chapter  2
40 Pages


As already indicated (section 1.1.4) the delivery of IMRT is possible by several techniques and, during the past decade, three have been front runners. These form the subject of the next three chapters although, as will become clear, some overlap and possible confusion of terminology leads to a precise classification being unreachable (see e.g. section 2.2). In this chapter, we shall consider the two methods by which IMRT is delivered via an arcing gantry equipped with a multivane collimator residing in a narrow fan beam of radiation. These could be classified as ‘rotation IMRT’ and share similar features albeit with important distinctions. The first method is IMRT via the use of the NOMOS MIMiC equipment and the second is the development of the University of Wisconsin machine for ‘tomotherapy’. Given that the word ‘tomotherapy’ means ‘slice therapy’ it could also be used generically to embrace the first method.