
A device called a transducer is passed over the scrotum, directing high-frequency sound waves (ultrasound) at the structures within, including the testicle, epididymis (the tube that transports sperm from the testicle), and blood vessels. The sound waves are reflected back to the transducer and electronically converted into real-time images displayed on a viewing monitor. These images are then saved on film or video and reviewed for abnormalities.