Yes, we will need to inject you with a tracer to help produce the scan. The tracer is usually a radioactive form of sugar, which stays in your body for several hours.
The technologist will give you the injection through the cannula (a small plastic tube) in your arm. You will then need to rest in the cubicle so that the injection can circulate around your body and build up in your tissues. This is known as the up-take period. Different scans have different rest periods:
body scan - 90 minutes
brain scan - 30 minutes
heart (cardiac) scan - 30-60 minutes.
While resting, you need to lie quietly and relax. You can sleep if you want to, or listen to music through headphones (please bring your own). You will not be allowed to read, because activity in the brain caused by reading can lead to increased up-take of radioactive tracer in the brain and affect the way the scan looks.
You can drink water and go to the toilet if you need to. Before the scan begins, the technologist will ask you to empty your bladder. He or she will then direct you to the scanning room.