Abstract
Most Doppler ultrasound systems employ quadrature demodulation techniques at the detection stage. The information concerning flow direction encoded in the phase relationship between in-phase and quadrature-phase channels is not obvious at this stage. Complex FFT can be used to obtain directional information in the frequency domain as well as time-frequency analysis of Doppler signals. However it has an inherent time-frequency resolution limitation. Wavelet transform allows the time-frequency resolution compromise to be optimized. Mapping directional information in scale domain is also desirable. A method based on the utilization of complex wavelets and negative scales has been described. It eliminates the intermediate processing stages for obtaining directional Doppler signals for time-scale analysis.
| Original language | English |
|---|---|
| Pages (from-to) | 251-256 |
| Number of pages | 6 |
| Journal | IEE Conference Publication |
| Issue number | 476 |
| DOIs | |
| Publication status | Published - 2000 |
| Externally published | Yes |
| Event | Interantional Conference on Advances in Medical Signal and Information Processing (MEDSIP 2000) - Bristol, UK Duration: 4 Sept 2000 → 6 Sept 2000 |