A direct comparison of time reversal and cross correlation for shear wave elastography

This work presents a direct comparison of time reversal (TR) and cross correlation (CC) for wave refocusing, with application to shear wave elastography. Standard theoretical equivalence relies on idealized assumptions, such as diffuse fields, that are rarely met in practice. A unified framework based on a reciprocal configuration to enable a direct, assumption-free comparison is proposed. A key distinction is drawn between active TR, requiring separate forward and backward wavefield acquisition