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Table 1 Dose/volume constraints for OARs in IMRT and IMPT plans

From: Intensity-modulated radiotherapy of nasopharyngeal carcinoma: a comparative treatment planning study of photons and protons

Volume

Dose (GyE)

Spinal cord

Dmax ≤ 50 GyE

Brainstem

Dmax ≤ 60 GyE

Temporal lobes

Dmax ≤ 65 GyE

TM joints

Dmax ≤ 60 GyE

Optic chiasm & nerve

Dmax ≤ 54 GyE

Eyes

Dmax ≤ 25 GyE

Inner ears

Dmean < 45 GyE

Mid-external ears

Dmean < 40 GyE

Larynx-esophagus

Dmean < 30 GyE

Thyroid gland

Dmean < 30 GyE

Parotid glands (single gland)

Dmean < 26 GyE

Pituitary gland

as low as possible

Oral cavity

as low as possible

  1. GyE = cobalt Gray equivalent, TM = temporomandibular. Dmax is the absolute maximal dose in a single voxel.
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Radiation Oncology

ISSN: 1748-717X

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