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Ultrasound is a continually developing technology that is broadly used forfast, non-destructive mechanical property detection of hard and soft materialsin applications ranging from manufacturing to biomedical. In this study, anovel monostatic longitudinal ultrasonic pulsing elastography imaging method isintroduced. Existing elastography methods require an acoustic radiational ordynamic compressive externally applied force to determine the effective bulkmodulus or density. This new, passive M-mode imaging technique does not requirean external stress, and can be effectively utilized for both soft and hardmaterials. Strain map imaging and shear wave elastography are two currentcategories of M-mode imaging that show both relative and absolute elasticityinformation. The new technique is applied to hard materials and soft materialtissue phantoms for demonstrating effective bulk modulus and effective densitymapping. As compared to standard techniques, the effective parameters fallwithin 10% of standard characterization methods for both hard and softmaterials. As neither the standard A-mode imaging technique nor the presentedtechnique require an external applied force, the techniques are applied tocomposite heterostructures and the findings presented for comparison. Thepresented passive M-mode technique is found to have enhanced resolution overstandard A-mode modalities.

Enhanced Instantaneous Elastography in Tissues and Hard Materials Using  Bulk Modulus and Density Determined without Externally Applied Material  Deformation