The scope of this invention leverages on novel, near-surface seismic techniques that were developed by MIT Lincoln Laboratory. Exploiting the polarity of the seismic excitation source and seismic receivers can significantly mitigate the signal interference created during conventional excitation processes. Hence, the signal returns from the shallow target, such as hematomas just under the skull, can yield a high signal-to-noise ratio and more resolved images. Viscosity abnormalities can be caused by serious internal injuries, such as contusion, traumatic brain injury, internal bleeding from concussive impacts, and stress induced fracturing from carrying heavy loads. Ultrasonic acquisition configurations and processing methods are designed to best exploit shear-wave phenomena to advance ultrasonic imaging capabilities for detecting and measuring abnormal viscosity changes in organ tissues. Blood viscosity changes in hematomas generate a shear-wave dispersion that differs from healthy tissue. Fractures and mass changes in bone impede direct surface waves and body shear-waves. Survey configurations that exploit reflected and refracted body waves and direct surface waves are used to estimate shear-wave dispersion.