IMRT 2018

Absolute dosimetry

• Reference field size: 10x10cm 2 • Equipment with non-standard reference field size • msr: machine specific reference • Usually the largest achievable field size • Correction factor accounting for changes in beam quality, depth of reference point, e.g. use of non-water phantom, …

Alfonso MedPhys 35, 2008. Reference dosimetry of small and nonstandard fields