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- W2411468967 abstract "In treatment planning of radiation fields, it is essential to know the dose received at various tissue levels in the irradiated volume. For a certain radiation quality and source to skin distance, radiation dose at maximum build-up or at a depth in tissue is a function of the size and shape of the radiation field. It has been established that the quilibrium dose as the depth dose along the central axis of the beam for a rectangular field can be determined by applying the equivalent square technique. The approximation method of area/perimeter of different portal sizes used in practice for finding the equivalent squares of a rectangular field has been tested on a 35 MV Clinac Linear Accelerator for the purpose of treatment planning. Data were taken for 8 and 25 MV x-rays at depths of maximum build-up regions and at 10 cm depth below the surface of an adequate water phantom. Maximum variation of dose calculation from the above method is less than 1.6% for routine clinical usage, while less than 3.2% for extreme rectangular field sizes. Dose variation is improved as the depth in phantom is increased." @default.
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- W2411468967 date "1980-01-01" @default.
- W2411468967 modified "2023-09-27" @default.
- W2411468967 title "The application of the approximation method of equivalent square for magavoltage photon beams." @default.
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