Following is used in PET scan:
**Core Concept**
A PET (Positron Emission Tomography) scan is a diagnostic imaging technique that utilizes a small amount of radioactive tracer to visualize metabolic processes within the body. The tracer is designed to accumulate in areas of high metabolic activity, such as tumors or inflamed tissues.
**Why the Correct Answer is Right**
The correct answer is likely a type of radioactive tracer, such as Fluorodeoxyglucose (FDG). FDG is a glucose analogue that is taken up by cells in proportion to their metabolic rate. Cancer cells, which have high metabolic rates, take up more FDG than normal cells, allowing for the detection of tumors using PET scans. The positron emission from the tracer is then detected by the PET scanner, creating a detailed image of the body's metabolic activity.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is not a specific radioactive tracer commonly used in PET scans.
* **Option B:** This option is incorrect as it is not a type of tracer used in PET scans.
* **Option D:** This option is not a specific radioactive tracer commonly used in PET scans.
**Clinical Pearl / High-Yield Fact**
It's essential to remember that PET scans are not only useful for detecting cancer but also for evaluating the effectiveness of cancer treatment and monitoring the progression of the disease.
**Correct Answer:** . 18F-Fluorodeoxyglucose (FDG)