Angular spatial compounding of diffraction corrected images improves ultrasound attenuation measurements

Area of Science:

• Medical Imaging
• Biophysics
• Ultrasound Technology

Background:

• Breast cancer remains a significant cause of mortality in women.
• Quantitative ultrasound (QUS) and ultrasound computed tomography (USCT) are advanced imaging modalities for breast cancer assessment.
• Ultrasound attenuation imaging is crucial for characterizing breast tissue and lesions.

Purpose of the Study:

• To compare the efficacy of spectral log difference (SLD) with full angular spatial compounding (FASC) against full wave inversion (FWI) for generating ultrasound attenuation images.
• To evaluate the performance of SLD-FASC and FWI in estimating lesion sizes and attenuation values in breast tissue.
• To determine if SLD-FASC offers superior accuracy and reduced variance in quantitative ultrasound imaging of the breast.

Main Methods:

• Implementation of SLD combined with FASC using raw in-phase and quadrature data on the QTI Breast Acoustic CT Scanner.
• Comparison of SLD-FASC with FWI through simulations, phantom experiments, and in vivo breast imaging.
• Quantitative analysis of lesion size estimation accuracy, image variance, and mean absolute error (MAE) for attenuation values.

Main Results:

• SLD demonstrated improved accuracy in estimating breast lesion sizes compared to FWI.
• SLD-generated images exhibited significantly lower variance and mean absolute error (MAE) in attenuation values.
• MAE for attenuation values was reduced by approximately three times using SLD compared to FWI in phantom studies.

Conclusions:

• SLD combined with FASC is a superior technique for quantitative ultrasound attenuation imaging of the breast compared to FWI.
• This advanced QUS method offers enhanced accuracy and reliability for breast cancer detection and characterization.
• The findings support the clinical utility of SLD-FASC for improved breast cancer management through quantitative ultrasound imaging.