Proposal and comparison of quality measures in Crawling Waves Sonoelastography

Area of Science:

• Medical Imaging
• Biomedical Engineering
• Ultrasound Technology

Background:

• Ultrasound shear-wave elastography is a non-invasive method for tissue stiffness assessment.
• Crawling Waves Sonoelastography (CWS) measures Shear Wave Speed (SWS) using mechanical waves.
• Current CWS techniques suffer from artifacts, potentially causing diagnostic errors.

Purpose of the Study:

• To propose and evaluate new quality parameters for CWS.
• To improve the accuracy and reliability of SWS measurements.
• To reduce artifacts and diagnostic inaccuracies in CWS.

Main Methods:

• Introduction of two quality parameters: coefficient of variation and normalized spectral deviation.
• Evaluation of these parameters on homogeneous and heterogeneous gelatin phantoms.
• Testing across a frequency range of 200 Hz to 500 Hz.

Main Results:

• The proposed quality parameters effectively reduce SWS variation.
• Contrast-to-Noise Ratio (CNR) can be increased by up to 6dB.
• Bias in SWS measurements is reduced by up to 20%.

Conclusions:

• The developed quality parameters enhance the reliability of CWS.
• These parameters enable the exclusion of inaccurate SWS measurements.
• This advancement improves diagnostic accuracy in ultrasound elastography.