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Article Dans Une Revue IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control Année : 2016

Tissue attenuation estimation by mean frequency downshift and bandwidth limitation

Résumé

Attenuation of ultrasound in tissue can be estimated from the propagating pulse center frequency downshift. This method assumes that the envelope of the emitted pulse can be approximated by a Gaussian function and that the attenuation depends linearly on frequency. The resulting downshift of the mean frequency depends not only on attenuation, but also on pulse bandwidth and propagation distance. This kind of approach is valid for narrowband pulses and shallow penetration depth. However, for short pulses and deep penetration, the frequency downshift is rather large and the received spectra are modified by the limited bandwidth of the receiving system. In the paper the modified formula modelling the mean frequency of backscattered echoes is presented. The equation takes into account the limita- tion of the bandwidth due to band-pass filtration of the received echoes. This approach was applied to simulate the variation of the mean frequency of the pulse propagating for both: weakly and strongly attenuating media and for narrowband and wideband pulses. The behavior of both the standard and modified estimates of attenuation has been validated using RF data from a tissue- mimicking phantom. The ultrasound attenuation of the phantom, determined with a corrected equation, was close to its true value, while the result obtained using the original formula was lower by as much as 50% at a depth of 8cm.
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Dates et versions

hal-03192827 , version 1 (14-04-2021)

Identifiants

Citer

Ziemowit Klimonda, Michiel Postema, Andrzej Nowicki, Jerzy Litniewski. Tissue attenuation estimation by mean frequency downshift and bandwidth limitation. IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, 2016, 63 (8), pp.1107-1115. ⟨10.1109/TUFFC.2016.2574399⟩. ⟨hal-03192827⟩
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