In ultrasound, how is amplitude measured?

• A. Hertz
• B. Decibels
• C. Watts
• D. Millivolts

Answer: (B)

In ultrasound technology, amplitude is measured in decibels. The amplitude of the sound waves generated by the ultrasound transducer correlates to the strength of the echoes received and, subsequently, the quality of the image produced. Decibels provide a logarithmic scale to express these amplitude levels, allowing for a more manageable representation of a wide range of sound intensities.

Using decibels is particularly important in medical imaging because it relates closely to human perception of sound intensity and can help in describing the contrast and clarity of the ultrasound images. This unit of measurement is commonly used in various fields, including acoustics, to quantify sound intensity changes.

The other units listed—Hertz, Watts, and Millivolts—are used to measure different properties. Hertz measures frequency, Watts measures power output, and Millivolts measure electrical voltage. While all these measurements are important in the context of ultrasound technology, they do not apply to the measurement of amplitude specifically.