Vascular technicians or vascular sonographers operate diagnostic equipment using ultrasound to record vascular information such as vascular blood flow, blood pressure, limb volume changes, oxygen saturation, cerebral & peripheral circulation, abdominal circulation. Registration is offered by Cardiovascular Credentialing International,(CCI) as a Registered Vascular Specialist (RVS) or by the American Registry of Diagnostic Medical Sonographers(ARDMS) as a Registered Vascular Technologist (RVT) Citizenship. Citizenship of the United States. Non-citizens may only be appointed when it is not possible to recruit qualified citizens in accordance with VA Policy. Education. There are no specific educational requirements for this occupation. Education may be substituted for experience only at the G