ARDMS (American Registry for Diagnostic Medical Sonography) Practice Test

What is the role of gel in ultrasound imaging?

1. To increase the color contrast in images

2. To eliminate air between the transducer and skin

3. To sterilize the skin surface before imaging

4. To enhance the durability of the transducer

The correct answer is: To eliminate air between the transducer and skin

In ultrasound imaging, the primary purpose of gel is to eliminate air between the transducer and the skin. Air is a poor conductor of ultrasound waves, which can lead to significant loss of signal and image quality. By applying gel, a medium is created that allows for better transmission of the ultrasound waves from the transducer into the body, as well as from the body back to the transducer. This ensures that the ultrasound waves effectively penetrate the skin and return clearer signals, thereby enhancing the quality of the images produced. The other options do not accurately reflect the gel's function in ultrasound. For instance, while contrast may be an important aspect of imaging, gel itself does not serve to increase color contrast; it primarily functions as a conductive medium. Additionally, gel is not used for sterilization processes prior to imaging; rather, it is used to facilitate the transmission of sound. Lastly, enhancing the durability of the transducer is also not a role of the gel; the gel is strictly for acoustic coupling, not for protective purposes.