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Online automated detection of cerebral embolic signals using a wavelet-based system.
| Content Provider | Semantic Scholar |
|---|---|
| Author | Marvasti, Salman Gillies, Duncan A. Marvasti, Farrokh Markus, Hugh S. |
| Copyright Year | 2004 |
| Abstract | Transcranial Doppler ultrasound (US) can be used to detect emboli in the cerebral circulation. We have implemented and evaluated the first online wavelet-based automatic embolic signal-detection system, based on a fast discrete wavelet transform algorithm using the Daubechies 8th order wavelet. It was evaluated using a group of middle cerebral artery recordings from 10 carotid stenosis patients, and a 1-h compilation tape from patients with particularly small embolic signals, and compared with the most sensitive commercially available software package (FS-1), which is based on a frequency-filtering approach using the Fourier transform. An optimal combination of a sensitivity of 78.4% with a specificity of 77.5% was obtained. Its overall performance was slightly below that of FS-1 (sensitivity 86.4% with specificity 85.2%), although it was superior to FS-1 for embolic signals of short duration or low energy (sensitivity 75.2% with specificity 50.5%, compared to a sensitivity of 55.6% and specificity of 55.0% for FS-1). The study has demonstrated that the fast wavelet transform can be computed online using a standard personal computer (PC), and used in a practical system to detect embolic signals. It may be particularly good for detecting short-duration low-energy signals, although a frequency filtering-based approach currently offers a higher sensitivity on an unselected data set. |
| Starting Page | 705 |
| Ending Page | 705 |
| Page Count | 1 |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://dev.pubs.doc.ic.ac.uk/embolic-signal-detection/embolic-signal-detection.pdf |
| Alternate Webpage(s) | http://pubs.doc.ic.ac.uk/embolic-signal-detection/embolic-signal-detection.pdf |
| PubMed reference number | 15183231v1 |
| Volume Number | 30 |
| Issue Number | 5 |
| Journal | Ultrasound in medicine & biology |
| Language | English |
| Access Restriction | Open |
| Subject Keyword | Carotid Stenosis Cerebrovascular Circulation Patients Personal Computers Structure of cerebral artery Structure of middle cerebral artery Ultrasonography Ultrasonography, Doppler, Transcranial Wavelet Analysis algorithm |
| Content Type | Text |
| Resource Type | Article |
