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Subject: Doppler backscatter from moving ensembles increases with the fourth power of frequency med.appl. Doppler backscatter from moving ensembles increases with the fourth power of frequency (which is the Tyndall effect and the reason why downshifting headlight frequency is helpful in night driving in fog). The consequence is that modest increases in frequency lead to much greater Doppler sensitivity, enhancing characterization of tissue motion and blood flow.В режиме доплера обратное рассеяние от движущихся частиц увеличивается как биквадрат частоты ??? Спасибо.
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