IMRT 2018
IMRT dynamic delivery
Picket fence test
• •
Test of MLC position and speed
• Deviations in MLC position => dosimetric deviation • Picket fence test is a combination of • Film/EPID (relative position of individual leaves) • Ion chamber at central axis (stable output)
Leaves move synchronously with constant speed and stop four times
Gantry
MLC movement
Film
IC
LoSasso MedPhys 28,2001. Comprehensive quality assurance for the delivery of intensity modulated radiotherapy with a multileaf collimator used in the dynamic mode
Made with FlippingBook - professional solution for displaying marketing and sales documents online