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Extra resources for Intensity-Modulated Radiation Therapy
Example text
From the trajectory diagram the intensity (primary fluence assuming zero leaf transmission and scatter) between any locations xj and xj −1 , j = 1,. . g. the intensity between x2 and x3 is shown as three units. The same data are entered into the fifth row of the 2D IMB. The other four leaf pairs would require different trajectory diagrams (not shown). In this example all leaf pairs execute what is known as the ‘close-in’ technique. However alternative patterns of leaf segments could be combined to give exactly the same 2D IMB and this is discussed in detail in chapter 3.
IMRT of the breast can lead to better dose homogeneity and spare heart and lung. IMRT of the prostate could become routine. The dose models for IMRT are not accurate. Once a simple dose model has been used to create intensity-modulated fields, a full MonteCarlo dose calculation can be done just as for unmodulated radiotherapy. The IMRT plan created by inverse planning is modified by the IMRT delivery mechanism. This can be true but it is now possible to calculate the effects of most of the delivery mechanisms.
Popple and Rosen (2000) have presented a quite novel method of delivering multiple-field IMRT using ‘a’ compensator. 17b). This retains some of the inherent security attached to the use of compensators but at the same time employing a measure of automated computer control . 17. (a) Treatment of five intensity-modulated fields using a single attenuator. The area outside of the intensity-modulated region is blocked using a combination of the secondary jaws and the MLC. (b) Example transmission map for a five-field prostate case.
