Table 4.

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

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