Abstract
A simulation study is presented which investigates the possibility of obtaining better spatial resolution and similar or improved statistical performance from a coded waveform compared to a continuous frequency (CF) narrowband pulse for Colour Flow Imaging (CFI) applications. Our attention is focused on Linear Frequency Modulated (LFM) chirps. We show that it is possible to improve the spatial resolution and the Signal to Noise Ratio (SNR) conditions with moderately long LFM chirps (10 mu s), but an increase in spatial resolution strongly limits the SNR gain provided by the coded excitation signal over conventional long CF pulses. We then study through simulations the possible impact of using LFM chirps for velocity estimation with two standard phase domain algorithms, the Kasai algorithm and the modified autocorrelation. The use of coded excitation is beneficial in terms of statistical performance for a rather low range of SNR (5-10 dB). For a medium range of SNR (20-30 dB) the performance of phase domain estimators appears to be essentially driven by the bandwidth of the transmitted waveform, which suggests a trade-off between resolution and performance in the use of coded waveforms with this type of estimator.
| Original language | English |
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| Title of host publication | 2007 IEEE ULTRASONICS SYMPOSIUM PROCEEDINGS, VOLS 1-6 |
| Place of Publication | NEW YORK |
| Publisher | Institute of Electrical and Electronics Engineers (IEEE) |
| Pages | 1251-1254 |
| Number of pages | 4 |
| ISBN (Print) | 978-1-4244-1383-6 |
| Publication status | Published - 2007 |
| Event | IEEE Ultrasonics Symposium - New York Duration: 28 Oct 2007 → 31 Oct 2007 |
Conference
| Conference | IEEE Ultrasonics Symposium |
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| City | New York |
| Period | 28/10/07 → 31/10/07 |