| Abstract [eng] |
Relevance of problem: A mixed reality device has the capability to utilize patient-specific data acquired from computer tomography (CT) and magnetic resonance imaging (MRI) scans to display holographic images. These devices are becoming increasingly popular in various clinical practices as they enhance the effectiveness of treatment. Real-time visualization of anatomy, surgical plans, and other relevant information would be advantageous in numerous clinical procedures. However, it's crucial to ensure the accuracy of holographic projections for this technology to be truly beneficial. The aim of the problem: Evaluate the accuracy of holographic image projections onto a dental model using different trackers. Materials and methods: An application has been developed for the ‘‘HoloLens 2,, device that allows users to see holograms in a specific location in real time. The main goal is to ensure that the hologram matches the real-world environment accurately. To improve precision, an ,,L’’- shaped tracker with contrasting stickers was produced and compared to the ,,Navident’’ dynamic navigation tracker. For calibration purposes, a pen with a cube containing contrasting stickers was created. A study was conducted to assess the accuracy of hologram projection during calibration. Results: The average angle between the positions of the marked points during calibration and the fixed points' positions in the hologram value using the "Navident" tracker is 5.06 degrees higher than using the "L" shaped tracker. Both average angle values are statistically significant (p=0.041). All distances between the points are statistically significant (p<0.05). The average values of pen oscillation were evaluated in four-point positions during the calibration: the most accurate point average (0.57 mm) with the smallest standard deviation (SD) (0.44 mm) was achieved using the "L" shaped tracker, while the fourth point achieved the highest point precision average (2.15 mm) and SD (7.67 mm) using the "Navident" tracker. With the "Navident" tracker, distances at each point are greater than those of the "L" shaped tracker. Conclusion: A holographic image is more stable when using a tracker that is angled and covered with a distinctive, non-repeating geometric pattern in contrasting colours. Calibration is also an important procedure for the accuracy of the holographic image's position on the real object. Additionally, the angle between the positions of the marked points during calibration and the fixed points' positions in the planes of hologram (virtual dental model) is significant for accuracy. |
