What is PET scanning in malignant tissues and how does it work?

Question

Sir Yahya · Accepted Answer

**PET Scanning in Malignant Tissues**

**Introduction**  
PET (Positron Emission Tomography) is a nuclear imaging technique used to detect and diagnose malignant (cancerous) tissues in the body.

**Principle**  
- PET works by detecting gamma rays emitted from a radioactive tracer (e.g., FDG - Fluorodeoxyglucose) injected into the patient.  
- Cancer cells have higher metabolic activity and absorb more FDG than normal cells.

**Procedure**  
1. The patient is injected with a radioactive tracer.  
2. The tracer accumulates in areas of high metabolic activity (e.g., tumors).  
3. A PET scanner detects gamma rays emitted by the tracer and creates detailed images.

**Applications**  
- Detecting cancerous tumors.  
- Monitoring cancer treatment effectiveness.  
- Identifying metastasis (spread of cancer).

**Advantages**  
- Provides detailed metabolic information.  
- Helps in early cancer detection.

**Limitations**  
- Expensive and requires specialized equipment.  
- Exposure to radiation.

**Conclusion**  
PET is a valuable tool in oncology for diagnosing and managing malignant tissues.

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