Magnetic resonance venography (MRV) is a noninvasive medical procedure used to visualize veins. An MR venogram uses the magnetic resonance imaging (MRI) scanner along with special computer software that captures images of blood cells as it passes through the veins. These images help diagnose blood clots, strokes, or other disease processes.
Before undergoing an MRI, alert your doctor if you have implants, metal clips, or other metallic objects in your body as these can be affected by the magnet. In some cases, an MR venogram may be done if you have metal devices such as a cardiac pacemaker.