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Journal of Telemedicine and Telecare

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J Telemed Telecare 2008;14:342-344
doi:10.1258/jtt.2008.007004
© 2008 Royal Society of Medicine Press

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RESEARCH

Original articles

Validation of an automatic tool for the assessment of image quality in digital tele-echocardiography

Daniele Giansanti * , Andrea Giordano {dagger} and Sandra Morelli *


* Dipartimento di Tecnologie e Salute, Istituto Superiore di Sanità, Rome; {dagger} Fondazione Maugeri, Pavia, Milano, Italy

Correspondence: Daniele Giansanti, Istituto Superiore di Sanità, Dipartimento di Tecnologie e Salute, Via Regina Elena 299, Roma, Italy (Fax: +39 064 938 7079; Email: daniele.giansanti{at}iss.it)

We investigated a novel tool for assessing image degradation in tele-echocardiography. Different video recordings from an echocardiographic examination were transmitted using commercial videoconferencing equipment via a local area network. Different compression schemes were selected, ranging from MPEG 1 to MPEG 4, with transmission at different bit rates ranging from 1.0 to 4.5 Mbit/s. Three methods were used to compare the transmitted and received video sequences: the peak signal to noise ratio, the Double Stimulus Impairment Scale (DSIS) and the National Telecommunication and Information Administration Virtual Quality Metric (VQM). The results showed that the most useful grading procedure was the subjective DSIS. There was a high correlation between the DSIS results and the VQM. The VQM could be thus an effective tool for evaluating tele-echocardiography transmission systems, avoiding the costs and times associated with conducting subjective tests in repeatable conditions.


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