Basic study on computed tomography (CT) of temporal bone.

概要

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The morphology of macrosections of the normal adult temporal bone were correlated with high resolution computed tomographic findings of 6 axial, coronal and sagittal sections.1) The micro-structure of the temporal bone was almost perfectly demonstrated by axial, coronal and sagittal sections. Axial sections provided more information on the structure of the temporal bone than did coronal sections. Sagittal sections gave little information.2) Axial sections effectively demonstrated the facial nerve canal (labyrinthine segment-geniculate ganglion-tympanic segment), majorr petrous nerve canal, short process of the incus, stapes (especially foot plate), and relationship of the malleus head to the incus body.3) Coronal sections were useful in demonstrating the cochlear aqueduct, facial nerve canal (mastoid segment), crista transverse, tensor tympani and ossicle (incus body, incus long process, stapes head, stapes crus).4) Sagittal sections were useful in demonstrating, the facial nerve canal (tympanic segment, mastoid segment), vestibular aqueduct, and the relationship of the malleus head to the incus long process.5) To understand the complicated structure of the temporal bone it was necessary to perform CT in many dimensions. The most useful section was the axial. Coronal and sagittal sections were sometimes useful.