What is the frequency range typically used in diagnostic ultrasound?

The frequency range typically used in diagnostic ultrasound is from 2 to 18 MHz. This range is optimal for imaging structures within the body, as higher frequencies provide better resolution and detail; however, they also have reduced penetration capability. Frequencies above 18 MHz, while excellent for superficial structures, are not commonly used for general diagnostic purposes due to their limited depth of penetration. Additionally, lower frequencies, such as those in the range of 0.5 to 2 MHz, are often used in specific applications like deeper structures or obstetric imaging, but they sacrifice resolution for depth, which is why the range from 2 to 18 MHz is preferred in routine diagnostic ultrasound scenarios. This combination allows for both adequate penetration and sufficient resolution to visualize the structures being examined effectively.