Abstract
When prescribing radiotherapy dosage regimes in unusual circumstances, a therapist must usually resort to the use of such concepts as the nominal standard dose (Ellis, 1969) or other models, whereby the effective dose, distributed over a period of time in discrete fractions, may be calculated. Such unusual circumstances may include the establishment of new treatment techniques, the need for reduced numbers of fractions due to other treatment factors such as hyperbaric oxygen, anaesthesia, etc., or when holidays or machine breakdowns cause patterns to be disrupted.
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