TABLE 1.

Comparison between treatment plans using ${\mathrm{IVDT}}_{\mathrm{MVCT}}^{\mathrm{outair}}$ and ${\mathrm{IVDT}}_{\mathrm{MVCT}}^{\mathrm{inair}}$

HN radiotherapy		MVCT—adaptive dose (Gy)
Name		${\mathrm{IVDT}}_{\mathrm{MVCT}}^{\mathrm{inair}}$	${\mathrm{IVDT}}_{\mathrm{MVCT}}^{\mathrm{outair}}$	ΔDα (%)
PTV1	D 98%	71.4	71.0	0.6
	D 50%	74.7	74.3	0.5
	D 2%	76.2	75.8	0.5
PTV2	D 98%	53.2	52.9	0.6
	D 50%	54.6	54.2	0.7
	D 2%	55.1	54.4	1.2
Spinal cord	D max	42.3	42.0	0.7
Parotid_R	D max	55.0	54.8	0.5
	D mean	28.1	28.0	0.5
Parotid_L	D max	70.6	70.2	0.6
	D mean	36.1	35.8	0.6

Abbreviations: D _x%, dose received by ≥x% volume; HN, head and neck; MVCT, megavoltage computed tomography$;$PTV, planning target volume.