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Machine related QA:
Small field effects
Small number of monitor units
Tongue and groove effects
Verify Leaf Positions
Output tolerance tighter
Isocenter, mechanical tolerance tighter (smaller target)
Dosimetric accuracy
Immobilization
79
ESTRO physics course 2017
IMRT quality assurance
ICRU 83
Patient specific QA A.2.3
Individual beams
No agreement on pass–fail criteria for the gamma value
Absorbed dose in Phantom
Dosimetric accuracy of 5%
Independent absorbed-dose calculation
The independent absorbed dose calculation must be able to
compute the absorbed dose in 3D so that the calculation can be
tested at a statistically relevant number of points
In vivo dosimetry
TLD, Diode, MOSFET, EPID Dosimetry
80