ABSTRACT
The use of therapy beams for patient treatment requires that the dose can be determined at
any point within the patient. Because it is necessary to know beforehand what the dose
distribution will be, and it is impossible to perform measurements within the patient’s body,
one has to predict the dose from calculations. Methods for calculating the patient dose at any
point require a good understanding of the properties of clinical beams, and these issues are
presented in Part E. The methods for calculating the dose with a computer system and
the corresponding dose modelling are presented in Part F. To provide basic data for the
necessary dose models, a number of preliminary measurements must be performed on
the treatment machine. In practice, it is convenient to make a distinction between absolute
and relative dose measurements.
