Image quality and dose assessment in inner ear computed tomography imaging with a flat panel-based system

Area of Science:

• Medical Imaging
• Radiology
• Biomedical Engineering

Background:

• The temporal bone contains critical structures, some less than 1 mm in size.
• Accurate imaging is essential for surgical guidance in this region.

Purpose of the Study:

• To assess the feasibility of a novel computed tomography (CT) system.
• To achieve high-resolution 3D imaging of the inner ear.
• To utilize low radiation doses for patient safety.

Main Methods:

• A laboratory prototype CT system was developed using a CMOS Hamamatsu detector.
• Tomographic tests were performed on two dedicated phantoms.

Main Results:

• The system achieved a 150-μm spatial resolution (5% MTF) with an 88-μm voxel size.
• Acceptable contrast was obtained.
• Estimated effective dose was 1/20 to 1/100 of standard head CT.

Conclusions:

• The developed tomographic system is suitable for inner ear imaging.
• The prototype demonstrates excellent characteristics for detailed anatomical visualization.
• The system's low radiation dose is a significant advantage.