ABSTRACT
The ideal radiotherapy treatment plan produces a uniform coverage of the target volume
without giving a significant dose to surrounding normal tissue. The use of CT and MR in
treatment planning, and fast computer hardware (for both planning and treatment delivery)
has meant that 3D planning is a realistic option. More degrees of freedom in the use of nonco-
planar beam arrangements and the introduction of intensity modulation both make plans more
difficult to compare and evaluate. Good, fast plan evaluation tools are essential to simplify this
process. Several such tools have been designed, and will be discussed in this chapter.
