CPT® Code 70545

Magnetic resonance angiography (MRA) is a specialized imaging technique that utilizes magnetic fields and radiofrequency pulses to create detailed images of blood vessels in the head. This procedure is particularly valuable for assessing both arterial and venous structures, allowing healthcare professionals to diagnose various vascular conditions. The use of contrast materials enhances the visibility of blood vessels, making it easier to identify abnormalities such as atherosclerotic stenosis, which is the narrowing of arteries due to plaque buildup, and arterial dissection, where the layers of an artery wall separate. Additionally, MRA can detect acute thrombosis, which refers to the formation of a blood clot within a blood vessel, as well as aneurysms or pseudo-aneurysms, which are abnormal bulges in the arterial wall. Other conditions that can be evaluated through this imaging technique include vascular loops, malformations, tumors, and arterial causes of pulsatile tinnitus, a condition characterized by hearing a rhythmic sound in the ears that often correlates with the heartbeat. MRA is also utilized post-vascular surgery to monitor the status of intracranial vessels. The procedure involves obtaining multiple images, typically 1-2 mm thick, which are then processed using advanced algorithms to create maximum intensity projections (MIPs). These MIPs provide a comprehensive view of the blood vessels, similar to traditional subtraction angiograms, allowing for detailed analysis by the radiologist. The entire process, including the administration of contrast material through an intravenous line, is carefully managed to ensure accurate imaging and interpretation of findings.