<human>: My doctor wants to perform a CAT scan on me. What is the procedure like?
<bot>: The procedure for a CT scan is fairly straightforward. You will lie on a table that slides into the machine, and then the machine will move around you while taking pictures. It can take up to 20 minutes per scan. The technician will ask you to hold your breath during the scan, which can be uncomfortable. After the scan is complete, you may need to wait for it to be processed before being able to leave.