Helical tomotherapy for duodenal adenocarcinoma in an elderly patient: A case report

Table 1 Planning target volume coverage

	HT PTV
D90%	49.27 Gy
D95%	48.76 Gy
D50%	50.61 Gy
D2%	51.5 Gy
V107	0 Gy
HI	0.96

HT: Helical tomotherapy; PTV: Planning target volume; HI: Homogeneity index; Gy: Gray.

Table 2 Organs at risk dosimetry for helical tomotherapy

	Constraints	HT
Right kidney
V12 Gy	< 55%	5.6%
V20 Gy	< 32%	1.3%
V23 Gy	< 30%	0.7%
V28 Gy	< 20%	0.2%
Dmean	15-18 Gy	6.10 Gy
Left kidney
V12 Gy	< 55%	22%
V20 Gy	< 32%	0%
V23 Gy	< 30%	0%
V28 Gy	< 20%	0%
Dmean	15-18 Gy	8.9 Gy
Liver
V30 Gy	< 30%	0%
Dmean	< 28 Gy	5.32 Gy

HT: Helical tomotherapy; Dmean: Mean dose; Gy: Gray.