Efficient storage of urodynamic signals by computer: application of FAN adaptive sampling.
Digital storage of urodynamic signals such as detrusor pressure and flowrate at a sufficiently high sampling rate (10 samples per second) to allow subsequent analysis requires considerable computer memory. A procedure for compressing these data by deleting redundant samples (the fan method of adaptive sampling) was tested. The method allows a flexible adaptation to specific hardware and a compromise between storage requirements and accuracy. In this study the number of samples required for adequate reconstruction of the detrusor pressure signal could be varied from 80% to 4% of the original number of samples by varying the average difference between reconstructed and original signal from 0.01 to 2 cm H2O. Fast components of the measurements (for example cough peaks) which were lost if a lower sampling rate or averaging was used to obtain equally low storage requirements were unaffected by this compression technique.
van Mastrigt
R
R
Department of Urology, Erasmus University, Rotterdam, The Netherlands.
Griffiths
D J
DJ
D000465:Algorithms; D006801:Humans; D007256:Information Systems; D008492:Medical Informatics Computing; D012984:Software; D014563:Urodynamics