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OAR
PRV
Imaging Delineation method
Spinal cord itself
Yes
CT
Manual/autosegmentation
Brainstem itself
Yes
CT/MR Manual/autosegmentation
Parotid/submandibular glands
No
CT/MR Manual/autosegmentation
Mandible
No
CT
Manual/autosegmentation
Retina, optic nerve, optic chiasm
Yes
CT/MR Manual
Lacrimal glands
No
CT/MR Manual
Brain/brain structures
No
CT/MR Manual/autosegmentation
Swallowing structures
No
CT
Manual
Thyroid gland
No
CT
Manual
Oral cavity
No
CT/MR Manual
Middle/inner ear
No
CT
Manual
Temporomandibular joint,
masseter & pterygoid muscles
No
CT
Manual
Brachial plexus
Yes?
CT/MR Manual
Cranial nerves
Yes?
CT/MR Manual
Lungs & trachea
No
CT
Manual/autosegmentation
Carotid arteries
No
CT
Manual/autosegmentation
PRV = Planning organ-at-Risk Volume
What are OARs?