A thyroid bar, also referred to as a thyroid collar or neck shield, is an essential protective gear used in medical imaging procedures. This device is designed to shield the thyroid gland, located in the neck, from exposure to harmful radiation. While "thyroid bar" is one commonly used term, it is worth mentioning some synonyms for this protective gear. These include "thyroid shield", "neck apron", "collar shield", and "thyroid protector". These alternate names all refer to the same purpose, which is to safeguard the thyroid gland from unnecessary exposure during x-rays, CT scans, and other medical imaging processes.