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 |