Coherent compounding in doppler imaging
作者： Ingvild K. Ekroll , Marco M. Voormolen , Oyvind K.-V. Standal , Jochen M. Rau , Lasse Lovstakken
DOI: 10.1109/TUFFC.2015.007010
关键词: Doppler effect 、 Optics 、 Physics 、 Doppler imaging 、 Blood flow 、 Signal 、 Acoustic Doppler velocimetry 、 Doppler echocardiography 、 Laser Doppler velocimetry 、 Signal-to-noise ratio (imaging)
摘要: Coherent compounding can provide high frame rates and wide regions of interest for imaging blood flow. However, motion will cause out-of-phase summation, potentially causing image degradation. In this work the impact on SNR accuracy Doppler velocity estimates are investigated. A simplified model compounded signal is proposed. The used to show that coherent acts as a low-pass filter signal, resulting in negatively biased estimates. Simulations flow phantom experiments quantify bias different velocities beam-to-flow (BTF) angles. It shown mean increases with increasing angle and/or velocity, whereas decreases; losses up 4 dB were observed investigated scenarios. Further, 2-D correction scheme proposed based multi-angle vector For 1.1 vNyq BTF 75°, was reduced from 30% less than 4% simulations. also applied vivo recordings, both cases substantially an dependent direction.
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