Physics Bucharest 2017
Summary Basic Dose Calculation Principles For equal number of MU : Dose decrease with depth (beyond d max ) Dose absorption and inverse square law Dose increase with larger field sizes More scatter to contribute to dose (Output factors) Dose decrease with larger SSD inverse square law Dose increase with energy (beyond d max ) less attenuation for higher energies Dose increase off central axis – most at d max Flattening filter, Beam spectrum is “softer” off axis (off axis factors)
less at depth.
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