You will then begin the normal treatment planning process. A bean-bag "cast" will be made for you to lie in during planning and treatment. This is done to lower day-to-day changes in your position. A CT scan will be taken with you breathing quietly, and possibly several X-rays will be performed as well. You will be marked with magic marker, and possibly have several permanent tattoos placed to help with daily positioning. These procedures normally take 1-2 hours.