ABSTRACT
The technology of electronic portal imaging devices (EPIDs) was discussed in Chapter 14.
The development of these devices has opened up new possibilities for quality assurance of
treatment technique and for verification of treatment accuracy. The clinical usefulness of EPIDs
depends on the availability of good quality images for analysis and the availability of methods
of analysing the images obtained at the computer software level. The analysis should yield a
quantitative verification of treatment quality. This verification may be in terms of patient
positioning or dosimetry.
