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Percentage Depth Dose Curves (or PDDs) are used to determine how many Monitor Units (MU) a treatment machine needs to give (or how long the machine needs to be on) to deliver a particular dose to a particular depth. The depth at which the PDD curve peaks is referred to as dmax. Treatment machines are often calibrated so that 1MU = 1 cGy at dmax in water. ...


I am a medical physicist working in a Radiation Oncology department. MLCs are used for both 3D and IMRT plans. In fact, very few hospitals have the ability to make/use the lead blocks anymore. The MLCs define the shape of the radiation field. 3D treatment plans are generated with the user (often the MD) defining the MLC shapes for each gantry angle, and ...

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