Table 1:

Synopsis of the 23 anatomic structures reviewed and the respective primary criteria for image quality assessment

Structure/Condition	Review Criteria
Cochlea	Normal contour, 2.5 turns
Cochlear patency	Ability to discern intracochlear ossifications
Spiral osseous lamina	Presence, integrity
Modiolus	Presence, integrity
Labyrinth	Contour, density
Vestibular aqueduct	Contour, density
Cochlear aqueduct	Contour, density
Cochlear nerve canal	Presence
Bony lamella at auditory canal fundus	Presence, integrity of bony lamella separating the internal auditory canal from the cochlea
Internal auditory canal	Contour
Facial nerve canal, cochlear segment	Contour, course
Facial nerve canal, tympanic segment	Contour, course
Facial nerve canal, mastoid segment	Contour, course
Middle ear cavity	Aeration
Malleus	Presence of all parts
Incus	Presence of all parts
Stapes	Presence of all parts
Round window	Presence, aperture
Round window niche	Borders, aeration
Oval window	Presence, borders, footplate position
Internal carotid artery canal	Borders, osseous wall dehiscence
Jugular foramen	Borders, osseous wall dehiscence
Mastoid	Bony borders, aeration