Which modality uses radioactive materials for diagnostic or therapeutic purposes?

Which modality uses radioactive materials for diagnostic or therapeutic purposes?

• A. Bone Densitometry
• B. Nuclear Medicine
• C. Computed Tomography
• D. Radiation Therapy

Answer: (B)

Nuclear medicine uses radiopharmaceuticals to visualize how organs and tissues function, not just how they look structurally. A small amount of radioactive material is given to the patient and distributes in the body according to physiology, so cameras can detect the emitted radiation and produce images that reflect metabolic activity and function. This approach lets clinicians see processes like bone turnover, organ perfusion, or receptor activity, and it also enables targeted therapy with therapeutic radiopharmaceuticals. For example, bone scans use technetium-99m to highlight areas of bone metabolism, thyroid imaging uses iodine-based tracers, and PET imaging often uses fluorine-18 labeled glucose to show metabolic activity. Therapeutically, radiopharmaceuticals such as I-131 for thyroid disorders, Lu-177 for certain tumors, or Y-90 microspheres are used to treat disease. This combination of diagnostic imaging and targeted treatment with radioactive materials distinguishes nuclear medicine from modalities that rely on external X-rays for anatomy or external beam radiation.

Nuclear medicine uses radiopharmaceuticals to visualize how organs and tissues function, not just how they look structurally. A small amount of radioactive material is given to the patient and distributes in the body according to physiology, so cameras can detect the emitted radiation and produce images that reflect metabolic activity and function. This approach lets clinicians see processes like bone turnover, organ perfusion, or receptor activity, and it also enables targeted therapy with therapeutic radiopharmaceuticals. For example, bone scans use technetium-99m to highlight areas of bone metabolism, thyroid imaging uses iodine-based tracers, and PET imaging often uses fluorine-18 labeled glucose to show metabolic activity. Therapeutically, radiopharmaceuticals such as I-131 for thyroid disorders, Lu-177 for certain tumors, or Y-90 microspheres are used to treat disease. This combination of diagnostic imaging and targeted treatment with radioactive materials distinguishes nuclear medicine from modalities that rely on external X-rays for anatomy or external beam radiation.