Final answer:
Ultrasound is the preferred imaging technique to visualize the thyroid gland safely and effectively, due to its non-invasive nature and lack of ionizing radiation.
Step-by-step explanation:
To improve the visualization of the thyroid gland in the anterior view, the safest and most commonly used imaging technique is ultrasound. Ultrasound uses high-frequency sound waves to generate real-time images of the anatomy, including soft tissues like the thyroid gland. It is the least invasive method and does not use ionizing radiation, which makes it safe even during pregnancy.
Additionally, a specialized thyroid scan can be performed using radioactive iodine, typically with isotopes like Na¹³¹I or Na¹²³I, which are taken up by the thyroid gland and can provide detailed images via the decay of these isotopes. While other methods such as MRI, CT scans, and X-rays can visualize the thyroid, ultrasound is the preferred initial technique due to its safety profile and effectiveness in thyroid imaging.