What is the typical frequency range for diagnostic ultrasound?

The typical frequency range for diagnostic ultrasound falls within the range of 2 to 18 megahertz. This frequency range is chosen to optimize image resolution while also penetrating the tissues effectively. Lower frequency sound waves (such as those around 2 megahertz) are better for imaging deeper structures because they can penetrate more effectively but provide lower resolution images. Conversely, higher frequency sound waves (up to 18 megahertz) offer better resolution and detail for superficial structures but may not penetrate as deeply.

This balance is crucial in ultrasound imaging, as it determines the quality and clarity of the images produced for diagnostic purposes. Frequencies above 18 megahertz might be used for very superficial structures but are not typical for standard diagnostic practices. Frequencies below 2 megahertz are generally not utilized for diagnostic imaging because they do not provide adequate resolution.

Thus, the selected range of 2 to 18 megahertz represents the optimal compromise between penetration and resolution in medical ultrasound imaging, making it the most appropriate choice.