Which of the following statements accurately describes the role of radioactive isotopes in medical imaging?
A) Radioactive isotopes are used to measure the speed of light in a vacuum.
B) Radioactive isotopes help in the diagnosis and treatment of diseases by emitting radiation that can be detected by imaging devices.
C) Radioactive isotopes are primarily used in the development of new materials for spacecraft.
D) Radioactive isotopes are used to cool superconductors to extremely low temperatures.