Head & Neck Oncology

Table 4 Planned Target Volume (PTV) Data.

From: Dosimetric impact of target definitions on normal structures in head and neck cancer

	RTOG	3Dose	p
Volumes (cc)
PTV-HD	293.6	111.6	<0.001
PTV-ED	704.8	545.2	<0.001
PTV Total	998.4	837.3	<0.001
Doses
PTV-ED heterogeneity (%)
110%	36.549	14.870	0.002
115%	15.086	2.716	<0.001
93% Target Coverage (%)
PTV-HD	99.823	99.994	0.049
PTV-ED	99.449	99.705	0.06
Mean Target Doses (cGy)
PTV-HD	7357.63	7240.90	0.01
PTV-ED	6099.57	5935.40	0.001
PTV Total	6468.31	6281.12	<0.001
Mean MUs	1675	1556	0.01

Abbreviations: RTOG = two dose level plan; 3Dose = three dose level plan; PTV-HD = high dose PTV; PTV-ED = elective dose PTV; PTV Total = sum of PTV-HD, PTV-ED, and PTV-ID; MUs = monitor units

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