (6)
2011 (9)
2010 (13)
2009 (5)
2008 (8)
2007 (8)
2006 (8)
2005 (9)
2004 (8)
2001 (1)
built by Enovation Solutions