Quantitative Methods 2017

Radiomics (PET-CT)

Texture analysis of OAR (model performance)

Van Dijk, et al. Radiother Oncol 2017

Model performance measure

Model

Reference model

(PG dose and BLX)

Reference model

+ P90

Reference model

+ LRHG3E

-2 log-likelihood

184.51

175.30

174.31

Nagelkerke R

0.22

0.28

0.29

Area Under the Curve (AUC)

0.73

0.77

Hosmer-Lemeshow test X

(p-

value)

11.22 (0.19)

6.72 (0.57)

6.30 (0.61)

LRHG3E = Long Run High Grey- level Emphasis 3: long repetitions of high SUVs are present in the

parotid gland

P90 = the 90th percentile of SUVs