D planning

Perhaps the most significant change in radiotherapy practice in the past 15 years has been the direct use of CT scanning for planning. The advantages of CT planning are significant:

♦ Tumour and critical structures are more readily defined

♦ Dose calculation is more accurate

♦ The planning process is truly 3D, offering more options for optimizing the treatment plan

In certain circumstances, adequate coverage of the target whilst avoiding critical organs can only be achieved using beams that are non-coplanar; these calculations can only be performed in 3D utilizing the CT information.

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