Figure 2From: Ultrasonic reflection coefficient and surface roughness index of OA articular cartilage: relation to pathological assessment Schematic of calculation of ultrasound roughness index (URI). (a) Ultrasound RF signal reflected from the articular cartilage tissue; (b) Schematic of the scanning scope of ultrasound probe; (c) An ultrasound microscopic image of cartilage tissue.Back to article page