Estimating the total ultrasound attenuation along the propagation path by using a reference phantom

Area of Science:

• Medical Imaging
• Biomedical Ultrasound
• Acoustics

Background:

• Accurate estimation of ultrasonic attenuation in tissue is crucial for quantitative medical imaging.
• Previous algorithms required planar reflectors, limiting clinical applicability.
• Compensation for pulse transfer function, transducer characteristics, and diffraction is essential.

Purpose of the Study:

• To adapt a previously developed ultrasonic attenuation estimation algorithm for practical clinical settings.
• To re-derive the algorithm using tissue-mimicking phantoms for reference power spectrum acquisition.
• To enhance the robustness and usability of attenuation coefficient estimation in ultrasound diagnostics.

Main Methods:

• Modified an existing algorithm to utilize tissue-mimicking phantoms instead of planar reflectors for reference power spectrum.
• Tested the algorithm on simulated radio frequency (RF) echo lines from samples with varying scatterer properties.
• Validated the algorithm on two tissue-mimicking phantoms with different attenuation slopes using both single-element and clinical array transducers.

Main Results:

• Simulated data showed mean and standard deviation of attenuation coefficient estimates (ACEs) errors <5% and <10% respectively.
• Phantom studies with a single-element transducer yielded ACE errors <5% and <10%.
• Phantom studies with a clinical array transducer resulted in ACE errors <5% and <25%.

Conclusions:

• The modified algorithm provides practical and accurate ultrasonic attenuation estimation in clinical settings.
• Using tissue-mimicking phantoms is a viable alternative to planar reflectors for algorithm calibration.
• The algorithm demonstrates good performance across different transducer types and sample characteristics.