Which of the following methods is used to measure metabolic activity?a) Magnetic resonance imaging (MRI)b) Electroencephalography (EEG)c) Positron emission tomography (PET)d) Computed tomography (CT)e) X-ray imaging

The method used to measure metabolic activity from the options provided is c) Positron emission tomography (PET).

Here's a step-by-step explanation:

1. Magnetic resonance imaging (MRI): This method uses a magnetic field and radio waves to create detailed images of the organs and tissues within the body. It's primarily used for diagnosing abnormalities in soft tissues.

2. Electroencephalography (EEG): This method is used to record electrical activity of the brain. It's often used in the diagnosis of neurological disorders, but it doesn't measure metabolic activity.

3. Positron emission tomography (PET): This method uses a radioactive substance called a tracer to look for disease in the body. It allows the doctor to check for diseases in your body and see how your organs and tissues are functioning. Hence, it's used to measure metabolic activity.

4. Computed tomography (CT): This method uses a series of X-ray images taken from different angles around your body and uses computer processing to create cross-sectional images (slices) of the bones, blood vessels and soft tissues. It's more detailed than regular X-rays.

5. X-ray imaging: This method uses a small amount of radiation to produce images of the inside of the body. It's often used to diagnose or monitor conditions that affect the bones or chest, but it doesn't measure metabolic activity.