Table 1.

Guidelines for regions of interest (ROIs) segmentation.

ROI	Segmentation boundaries
Posterior cranial fossa	Anteriorly: clivus and petrous part of temporal bone
	Posterio-laterally: occipital bone
	Superiorly: tentorium cerebelli or first image acquisition when at lower level
	Inferiorly: foramen magnum
Oral cavity	Anteriorly: mucosa of upper and lower lips
	Posteriorly: level of palatoglossal folds (Ant. Pillars)
	Laterally: mucosa of the cheek
	Superiorly: hard palate
	Inferiorly: mucosa of the floor of mouth
Floor of mouth	Antero-laterally: mandible
	Posteriorly: posterior border of suprahyoid musculature
	Superiorly: mucosa of the floor of mouth
	Inferiorly: skin of the chin
Oropharynx	Anteriorly: level of palatoglossal folds (Ant. Pillars)
	Posterio-laterally: pharyngeal constrictors
	Superiorly: soft palate
	Inferiorly: upper surface of epiglottis
Larynx	Anteriorly: anterior border of thyroid cartilage
	Posterio-laterally: pharyngeal constrictors
	Superiorly: lower surface of epiglottis
	Inferiorly: lower border of cricoid cartilage
Right and left neck	Anteriorly: submandibular gland
	Posteriorly: posterior edge of sternomastoid muscle
	Medially: medial edge of carotids
	Laterally: skin of the neck
	Superiorly: lower edge of the lateral process of C1
	Inferiorly: lower border of cricoid cartilage