Intravascular catheter with oscillating optical fiber for OCT imaging, rapid exchange, with a minimum length of 135cm; maximum outer diameter of 2.7F distally; shaft markers at 90 and 100cm, coated with a hydrophilic layer, compatible with a 0.014" guidewire, the proximal marker is 82mm from the lens marker, the distal marker is 20mm from the lens and 3mm from the tip of the catheter.