Browsing by Author "Istepanian, R S"
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- ItemDesign of a telemedicine system using a mobile telephone.(2001-04-12) Woodward, B; Istepanian, R S; Richards, C IThis paper describes the design of a prototype integrated mobile telemedicine system that is compatible with existing mobile telecommunications networks and upgradable for use with third generation networks The system when fully developed will enable a doctor to monitor remotely a patient who is free to move around for sports medicine and for emergency situations
- ItemECG data compression using wavelets and higher order statistics methods.(2001-06-25) Istepanian, R S; Hadjileontiadis, L J; Panas, S MThis paper evaluates the compression performance and characteristics of two wavelet coding compression schemes of electrocardiogram ECG signals suitable for real time telemedical applications The two proposed methods namely the optimal zonal wavelet coding OZWC method and the wavelet transform higher order statistics based coding WHOSC method are used to assess the ECG compression issues The WHOSC method employs higher order statistics HOS and uses multirate processing with the autoregressive HOS model technique to provide increasing robustness to the coding scheme The OZWC algorithm used is based on the optimal wavelet based zonal coding method developed for the class of discrete Lipschitizian signals Both methodologies were evaluated using the normalized rms error NRMSE and the average compression ratio CR and bits per sample criteria applied on abnormal clinical ECG data samples selected from the MIT BIH database and the Creighton University Cardiac Center database Simulation results illustrate that both methods can contribute to and enhance the medical data compression performance suitable for a hybrid mobile telemedical system that integrates these algorithmic approaches for real time ECG data transmission scenarios with high CRs and low NRMSE ratios especially in low bandwidth mobile systems
- ItemEffect of wavelet compression on data transmission in a multipurpose wireless telemedicine system.(2001-09-28) Istepanian, R S; Kyriacou, E; Pavlopoulos, S; Koutsouris, DWe have developed a novel emergency telemedicine system which allows the transmission of physiological data electrocardiogram oximetry blood pressure and temperature and still images of the patient The transmission is performed through wireless links using either GSM mobile phones or satellite Because of the low bandwidth available through these links data compression is required to allow realtime transmission of electrocardiographic ECG data A new integrated design approach for an optimal zonal wavelet compression OZWC method was implemented for the ECG data The performance of the mobile system with compressed ECG data segments was evaluated in terms of the percentage root mean square difference and visual inspection The optimum wavelet algorithm achieved a maximum compression ratio of 18 1 with low distortion
- ItemOptimal zonal wavelet-based ECG data compression for a mobile telecardiology system.(2000-11-07) Istepanian, R S; Petrosian, A AA new integrated design approach for an optimal zonal wavelet based ECG data compression OZWC method for a mobile telecardiology model is presented The hybrid implementation issues of this wavelet method with a GSM based mobile telecardiology system are also introduced The performance of the mobile system with compressed ECG data segments selected from the MIT BIH arrhythmia data base is evaluated in terms of bit error rate BER percent rms difference PRD and visual clinical inspection The compression performance analysis of the OZWC is compared with another wavelet based Discrete Symmetric Wavelet Compression approach The optimal wavelet algorithm achieved a maximum compression ratio of 18 1 with low PRD ratios The mobile telemedical simulation results show the successful compressed ECG transmission at speeds of 100 km h with BER rates of less than 10 15 providing a 73 reduction in total mobile transmission time with clinically acceptable reconstruction of the received signals This approach will provide a framework for the design and functionality issues of GSM based wireless telemedicine systems with wavelet compression techniques and their future integration for the next generation of mobile telecardiology systems
- ItemTelemedicine in Armenia.(2000-11-17) Istepanian, R S; Nikogosian, HTelemedicine in Armenia began with the US Telemedicine Space Bridge programme which was introduced following the disastrous earthquake in 1988 More recently educational programmes have been established between the School of Medicine at Boston University and the Emergency Hospital in Yerevan There are also telemedicine activities involving the Internet for example at the Diagnostica Medical Centre in Yerevan The future integration of telemedicine and telehealth services within the health services in Armenia will produce significant benefits Current telemedicine activities in Armenia represent models for collaborative projects in other former Soviet republics with the aim of providing greater access to health care at higher quality and lower cost
- ItemTelemedicine in the United Kingdom: current status and future prospects.(2000-03-31) Istepanian, R SThe objective of this correspondence is to present an overview of some of the current development and some of the ongoing telemedicine programs in the United Kingdom The issues of the future integration of telemedicine activities within the National Health Service that promises better access to healthcare with higher efficiency mobility and lower cost are also discussed
- ItemUNWIRED E-MED: the next generation of wireless and internet telemedicine systems.(2000-11-07) Laxminarayan, S; Istepanian, R SThe movement of telemedicine to wireless and mobile Internet applications is imminent in the next few years This migration from desktop platforms to wireless and mobile configurations will have a significant impact on future healthcare delivery systems and their globalization Recent telecommunications and biomedical computing advances will significantly enhance the current methodologies of telemedicine and telecare systems This editorial will present some of the evolutionary issues and important aspects that have to be considered in developing technologies for the next generation of Internet and third generation of mobile systems geared for future telemedical applications These will provide new dimensions to existing medical services and areas of outreach that are not possible with the current generation that will have tremendous impact on how healthcare delivery will be shaped for the 21st century