In what type of procedure is Tc MAA primarily used?

• A. Hormonal therapies
• B. Cardiac stress tests
• C. Radiological imaging
• D. Surgical procedures

Answer: (C)

Technetium-99m macroaggregated albumin (Tc MAA) is primarily utilized in radiological imaging procedures, particularly in lung perfusion studies. This radiopharmaceutical is designed to assess pulmonary blood flow and to identify areas of the lung that may not be receiving adequate blood supply. When injected into the bloodstream, Tc MAA aggregates in the capillaries of the lungs, allowing for visualization of pulmonary perfusion through imaging techniques.

This imaging capability is crucial not only for diagnosing conditions such as pulmonary embolism but also for preoperative assessments and other evaluations related to lung health. The property of Tc MAA to bind to the blood vessels effectively marks specific regions for imaging, making it an invaluable tool in the field of nuclear medicine.

Options related to hormonal therapies, cardiac stress tests, and surgical procedures do not pertain to the specific application of Tc MAA, which is focused on providing insights into lung perfusion and function through imaging techniques rather than treatment or other procedural contexts.