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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