The gel allows sound waves to travel back and forth between the transducer and the area under examination. The technologist applies a small amount of gel to the area under examination and places the transducer there. The same principles apply to sonar used by boats and submarines. The transducer sends out inaudible, high-frequency sound waves into the body and listens for the returning echoes. Some exams may use different transducers (with different capabilities) during a single exam. The transducer is a small hand-held device that resembles a microphone. Ultrasound machines consist of a computer console, video monitor and an attached transducer. In children, pelvic ultrasound can help evaluate: In men and women, a pelvic ultrasound exam can help identify: See the Prostate Ultrasound page for more information. Transrectal ultrasound, a special study usually done to provide detailed evaluation of the prostate gland, involves inserting a specialized ultrasound transducer into a man's rectum. In men, a pelvic ultrasound is used to evaluate the: See the Sonohysterography page for more information. In this setting, three-dimensional ultrasound provides information about the outer contour of the uterus and about uterine irregularities, as well as information about the fallopian tubes and ovaries. Some physicians also use 3-D ultrasound or sonohysterography or Hysterosalpingo-Contrast-Sonography (H圜oSy) for patients with infertility.
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