Physics Bucharest 2017

6/3/2017

IMRT quality assurance

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

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