Analysis of HRCT and 3D simulation images of accessory maxillary sinus ostia in superior meatus
HRCT images were acquired using a computed tomography scanner (GE Brightspeed S, Boston, Massachusetts, United States) with a resolution of 512 × 512 matrix size. Data were reconstructed with slices of 2.5 mm thickness and the inter-space was 2.5 mm. The images were analysed by the same software (Advantage workstation 4.4 Navigation, Wisconsin, United States). All HRCT images were evaluated by one examiner and 3D simulation images were all reconstructed by one radiologist without any patient identifiers.
In the HRCT scans and confirmed 3D-reconstructed images, bilateral maxillary sinus was assessed. An accessory maxillary sinus ostium in superior meatus was recorded as either 1) radiologically absent or 2) radiologically present.