Patterns of Mongolian oak knot distribution Our results show that external features can be used to assess the wood quality of Mongolian oak in a detailed manner by leveraging the correlation between scar seal and knot. CT technology was used to non-destructively determine the number of Mongolian oak knots. Scanning a 1-meter log took 2 min, which is much more time-saving compared to destructive methods. The manual validation measurements of scars parameters were time-consuming.