Hi - CT scans are a standard method for sizing and monitoring and generally evaluating tumours. You can't really prepare for it. It takes about 10-15 mins. Injecting dye into the blood stream is normal. Sometimes there's a contrast to drink an hour before hand as well. You lie flat on your back and the bed moves through a circular scanning machine. You're asked to hold your breath a few times for a sharp image. You have to wait for 10 mins afterwards to check there is no adverse reaction. It's not painful or uncomfortable. The radiologist writes a report afterwards and sends it to your consultant. They should have an appt with you to discuss the results about a couple of weeks after.
Metal is unwanted in the image so I always wear a vest bra with no fastenings and hitch my jeans down. They have some sheets to preserve dignity.
