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High frequency ultrasonic backscatter from erythrocyte suspension
IEEE Transactions on Bio-Medical Engineering
|January 1, 1994
Summary
Ultrasonic backscattering from red blood cells maintains a fourth-power frequency dependence up to 30 MHz, validating Rayleigh scattering theory for intravascular imaging applications. This finding confirms the predictable behavior of ultrasound scattering by red blood cells at higher frequencies.
Area of Science:
- Biomedical Engineering
- Acoustics
- Cellular Biophysics
Background:
- Rayleigh scattering theory predicts ultrasonic backscattering is proportional to frequency to the fourth power below 15 MHz.
- Red blood cell (RBC) ultrasound scattering may impact intravascular imaging device operation at higher frequencies.
Purpose of the Study:
- To investigate ultrasonic backscattering from porcine erythrocytes up to 30 MHz.
- To determine if the fourth-power frequency dependence of backscattering holds at higher frequencies.
- To assess the influence of RBC shape on ultrasound scattering.
Main Methods:
- Experimental measurement of ultrasonic backscattering coefficients for RBCs in saline up to 30 MHz.
- Theoretical computation of RBC backscattering cross-section using the T-matrix method.
- Modeling RBC shape as sphere, disc, and biconcave disc for theoretical analysis.
Main Results:
- Experimental results confirm the fourth-power frequency dependence of backscattering coefficient up to 30 MHz.
- T-matrix computations show good agreement with experimental data.
- RBC shape variations had a notable, but secondary, effect on scattering at higher frequencies.
Conclusions:
- The fourth-power frequency dependence of ultrasonic backscattering from RBCs is valid up to 30 MHz.
- Rayleigh scattering principles remain applicable for RBCs in this frequency range.
- Findings support the accurate operation of intravascular ultrasound imaging devices.