Final answer:
Ultrasonography is the most widely used technique for determining gestational age as it is safe, non-invasive, and provides detailed images of the fetus and placenta.
Step-by-step explanation:
The most widely used technique for determination of gestational age is ultrasonography.
Using high-frequency sound waves, ultrasonography is an imaging technology that produces real-time images of anatomy and physiology. Among all imaging modalities, it is the least invasive and is frequently employed in delicate circumstances like pregnancy. Because ultrasound imaging is safe, non-invasive, and offers precise images of the fetus and placenta, it is the method of choice for researching fetal growth and development. It enables medical professionals to precisely ascertain gestational age and track the fetus's growth. One slight disadvantage of ultrasonography is that it cannot penetrate gas or bone, and its image quality is very operator dependent.