Perforator of Duplex ultrasound image: a perforator arising from the radial artery between the brachioradialis muscle and pronatorteres muscle in the proximal half of forearm. Diameter(+): the internal diameter of the perforator; Pedicle length(×): the pedicle distance from its origination of radial artery to deep fascia; RA radial artery; P perforator; BR brachioradialis muscle; PT pronatorteres muscle