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.
KeywordsDynamic Time Warp Pulse Compression Chirp Signal Silicon Area Sidelobe Level
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