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A PET scanner is a medical imaging machine that shows how tissues and organs are working inside the body. PET stands for positron emission tomography. The scan uses a small amount of radioactive tracer that collects in areas based on body activity, such as glucose use or blood flow. PET is often combined with CT or MRI to match activity patterns with detailed anatomy.
read more about pet scanner ...A tracer is given by injection, swallowing, or inhalation, depending on the exam type. The tracer releases signals that the PET scanner detects. A computer turns those signals into images that show areas of higher or lower activity. The timing between tracer delivery and scanning depends on the exam and body area being studied.
A PET scanner can be used in cancer care, heart disease evaluation, and brain disorder assessment. It can help find cancer, check whether it has spread, guide treatment planning, or monitor response to therapy. It can also help assess blood flow in the heart or brain activity patterns in selected conditions. The care team decides whether PET fits the clinical question and the patient's health status.
You can be asked to avoid food or strenuous activity before the scan, depending on the tracer used. After the tracer is given, there is often a waiting period while it moves through the body. During imaging, you lie still on a table that moves through the scanner. Tell the care team about pregnancy, breastfeeding, diabetes, kidney problems, allergies, or trouble lying still.
PET uses a small amount of radioactive material, so the scan should be ordered when the expected benefit outweighs the exposure. The tracer leaves the body over time, often through urine. Drinking fluids after the scan can help clear some tracers if the care team says it is safe. PET findings need clinical interpretation because infection, inflammation, healing tissue, or normal organ activity can affect results.
No. PET shows activity and function in tissues, while CT shows detailed anatomy using X-rays. PET and CT are often combined in one exam to give both types of information.
The scan itself should not hurt. You can feel a brief needle stick if the tracer is given through an IV.
Activity can change how some tracers collect in muscles and tissues. Resting helps the scan show the intended body activity more clearly.
You can have a small amount of tracer in your body for a short time after the scan. Follow the care team's instructions about fluids, bathroom use, and close contact with others if any precautions are needed.
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