Figure 3From: Guidance and examination by ultrasound versus landmark and radiographic method for placement of subclavian central venous catheters: study protocol for a randomized controlled trial In-plane view (long axis) of guidewire placement in the subclavian vein using an infraclavicular approach. AV, axillary vein; GW, guidewire; Rib 1, acoustic shadow on the first rib; SCV, subclavian vein.Back to article page