What is the unit for area in ultrasound measurements?

The unit for area in ultrasound measurements is best represented in square centimeters, denoted as cm². This is because most measurements in ultrasound are performed on a scale that is suitable for the human body, where the dimensions of structures are typically within the centimeters range. Using cm² provides a clear, manageable unit that allows sonographers to express areas accurately without resulting in excessively large or small numbers, which can occur when using larger units like square meters (m²) or kilometers (km²).

While square millimeters (mm²) could theoretically be used, cm² is more common in clinical practice due to the size of the structures being measured. Similarly, square meters and square kilometers are generally used for larger measurement areas, which are not applicable in the context of ultrasound imaging. Therefore, the most appropriate and conventional choice in ultrasound for expressing area is square centimeters.