IMRT is a form of ‘conformal’ radiation therapy. The radiation beams are shaped to surround the treatment area as they come out of the treatment machine, avoiding unnecessary radiation being delivered to surrounding tissue. IMRT is technically demanding and requires a high level of precision. For this reason, you will be asked to attend for a computed tomography (CT) scan in a particular position. The Radiation Therapists and Radiation Oncologists will determine if any additional equipment will be required in order for you to stay in the correct position. Developing the ideal plan for each patient can be a complex, time-consuming process. This means that you may be unable to start your radiation therapy treatment straight away after your CT scan appointment.