Final answer:
The sweep technique is commonly used to calculate head circumference in ultrasound. The phased array technique improves image quality and accuracy in measurements.
Step-by-step explanation:
Head circumference measurement in ultrasound is typically calculated using the sweep technique.
In this technique, the ultrasound beam is swept across the area of interest, such as the head, to capture multiple measurements.
These measurements are then used to calculate the head circumference.
Additionally, the phased array technique is commonly used in ultrasound to create images of internal structures.
Multiple ultrasound sources in the probe's head are phased to interfere constructively in a specific direction, allowing for better image quality and accuracy in measurements.