Described are methods and systems (40； 70) and system components useful for percutaneously delivering or retrieving vascular implant devices, such as filters (20), utilizing intravenous ultrasound (IVUS) imaging alone or in combination with external (e.g. transabdominal) ultrasound or other imaging technology. Implants deliverable by such systems, such as vena cava or other vascular filters (20), can have two or more echogenic markers (26, 27, 28) spaced at such a distance that they are separately discernible by IVUS and/or external ultrasound imaging.
