MHz stands for what?

MHz stands for what?

• A. Number of sound waves per second
• B. Frequency of tissue motion
• C. Wavelength in water
• D. Amplitude of vibration

Answer: (A)

MHz is a frequency unit: megahertz means one million cycles per second. In ultrasound, this describes how often the sound wave repeats each second—the number of wave cycles passing a point each second. That’s why it corresponds to the number of sound waves per second. It’s not about the wavelength (which is the distance between peaks), not about how strong the vibration (amplitude) is, and not about tissue motion frequency. In therapy, common frequencies like 1 and 3 MHz refer to how frequently the wave cycles per second, affecting depth of penetration.

MHz is a frequency unit: megahertz means one million cycles per second. In ultrasound, this describes how often the sound wave repeats each second—the number of wave cycles passing a point each second. That’s why it corresponds to the number of sound waves per second. It’s not about the wavelength (which is the distance between peaks), not about how strong the vibration (amplitude) is, and not about tissue motion frequency. In therapy, common frequencies like 1 and 3 MHz refer to how frequently the wave cycles per second, affecting depth of penetration.