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

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