A pelvic ultrasound is a scan that looks at the organs and structures in your pelvic area. Ultrasound uses a device called a transducer to send out sound waves that are too high to be heard. The transducer sends the sound waves through your skin and other body tissues to the organs and structures within. The sound waves bounce off the organs like an echo and return to the transducer. The transducer picks up the reflected waves. These are changed into a picture of the organs.