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Multiresolution wavelet analysis for efficient analysis, compression and remote display of long-term physiological signals

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Abstract

Increased inter-equipment connectivity coupled with advances in Web technology allows ever escalating amounts of physiological data to be produced, far too much to be displayed adequately on a single computer screen. The consequence is that large quantities of insignificant data will be transmitted and reviewed. This carries an increased risk of overlooking vitally important transients. This paper describes a technique to provide an integrated solution based on a single algorithm for the efficient analysis, compression and remote display of long-term physiological signals with infrequent short duration, yet vital events, to effect a reduction in data transmission and display cluttering and to facilitate reliable data interpretation. The algorithm analyses data at the server end and flags significant events. It produces a compressed version of the signal at a lower resolution that can be satisfactorily viewed in a single screen width. This reduced set of data is initially transmitted together with a set of ‘flags’ indicatingwhere significant events occur. Subsequent transmissions need only involve transmission of flagged data segments of interest at the required resolution. Efficient processing and code protection with decomposition alone is novel. The fixed transmission length method ensures clutter-less display, irrespective of the data length. The flagging of annotated events in arterial oxygen saturation, electroencephalogram and electrocardiogram illustrates the generic property of the algorithm. Data reduction of 87% to 99% and improved displays are demonstrated.

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Authors and Affiliations

  1. Faculty of Electrical Engineering, Universiti Teknologi MARA, Shah Alam, Malaysia

    L. Y. Khuan & Y. M. Salleh

  2. Division of Engineering University of Nottingham, Malaysia Campus Jalan Broga, 43500, Semenyih, Malaysia

    M. Bister & P. Blanchfield

  3. Neurology Unit, Medical Faculty Hospital University Kebangsaan Malaysia Jalan Yaacob Latif, Bandar Tun razak Cheras, Kuala Lumpur, Malaysia

    R. A. Ali & T. H. Chan

Authors
  1. L. Y. Khuan
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  2. M. Bister
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  3. P. Blanchfield
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  4. Y. M. Salleh
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  5. R. A. Ali
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  6. T. H. Chan
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Correspondence to M. Bister.

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Khuan, L.Y., Bister, M., Blanchfield, P. et al. Multiresolution wavelet analysis for efficient analysis, compression and remote display of long-term physiological signals. Australas. Phys. Eng. Sci. Med. 29, 216–228 (2006). https://doi.org/10.1007/BF03178896

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  • DOI: https://doi.org/10.1007/BF03178896

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