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Monitor unit

A monitor unit (MU) is a measure of machine output of a linear accelerator in radiation therapy.

Linear accelerators are calibrated for a specific energy such that 1 MU gives an absorbed dose of 1 centigray (or rad) at a depth of Dmax (or maximum dose) for a field size of 10x10 cm for a source-to-axis distance (SAD) of 100 cm. Some linear accelerators are calibrated using source-to-skin distance (SSD) instead of SAD. Monitor unit can be different for different sites.

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Monitor_unit". A list of authors is available in Wikipedia.
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