In the context of medical procedures, which structure is commonly used as a tracer to visualize organ systems?

• A. Platelets
• B. Red blood cells
• C. White blood cells
• D. Radioactive isotopes

Answer: (D)

Verified step by step guidance

1. Understand the role of tracers in medical imaging: Tracers are substances used in medical imaging to highlight structures or functions within the body. They are often used in procedures like PET scans or SPECT scans to visualize organ systems.
2. Identify the characteristics of an effective tracer: An effective tracer should be detectable by imaging equipment, safe for the patient, and able to target specific tissues or organs.
3. Consider the options given: Platelets, red blood cells, and white blood cells are components of blood and do not inherently possess the properties needed to act as tracers in imaging.
4. Recognize the role of radioactive isotopes: Radioactive isotopes are commonly used as tracers because they emit radiation that can be detected by imaging equipment, allowing for the visualization of organ systems.
5. Conclude that radioactive isotopes are the correct choice for tracers in medical imaging, as they meet the necessary criteria for effective visualization of organ systems.