Clinically relevant human temporal bone measurements using novel high-resolution cone-beam CT

Area of Science:

• Medical Imaging
• Otolaryngology
• Anatomy

Background:

• Accurate imaging of fine temporal bone structures is crucial for diagnosing inner ear diseases and planning surgeries.
• Conventional imaging methods may have limitations in visualizing delicate anatomical details.

Purpose of the Study:

• To evaluate the feasibility of using a novel, high-resolution cone-beam computed tomography (CBCT) system for measuring intricate temporal bone structures.
• To assess the system's capability in visualizing key anatomical landmarks within the temporal bone.

Main Methods:

• Six formalin-fixed human cadaver temporal bones were imaged using a high-resolution CBCT system with 900 frames and copper + aluminum filtration.
• Measurements of fine temporal bone structures, including the facial nerve canal and vestibular structures, were performed.

Main Results:

• The CBCT system clearly demonstrated middle ear structures (tympanic membrane, tensor tympani tendon, cochleariform process, pyramidal eminence, stapes footplate).
• Detailed visualization of the full path of the facial nerve, supralabyrinthine space, semicircular canals, subarcuate canal, and vestibular aqueduct was achieved.
• Quantitative data included vestibular aqueduct width (0.4 ± 0.0 mm midpoint, 0.5 ± 0.1 mm opercular), internal acoustic meatus length (10.6 ± 1.2 mm), and diameter (3.7 ± 0.3 mm).

Conclusions:

• The novel high-resolution CBCT system is feasible for measuring fine temporal bone structures.
• This technology has potential applications in diagnosing inner ear diseases, monitoring pathological changes, surgical planning, and ear surgery navigation.
• The system offers valuable training opportunities for temporal bone anatomy and surgery.