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Some organs, such as the prostate, move within the patient from day to day and even within a given day. As a result, a previously developed treatment plan may no longer be effective. Treatments that require daily localization of this kind include those for cancers of the prostate, female pelvis, pancreas, breast and liver.
The conventional approach to this problem is to include in the treatment plan a margin of error, which leads to exposing healthy tissue to radiation. on-board CT scanning enables this margin of error to be reduced significantly, and can be used in conjunction with IMRT as well as conventional radiation treatment.
