MODEL RELEASED. Ultrasound DVT scanning. Composite image of a radiologist's hand using an ultrasound transducer to scan a patient's leg for a deep vein thrombosis (DVT). Artworks on the patient's leg show the deep veins of the lower leg and the clot (thrombus, bulging area) that has formed. Ultrasound scanning is a diagnostic technique where ultrasound waves (high-frequency sound waves) from a transducer are reflected by body tissues. These echoes are detected by the transducer and used to build an image of structures inside the body.