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Table 4 Overlap volume histogram (OVH) and target volume histogram (TVH) used as inputs to build neural network model

From: A knowledge-based intensity-modulated radiation therapy treatment planning technique for locally advanced nasopharyngeal carcinoma radiotherapy

OVH

OAR

Target volume

Starting distance (cm)

Step size (cm)

ending distance (cm)

 Left/right parotid

CTV_ALL

− 1.0

0.2

1

 Brainstem

CTV_ALL

−1.0

0.2

1

 Spinal cord

CTV_ALL

0

0.2

2

 Left/right optic lens

CTV_ALL

0

0.4

4

 Left/right optic nerves

CTV_ALL

−1.0

0.3

2

 Pituitary

CTV_ALL

−1.0

0.3

2

 Optic chiasm

CTV_ALL

−1.0

0.3

2

 CTV1_P

GTV_T_P

−1.0

0.2

1

 CTV2_P

CTV1_P

−1.0

0.2

1

 CTV_NL_P

GTV_NL_P

−1.0

0.2

1

 CTV_NR_P

GTV_NR_P

−1.0

0.2

1

 Left parotid

GTV_NL_P

−1.0

0.3

2

 Right parotid

GTV_NR_P

−1.0

0.3

2

 Left/right parotid

GTV_T_P

0

0.3

3

 Pituitary

GTV_T_P

0

0.3

3

 Optic chiasm

GTV_T_P

0

0.3

3

TVH

Target volume

Starting distance (cm)

Step size (cm)

ending distance (cm)

 GTV_T_P

−1.0

0.2

1

 GTV_NL_P

−1.0

0.2

1

 GTV_NR_P

−1.0

0.2

1

 CTV1_P

−1.0

0.2

1

 CTV2_P

−1.0

0.2

1