Intravascular ultrasound imaging, in which a catheter-based miniature sonographic transducer is introduced into vessels, provides high-resolution, cross-sectional, real-time imaging of the vessel wall and lumen. It has been found to be useful as both a diagnostic and therapeutic adjunct in the evaluation and management of various arterial and venous disorders. Used in conjunction with other imaging modalities, such as conventional angiography, spiral computed tomography, and magnetic resonance angiography, it has the potential to increase the accuracy of percutaneous interventions and device sizing.