Table 3 Mean gamma index (2 mm/3%), mean SSIM index, and subcomponent (luminance, contrast, structure) indices for the head and neck cases.

From: Application of error classification model using indices based on dose distribution for characteristics evaluation of multileaf collimator position errors

Head and neck

Gamma index

SSIM index

Luminance

Contrast

Structure

Systematic error

 0.5

0.9999

0.9366

0.9982

0.9997

0.9991

 1.0

0.9948

0.9360

0.9982

0.9997

0.9991

 1.5

0.9591

0.9346

0.9981

0.9997

0.9991

 2.0

0.9049

0.9323

0.9980

0.9997

0.9990

Random error

     

 0.0

1.0000

0.9361

0.9982

0.9997

0.9991

 0.5

0.9972

0.9362

0.9982

0.9997

0.9991

 1.0

0.9883

0.9357

0.9982

0.9997

0.9991

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