A comparison of computer-aided surgery registration methods for endoscopic sinus surgery.

Area of Science:

• Neurosurgery
• Medical Imaging
• Surgical Navigation

Background:

• Computer-aided stereotactic surgery enhances surgeon navigation in complex sinus anatomy.
• Accurate registration is critical for the success of image-guided surgery.
• This study evaluates three registration techniques: fiducial, anatomic landmarks, and surface registration.

Purpose of the Study:

• To compare the accuracy and performance of fiducial, landmark, and surface registration methods in stereotactic computer-aided surgery.
• To determine the most efficient and accurate registration method for sinus surgery navigation.

Main Methods:

• Ten cadaveric heads underwent CT scans and endoscopic procedures.
• Fiducial, landmark, and surface registration methods were applied to each specimen.
• Registration time and mean error were recorded; accuracy was assessed by comparing identified anatomic sites with preoperative CT images.

Main Results:

• Surface registration was the fastest (1 min 1 sec ± 5 sec), followed by fiducial (5 min 24 sec ± 27 sec), and landmark (11 min 46 sec ± 45 sec).
• Fiducial registration showed the lowest mean error (0.48 ± 0.21 mm), followed by surface (1.05 ± 0.06 mm) and landmark (3.1 ± 0.25 mm).
• Fiducial and surface registration were similarly accurate and superior to landmark registration; surface registration was more accurate than landmark registration at most sites.

Conclusions:

• Fiducial and surface registration methods demonstrate comparable accuracy, both significantly outperforming landmark registration in cadaveric specimens.
• Surface registration is considered superior when accounting for registration time, accuracy, and overall ease of use in image-guided sinus surgery.