Physics Athens 2016

Error detection and acceptance criteria

Compression of a gamma value image into one single quality value for IMRT delivery

Measurement (Film,EPID)

Example: Passing rate -Passing rate is always related to its Region of interest. -Information about the distributions of erroneous pixels is lost -Very sensitive parameter

Gamma Value Image

Region of interest

x = MLC Outline Mask or 10% of MAX threshold (PTV oriented)

Calculation (TPS,PDIP)

Gamma Value Calculation

Passing rate Percentage of pixels having gamma value <1 in open MLC area

11/22/11

80