Useful Techniques for Tomotherapy Treatment Planning

摘要

We demonstrated that certain optimization strategies, not necessarily following the commonly used ap-proaches, could help in some cases to produce desirable do-simetric results in an efficient manner. We describe the effects of assigning a Region At Risk (RAR) as a primary target with a low prescription dose in the case of a salvage treatment to the prostate. The effect of assigning the urethra as a complete block as opposed to the RAR is examined for the boost phase of the same case. Optimization time can be reduced by first satisfying the RAR DVH objectives, while paying no attention to the primary tumor at all. After the RAR DVHs are close to desired, the tumor dose can be optimized quickly, without substantial deterioration of the RAR dosimetry. This is an opposite approach from the typical inverse planning, where an attempt to achieve conformal target dose is made first.