The United States Navy continues to use several first-generation SlimLine monitor units today.
2.
It consisted of four independently controlled source monitor units ( the precursor to source measure units ) enclosed in a mainframe.
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Solid state controllers are required to have an independent " conflict monitor unit " ( CMU ), which ensures fail-safe operation.
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Modern radiotherapy is performed using isocentric treatment plans, so newer definitions of the monitor unit are based on geometry at the isocentre based on the source-to-axis distance ( SAD ).
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Some linear accelerators are calibrated using source-to-axis distance ( SAD ) instead of source-to-surface distance ( SSD ), and calibration ( monitor unit definition ) may vary depending on hospital custom.
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Once the treatment planner has made an initial plan, the treatment planning system calculates the required monitor units to deliver a prescribed dose to a specific area, and the distribution of dose in the body this will create.
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