Three-Dimensional Photon Beam Calculations
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In radiation treatment of cancer it is necessary to: (a) accurately define the extent of disease, (b) customize radiation treatment delivery of required dose to diseased tissues while minimizing dose to normal surrounding tissue, and (c) verify that the delivered dose is the amount planned. Attention to all these issues is essential to design a treatment regimen that controls the disease without causing serious complications to normal critical structures. In most clinical cases direct measurement of the dose delivered to the tumor and normal tissue is not possible.Thus the radiation oncologist depends on the calculated dose distribution to evaluate the appropriateness of a particular treatment plan. Clinical studies have documented that small changes of ±5% in the dose delivered can result in significant differences in complication-free local control of disease (ICRU Report 24,1976).
KeywordsDose Distribution Energy Deposition Dose Calculation Scattered Photon Energy Fluence
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