Quality Management 2017
D EFINE
3. The IMRT pre-treatment QC process
MEASURE IN 2D
MEASURE IN 1D
Portal Dosimetry
IC PTW Semiflex (0.125cm 3 )
AS 500
• Detector:
M E A S U R E A N A L Y S I S
Exact Arm
• Method:
− Absolute dose in 1 pt
− Field by field
100cm
(gantry at 0 ° )
4 cm
• Indicator of comparison:
Gamma index ( ) passing rate criteria : 4% / 3mm
measured D D
calculated D
Difference
(%)
100
calculated
%0 (%)
• Target:
100%
* %
(%)
4
• Clinical specifications:
95%
* Zefkili, “Recommendations for a head and neck IMRT quality assurance protocol” Cancer/Radiother (2004) 03/10/17
38
12
Made with FlippingBook - Online Brochure Maker