monitor unit calculation
The process of determining the number of monitor units required to deliver the prescribed dose for each treatment field.
Full Definition
Monitor unit (MU) calculation is a fundamental dosimetric procedure that determines the machine units needed to deliver the prescribed radiation dose. The calculation accounts for factors including field size, depth, patient separation, wedges, blocks, and machine output calibration. Modern treatment planning systems perform these calculations automatically, but medical physicists must verify the accuracy through independent calculation methods or secondary check software. MU calculations are critical for treatment safety and must be verified before treatment delivery to prevent dose errors that could harm patients or compromise treatment effectiveness.
In Context
- "Independent monitor unit calculation confirmed the planning system results." — Physics calculation check
- "Monitor unit calculations must be verified before first treatment." — Quality assurance protocol