They will apply a water-based gel to the area under examination. The radiologist (a doctor trained to supervise and interpret radiology exams) or sonographer (a technologist specially trained in doing ultrasounds) will position you on the exam table. You may have to turn to either side to improve the quality of the images. A computer collects and processes the sounds and creates graphs or color pictures that represent the flow of blood through the blood vessels.įor renal ultrasound exams, you will lie face-up on an exam table. The movement of blood cells causes a change in pitch of the reflected sound waves (called the Doppler effect). They may also save short video loops of the images.ĭoppler ultrasound, a special ultrasound technique, measures the direction and speed of blood flow. 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 technologist presses the transducer against the skin, it sends small pulses of inaudible 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. By measuring these echo waves, it is possible to find out 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.
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