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Advances in Medical, Signal and Information Processing, 2008. MEDSIP 2008. 4th IET International Conference on

Date 14-16 July 2008

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Displaying Results 1 - 25 of 58
  • About the speaker

    Publication Year: 2008 , Page(s): 1
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  • About the speaker

    Publication Year: 2008 , Page(s): 1
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    Safety Policy and Management for Global Sites ▪ Why is this necessary? ▪ How should we proceed? ▪ What is the value to the business or organisation? View full abstract»

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  • Safety policy and management for global sites

    Publication Year: 2008 , Page(s): 1 - 30
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  • Delivering engineering safely at Sellafield

    Publication Year: 2008 , Page(s): 1 - 16
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  • About the speaker

    Publication Year: 2008 , Page(s): 1
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  • Designing for safety

    Publication Year: 2008 , Page(s): 1 - 15
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    ≫ Reduction in number of mechanical direct drives ≫ Elimination of onboard generation ≫ Reduction in noise levels ≫ Low maintenance ≫ Increase in potential for remote operation and monitoring of plant View full abstract»

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  • About the speaker

    Publication Year: 2008 , Page(s): 1
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (217 KB)  

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  • Safety management on electrical systems An approach to safe operating & maintenance practices

    Publication Year: 2008 , Page(s): 1 - 23
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  • Auditing electrical systems

    Publication Year: 2008 , Page(s): 1 - 3
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  • Auditing electrical assets across the life cycle

    Publication Year: 2008 , Page(s): 1 - 30
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  • About the speaker

    Publication Year: 2008 , Page(s): 1
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    The aim of this talk is to analyze whether the use of the cortical activity estimated from non-invasive EEG recordings could be useful to detect mental states related to the imagination of limb movements. Estimation of cortical activity was performed on high resolution EEG data related to the imagination of limb movements gathered in five normal healthy subjects by using realistic head models. Cortical activity was estimated in Region of Interest associated with the subject’s Brodmann areas by using depth-weighted minimum norm solutions. Comparisons between surface recorded EEG and the estimated cortical activity were performed. The estimated cortical activity related to the mental imagery of limbs in the five subjects is located mainly over the contralateral primary motor area. The imbalance between brain activity estimated in contralateral and ipsilateral motor cortical areas relative to the finger movement imagination is greater than those obtained in the scalp EEG recordings. Results suggest that the use of the estimated cortical activity for the motor imagery of upper limbs could be potentially superior with respect to the use of surface EEG recordings. View full abstract»

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  • Low frequency phase synchronisation analysis of MEG recordings from children with ADHD and controls using single channel ICA

    Publication Year: 2008 , Page(s): 1 - 4
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    It has been suggested that the human brain is intrinsically organised into dynamic, anti-correlated functional networks. This paper presents a study on the so-called default mode network - which is active when the brain is apparently at rest - and on brain activity related to a given task. This work involves the analysis of low frequency magnetoencephalographic recordings of children with Attention Deficit Hyperactivity Disorder (ADHD) and controls performing both attentional as well as perceptual tasks. Single channel independent component analysis is used to isolate low frequency brain signals within the data in the presence of higher frequency brain activity and artifacts. Phase synchrony analysis is then carried out between the components of channels of interest to quantify any interaction between distant brain regions within the default-mode network. Preliminary results show variations in the phase locking between ADHD and controls, and indicate a corresponding change in phase synchrony between the corresponding brain regions at periods of rest and when tasks are being performed. View full abstract»

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  • Late positive event-related potentials enhancement through independent component analysis clustering

    Publication Year: 2008 , Page(s): 1 - 4
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    This paper presents a method to evaluate residual dependencies between sources estimated by ICA to be used in a hierarchical clustering procedure. As a proximity measure a mutual information-based metric is employed. The properties of each group of components are evaluated at each level of the hierarchical tree by two indices that aim at assessing both cluster tightness and physiological reliability through a template matching process. These two indices are used in three different approaches to find the most suitable combination to explore the hierarchical structure of the clustering. This method is aimed at enhancing late positive event-related brain potentials elicited by emotional picture stimuli. Such critical brain events are produced by presenting a subject with emotionally arousing images with respect to neutral ones. Exploiting the modularity of the spatial distribution of late EEG components, ICA can be employed to separate out their contribution, that is then investigated in an automatic ad objective manner by the clustering procedure. View full abstract»

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  • A fast algorithm for automated independent process separation from single channel biomedical signal recordings: FastIPA

    Publication Year: 2008 , Page(s): 1 - 4
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    Independent component analysis (ICA) has found many uses in source separation in biomedical signals. We highlight a methodology and put forward an algorithm which allows single channel ICA to be performed on single channel biomedical signal recordings. The algorithm uses a fast, deflationary approach to efficiently extract independent processes underlying the single channel recordings. We show that for processes which are reasonably spectrally disjoint the algorithm can separate out individual sources. We show examples of this using brain signal recordings and abdominal foetal recordings. View full abstract»

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  • Blind source separation to extract foetal heart sounds from noisy abdominal phonograms: A single channel method

    Publication Year: 2008 , Page(s): 1 - 4
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    A method for extracting foetal heart sounds (FHS) from noisy single channel abdominal phonograms is proposed. First, an appropriate matrix of delays is constructed; then multiple independent components are calculated using FastICA; finally, components are projected back onto the measurement space and those associated to FHS are subjectively selected. Three single channel phonograms, obtained from different subjects were analysed. Preliminary results are promising and showed successfully extractions of FHS (S1, S2). Future work will increase the number of subjects, evaluate the extraction quality, look for more information about foetal well-being, find an objective way to select FHS, and explore ICA implementations that utilise temporal structure such as Temporal Decorrelation source SEParation (TDSEP). View full abstract»

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  • Exploiting independence measures in dual spaces with application to atrial f-wave extraction in the ECG

    Publication Year: 2008 , Page(s): 1 - 4
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    Atrial flutter is a life-threatening cardiac arrhythmia with an increasing prevalence during the last decennia. To characterise and diagnose atrial fibrillation based on the electrocardiographic waveforms, we propose an algorithm that extracts the f-wave from the observations. This algorithm is based on classical independent component analysis algorithms, but is applied in a transform domain of the original signal to assure that the source extraction contrast is discriminative for the source of interest. Results show that it is of high importance to choose the right domain before processing the signal. View full abstract»

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  • A geographic network for MRI assessment of iron overload in thalassemia: The MIOT experience

    Publication Year: 2008 , Page(s): 1 - 4
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    Today there are about 6000 thalassemia patients in Italy, with a marked prevalence in the south, Sardinia and Sicily. Cardiac magnetic resonance (CMR) measurement of myocardial iron overload allows early diagnosis and treatment of these patients. To optimize patient care, CMR centers should be easily accessible for the patients and should be able to perform iron overload measurement in a standardized way. To accomplish this objective, an analysis system was developed and distributed to six CMR centers. Fifty haematological and paediatric centers specialized in thalassemia care were also involved. All centers are linked by a web-based network, configured to collect and share patient data, assuring personal data protection. The inter-center variability of the proposed methodology was evaluated, demonstrating the effectiveness of the network. View full abstract»

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  • A soft sensing method for monitoring ambulatory activities of patients with venous ulceration

    Publication Year: 2008 , Page(s): 1 - 4
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    This paper sets out to investigate the characteristics of two relatively new sensors, the Flexpoint bend sensor reg and the ionic polymeric metal composite (IPMC), for use outside of the clinical setting to monitor the activity of patients who have venous ulceration. Results from testing these sensors show that they achieve consistent results in tests over a range of frequencies, and therefore that it is possible to use them as motion detectors in human movement. View full abstract»

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  • A ubiquitous smart home for elderly

    Publication Year: 2008 , Page(s): 1 - 4
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    One major challenge to successful aging is the capability to preserve health, or from another perspective to avoid disease. Unfortunately, a large percentage of the elderly people are living with chronic diseases or disabilities. Home care technologies and other emerging technologies have the potential to play a major role in home-based health care approach. The main goal of the presented research in this paper is to develop a cost-effective user-friendly telemedicine system to serve the elderly and disabled people in the community, and to establish a continuous communication link between patients and caregivers and allow physicians to offer help when needed. Hence, we are presenting here an integrated user-friendly model of a smart home which provides telemedicine for elderly at home. The paper focuses on implementation details and practical considerations of integrating the diverse technologies into a working system. View full abstract»

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  • Time-series data analysis of blood sugar and HbA1c levels of diabetic

    Publication Year: 2008 , Page(s): 1 - 4
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    Time-series data analyses of blood sugar and HbA1c levels of a diabetic were presented. These analyses were based on the simple idea that accumulation of the effects of a person's lifestyle could influence daily health with some delay, which may reflect complex bio-reactions in the human body. In these analyses, correlations of time-series data are checked focusing on the accumulation of effects of daily lifestyle, and on variation of daily health data. A retardation parameter is introduced. Rule-mining using the C5.0 algorithm following the time-series data analyses produced useful relationships among lifestyles, blood sugar level, and HbAlc level of a diabetic. View full abstract»

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  • A cell phone-based diary for chronic diseases

    Publication Year: 2008 , Page(s): 1 - 4
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    Paper medical diaries have effectively been used in chronic diseases. To facilitate self-control of chronic diseases and observe a patient's condition continuously, we developed a cell phone-based personal medical recorder for patients suffering chronic disease. The application was designed to be like a scheduler and implemented as an "i-Appli" (Java2ME application, NTT DoCoMo, Inc., Japan). The patient selects answers from lists and types in numeric data and comments. The application stores laboratory data, such as BP, BUN, creatinine, etc., and other pertinent clinical events, such as headache occurrence, severity, disability, menstruation and medications on each day. The application can customize, add or delete items. Various graphic displays of the data are automatically shown. The data can also be sent to a PC with infrared communications. In a usage trial for chronic hemodialysis or chronic headache, patients were favorably receptive about this application and indicated they wanted to continue using it. View full abstract»

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  • Application of quartz tuning forks in multiple-breath-helium washout measurement

    Publication Year: 2008 , Page(s): 1 - 4
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    Multiple-breath-washout (MBW) measurements are regarded as a sensitive technique for lung function studies which can reflect the ventilation inhomogeneity of our respiratory airways [7,8,9]. Typically nitrogen is used as the tracer gas and is washed out by pure oxygen in multi-breath-nitrogen (MBNW) washout tests. In this work, instead of using nitrogen, 4He is used as the tracer gas. A commercial quartz tuning fork with a resonance frequency of f-32 kHz has been used for detecting the concentration of 4He gas at room temperature. This low-cost sensor has been used previously for detecting the gas density [11]. The resonance frequency of the tuning fork decreases linearly with increasing density of the surrounding gas and we use this effect to determine the helium concentration. The resulting washout curve from an asthmatic volunteer has smaller curve linearity compared to a normal healthy person which reflects the higher ventilation inhomogeneity of the respiratory airways. View full abstract»

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  • Optimizing the assessment of autoregulation from black-box models

    Publication Year: 2008 , Page(s): 1 - 4
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    Autoregulation mechanisms maintain blood flow approximately stable when blood pressure changes. Impairment in autoregulatory function can be identified by black-box modelling with blood pressure as input, and blood flow as output, using only spontaneous variability in both signals. The current paper addresses the issue of how to assess autoregulaton from the model parameters. We propose using a test input in the shape of a band-pass filtered impulse, that reflects the characteristics of blood pressure variations more accurately than the more commonly used step response. Features extracted from the relationship between the new impulse and the best-fit model response are shown to have better dynamic range and stability than a comparable index derived from the step response. View full abstract»

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  • Simulating and predicting blood glucose levels for improved diabetes healthcare

    Publication Year: 2008 , Page(s): 1 - 4
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    Expert management of blood glucose levels (BGLs) can be difficult to achieve for many people with diabetes, since BGLs are affected in a very complex and non-linear manner by carbohydrate intake (diet), medication (tablets or insulin) and exercise. This paper discusses some of the expert management diabetes software systems that have been developed in the last decade which can accommodate the day- to-day complexities of BGL control, through a BGL prediction / therapy optimization strategy. In particular, the popular AIDA educational diabetes simulator is reviewed, together with a novel BGL simulation system based on artificial neural networks. View full abstract»

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  • Spike detection algorithm improvement, spike waveforms projections with PCA and herarchical classification

    Publication Year: 2008 , Page(s): 1 - 4
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    Definition of single spikes from multiunit spike trains plays a critical role in neurophysiology and in neuroengineering. Moreover, long period analysis are needed to study synaptic plasticity effects and observe the long and medium term development on which all central nervous system (CNS) learning functions are based. Therefore, the increasing importance of long period recordings makes necessary on-line and real time analysis, memory use optimization and data transmission rate improvement. A threshold-amplitude spikes detection method is chosen and 5 noise level estimate methods were developed. Than APs are bundled to group using principal component analysis and classified (hierarchical classifier). The system has lot of applications like high-throughput pharmacological screening and monitoring effects. View full abstract»

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