Abstract
Vibration amplitude sonoelastography imaging is an ultrasound imaging technique in which low frequency (100–500 Hz), low amplitude shear waves are propagated deep into tissue, while real time color Doppler techniques are used to image the resulting vibration field. A radio frequency ultrasound signal is phase modulated by a vibrating particle such that the peak vibration amplitude is directly proportional to the spread (standard deviation) of its power spectrum. A key application for this technique is the detection and imaging of small lesions. Finite element studies predict that a discrete hard inhomogeneity present within a larger region of soft tissue will cause a decrease in the vibration field at the location of the inhomogeneity. The inhomogeneity is made visible as a region of low vibration in the color Doppler image. The principles and practices of this technique are reviewed and results are shown for the detection and imaging of stiff thermal lesions induced in bovine calf liver.
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