What is a common use of Tc-99m in bone imaging?

• A. To assess joint health
• B. To detect bone metastasis or fractures
• C. To evaluate muscle tears
• D. To visualize soft tissue injuries

Answer: (B)

Tc-99m is widely used in bone imaging primarily for its ability to detect bone metastasis and fractures. The radiopharmaceutical is injected into the bloodstream, where it binds to areas of increased osteoblastic activity, which is often associated with metastatic disease or skeletal injuries. This property makes it particularly valuable for identifying regions within the bone that may be undergoing abnormal processes, such as tumor growth or traumatic injuries.

In the context of assessing bone health, the ability of Tc-99m to highlight abnormal metabolic activity allows clinicians to visualize sites of disease that other imaging methods may not detect. This is especially relevant for patients with cancer, as bone metastasis can occur, and early detection can significantly influence treatment strategies and outcomes. The technology leverages the gamma emissions from Tc-99m for high-resolution imaging, allowing for detailed analysis of the bone structure, thus proving critical in detecting both pathological fractures and metastases effectively.