Medical Ultrasound Imaging Using Pulse Compression and Depth-Dependent Mismatched-Filtering
In conventional medical ultrasonic imaging, the signal-to-noise ratio (SNR) as well as the penetration depth are insufficient for many diagnostic cases. In pulse-echo ultrasonic imaging tissue heating is negligibly small, whereas there is a potential for acoustic cavitation at peak intensities currently used in ultrasonic imaging1. Therefore improving the SNR by increasing the peak intensity of the acoustic signal is not possible. This restriction can be cir- cumvented by using elongated, coded signals with high average energy at moderate peak intensity 2,3. Frequency-modulated chirps are suitable signals for this purpose.
KeywordsAttenuation Cavitation Deconvolution Acoustics Lewin
Unable to display preview. Download preview PDF.
- 2.B. Haider, P.A. Lewin and K.E. Thomenius, Pulse elongation and deconvolution filtering for medical ultrasonic imaging, IEEE Proc. UFFC, 1303(1995).Google Scholar
- 5.H.D. Lüke, Korrelationssignale, Springer-Verlag Berlin(1992).Google Scholar
- 7.S. Mita, R. Shimokawa, T. Matsuura, H. Sawaguchi, S. Miyazawa and K. Hikasa, A 150Mb/s PRML chip for magnetic disk drivers, IEEE International Solid-State Circuits Conference, 39:62(1996).Google Scholar
- 8.W. Wilhelm and T.G. Noll, A new mapping technique for automated design of highly efficient multiplexed FIR digital filters, To be published in: IEEE International Symposium on Circuits and Systems(1997).Google Scholar
- 9.A.R. Brenner, K. Eck, G. Engelhardt and T.G. Noll, Phase aberration correction using dynamic time warp-ing, IEEE Proc. UFFC, 1361(1995).Google Scholar