![]() The technologist typically captures one or more frames of the moving pictures as still images. A computer instantly measures these signature waves and displays them as real-time pictures on a monitor. As the sound waves bounce off internal organs, fluids and tissues, the sensitive receiver in the transducer records tiny changes in the sound's pitch and direction. When the transducer is pressed against the skin, it sends small pulses of inaudible, high-frequency sound waves into the body. In an ultrasound exam, a transducer both sends the sound waves and records the echoing (returning) waves. This includes whether the object is solid or filled with fluid.ĭoctors use ultrasound to detect changes in the appearance of organs, tissues, and vessels and to detect abnormal masses, such as tumors. By measuring these echo waves, it is possible to determine how far away the object is as well as its size, shape, and consistency. When a sound wave strikes an object, it bounces back or echoes. Ultrasound imaging uses the same principles as the sonar that bats, ships, and fishermen use. It also considers what type of body structure and/or tissue the sound is traveling through. The computer creates the image based on the loudness (amplitude), pitch (frequency), and time it takes for the ultrasound signal to return to the transducer. The ultrasound image is immediately visible on a video monitor. 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. The images can also show blood flowing through blood vessels. Because ultrasound captures images in real-time, it can show the structure and movement of the body's internal organs. Ultrasound exams do not use radiation ( x-rays). A computer uses those sound waves to create an image. The probe collects the sounds that bounce back. High-frequency sound waves travel from the probe through the gel into the body. It uses a small probe called a transducer and gel placed directly on the skin. Ultrasound imaging is also called sonography. It produces pictures of the inside of the body using sound waves. Ultrasound imaging is a noninvasive medical test that helps physicians diagnose and treat medical conditions. In infants, the hip (which has a ball and cup configuration) is composed mainly of cartilage and is easily recognized on ultrasound. Ultrasound images of the hip provide pictures of muscles, tendons, ligaments, joints, bone and soft tissues of the hip.
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