Welcome back to the RadOnc Smart Review Physics Series! In Episode P10, we defined the key descriptors of dose distribution – PDD for SSD setups and TMR for SAD setups – which tell us how dose varies with depth, energy, and field size relative to a reference point (dmax). Now, in Episode P11: MU Calculation Components, we'll assemble the rest of the puzzle pieces needed to actually calculate the Monitor Units (MUs) required to deliver the prescribed dose. We'll focus on output factors (Sc, Sp), equivalent squares, and factors for beam modifiers like wedges and trays.

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