Online automated detection of cerebral embolic signals using a wavelet-based system
- 作者：Marvasti ; Salman ; Gillies ; Duncan ; Marvasti ; Farokh ; Markus ; Hugh S.
- 关键词：Applied wavelets ; Daubechies ; Transcranial Doppler ultrasound ; Automatic detection ; Cerebral embolism
- 刊名：Ultrasound in Medicine and Biology
- 出版年：2004
- 期刊代码：82_03015629
- 类别：ph
- 出版时间：May, 2004
- 卷：30
- 期：5
- 页码：647-653
- 文件大小：252 K
摘要
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. (E-mail: mailto:h.markus@sghms.ac.uk)