Sonoelastic determination of the knee cartilage elasticity
Keywords:
sonoelasticity, Doppler effect, human knee, cartilageAbstract
Sonoelasticity and Doppler imaging are applied in this paper to detect the damage process of the knee cartilage. The cartilage is a firm, thick, slippery tissue that acts as a protective cushion between bones. It is present on the ends of the bones and at the back of the patella and provides low friction in distributing of loads and maximal consistency between the joint surfaces. Sonoelasticity utilizes an external source to vibrate the knee at low frequency. Vibrations and local motions induced in the cartilage are detected and visualized by Doppler ultrasound by real-time images of normal vibration eigenmodes. The vibration images depend on the vibration frequency, the cartilage structure and elastic properties. Doppler ultrasound detects the vibration amplitudes from the echoes reflected from the cartilage and surrounding tissues. The prediction of small inhomogeneities in the damaged cartilage is compared with theoretical/ experimental data available in literature.
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