Fast Helical Tomotherapy in a head and neck cancer planning study: is time priceless?

Radiation Oncology

Table 2 Dose-volume constraints for PTVs and organs at risk

Target/Organ at risk	Median absorbed dose or D50 %	Mean absorbed dose	ALARA	D_near-min or D98 %	D_near-max or D2 %
PTV_56Gy	56 Gy		V59.9 Gy	≥95 % of planned absorbed dose
PTV_69Gy	69.12 Gy			≥95 % of planned absorbed dose	≤107 % of planned absorbed dose
PRV Spinal cord			D2		≤50 Gy
PRV Brainstem	≤55 Gy		D2		≤59 Gy
Parotid gland contralateral		≤23 Gy	Mean D, V27
Parotid gland ipsilateral		≤27 Gy	Mean D, V27
Submandibular gland		≤39 Gy	Mean D
Oral mucosa		≤27 Gy	Mean D, V27
Mandible			V60
Soft palate		≤27 Gy	Mean D, V27
Constrictor muscles		≤55 Gy	Mean D, V20
Cricopharyngeal muscle		≤55 Gy	Mean D, V20
Base of tongue		≤55 Gy	Mean D, V20
Larynx		≤40 Gy	Mean D, V40
Esophagus superior		≤35 Gy	Mean D, V35
Top of lung			V20
Inner ear			Mean D, V45

Abbreviations: PTV planning target volume, PRV planning risk volume, D dose, V volume, ALARA as low as reasonable achievable

ISSN: 1748-717X