CBCT is a fast imaging technique with a substantially lower radiation dosage than conventional MDCT for sinus imaging. Surgical navigation systems are increasingly being used in endoscopic sinus and skull base surgery, reducing perioperative morbidity.

Researchers did this study to investigate CBCT as a low-radiation imaging modality for use in surgical navigation.

The required field of view was measured from the nose’s tip to the posterior clinoid process anteroposteriorly. The nasolabial angle to the frontal sinus’s roof superoinferiorly on 50 consecutive MDCT scans. A phantom head was manufactured by 3-dimensional printing and imaged using 3 CBCT scanners, a conventional MDCT scanner, and a highly accurate laser scanner. The phantom head was registered to 3 surgical navigation systems using scans from each course.

The required field of view was measured as 107 ± 7.6 mm anteroposteriorly and 90.3 ± 9.6 mm superoinferiorly. Image error deviations from the laser scan were comparable for MDCT and CBCT scanners. Fiducial registration error and target registration error were also similar for MDCT- and CBCT-based navigation.

The study concluded that CBCT is a low-radiation preoperative imaging modality suitable for use in surgical navigation.

Reference: https://journals.sagepub.com/doi/full/10.1177/1945892419861849