Radiology, X-rays, CAT Scans and Other Medical Imaging

Overview of Medical Imaging, Radiation, X-Rays, CAT Scans, Fluoroscopy, MRI Scans, Mammography & Ultrasound Imaging

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Medical Imaging: Ultrasound

Ultrasound imaging (sonography) uses high-frequency sound waves to view soft tissues such as muscles and internal organs. Because ultrasound images are captured in real-time, they can show movement of the body's internal organs as well as blood flowing through blood vessels.

In an ultrasound exam, a hand-held transducer is placed against the skin. The transducer sends out high frequency sound waves that reflect off of body structures. The returning sound waves, or echoes, are displayed as an image on a monitor. The image is based on the frequency and strength (amplitude) of the sound signal and the time it takes to return from the patient to the transducer. Unlike with an x-ray, there is no ionizing radiation exposure with this test.

Ultrasound Imaging Procedures

Ultrasound imaging is used in many types of examinations and procedures. Some examples include

  • Doppler ultrasound (to visualize blood flow through a blood vessel)
  • Bone sonography (to diagnose osteoporosis)
  • Echocardiogram (to view the heart)
  • Fetal ultrasound (to view the fetus in pregnancy)
  • Ultrasound-guided biopsies
  • Doppler fetal heart rate monitors (to listen to the fetal heart beat)

Risks and Benefits of Ultrasound Imaging

Ultrasound imaging has been used for over 20 years and has an excellent safety record. It is non-ionizing radiation, so it does not have the same risks as x-rays or other types of ionizing radiation.

Even though there are no known risks of ultrasound imaging, it can produce effects on the body. When ultrasound enters the body, it heats the tissues slightly. In some cases, it can also produce small pockets of gas in body fluids or tissues (cavitation). The long-term effects of tissue heating and cavitation are not known.

Because of the particular concern for fetal exposures, national and international organizations have advocated prudent use of ultrasound imaging. Furthermore, the use of diagnostic ultrasound for non-medical purposes such as fetal keepsake videos has been discouraged.

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