Final answer:
Ultrasound technology is the radiographic technique that provides less radiation exposure to the thyroid gland and eyes because it uses sound waves, not ionizing radiation, and poses no radiation risk. Using short-lived isotopes in medical imaging also limits the dose due to their rapid decay.
Step-by-step explanation:
The radiographic technique that provides less radiation exposure to the thyroid gland and eyes is Ultrasound technology. Unlike CT scans and other imaging techniques that use ionizing radiation, Ultrasound uses sound waves and presents no radiation exposure to the patient, making it the most suitable choice for reducing radiation risks to sensitive organs like the thyroid gland and eyes.
Using short-lived isotopes in medical imaging can significantly lessen the radiation dose received by a patient. This is because short-lived isotopes decay more quickly, meaning that they stop emitting radiation sooner than isotopes with longer half-lives, thus reducing prolonged exposure to radiation.
It's important to note that while imaging techniques like SPECT provide good contrast, their use of ionizing radiation and the potential need for isotopes with longer half-lives could result in a higher radiation dose to the patient compared to Ultrasound, especially in areas like the thyroid gland which is sensitive to radiation.