Transmural Wave Speed Gradient May Distinguish Intrinsic Myocardial Stiffening From Preload-Induced Changes in Operational Stiffness in Shear Wave Elastography. - Annette Caenen; Stéphanie Bézy; Aniela Petrescu; Annegret Werner; Jens-Uwe Voigt; Jan D'hooge; Patrick Segers (IEEE Trans. Biomed. Eng., 2023)